1
|
Nsuala BN, Enslin G, Weiyang C, Veale C, Viljoen A. Chemical profiling, anticonvulsant and anxiolytic effects of the smoke constituents isolated from Leonotis leonurus (L.) R.Br. J Ethnopharmacol 2024:118271. [PMID: 38688356 DOI: 10.1016/j.jep.2024.118271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Revised: 04/26/2024] [Accepted: 04/27/2024] [Indexed: 05/02/2024]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The use of medicinal plants for central nervous system (CNS)-related ailments, such as epilepsy and anxiety, is prevalent in South Africa. Plants from the Lamiaceae family are commonly used for their therapeutic benefits. Leonotis leonurus (L.) R.Br. has been reported in ethnobotanical literature to have anticonvulsant and anxiolytic effects through the inhalation of pyrolysis products obtained by combustion of the aerial parts. AIM AND OBJECTIVES To explore the chemical profiles and CNS activity of the smoke extract and isolated constituents of L. leonurus in zebrafish larvae, through anticonvulsive and anxiolytic activity assays. MATERIALS AND METHODS The smoke extract of L. leonurus was obtained through the combustion of the aerial parts of the plant using a custom-built smoke recovery apparatus. The chemical profile of the smoke constituents was determined using the Ultra-Performance Liquid Chromatography coupled with Mass Spectrometry (UPLC-MS). Targeted compounds were subjected to preparative High-Performance Liquid Chromatography for separation before structure elucidation using Nuclear Magnetic Resonance (NMR). The maximum tolerated concentrations, as well as the anxiolytic activity of the smoke extract were determined in five days post fertilisation zebrafish larvae. Reverse-thigmotaxis and locomotor activity of larvae in the light/dark transition assay were used to determine anxiolytic activity. Zebrafish larvae at six days post fertilisation were subjected to several concentrations of the smoke constituents of L. leonurus. The baseline locomotor activity of the larvae was tracked for 30 min, prior to addition of pentylenetetrazole (PTZ) to induce seizure-like behaviour in the larvae, after which the locomotor activity of the larvae was once again tracked for an additional 30 min. RESULTS and Discussion: The UPLC-MS profiles of the smoke extract revealed the presence of two main compounds, leoleorin A and leoleorin B, which were targeted and isolated. Upon subjection to NMR spectroscopy for structure elucidation, the compounds were confirmed to be labdane diterpenoids. Both leoleorin A and leoleorin B, and the smoke extract displayed suppression of the PTZ induced seizure-like behaviour in six days post fertilisation (dpf) in zebrafish larvae. Under light and dark conditions, the smoke extract and compounds displayed potential anxiolytic activity at different concentrations. CONCLUSION Our results suggest that the smoke constituents of L. leonurus may exert anticonvulsant and anxiolytic effects which align with the traditional indications and the mode of administration.
Collapse
Affiliation(s)
- Baudry N Nsuala
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001
| | - Gill Enslin
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001
| | - Chen Weiyang
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001
| | - Clint Veale
- Department of Chemistry, University of Cape Town, Private Bag X3, Rondebosch, 7701
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001; SAMRC Herbal Drugs Research Unit, Tshwane University of Technology, Private Bag X680, Pretoria, 0001.
| |
Collapse
|
2
|
Haasbroek-Pheiffer A, Viljoen A, Steenekamp J, Chen W, Hamman J. An Ex vivo Investigation on Drug Permeability of Sheep Nasal Epithelial Tissue Membranes from the Respiratory and Olfactory Regions. Curr Drug Deliv 2024; 21:115-125. [PMID: 36518033 DOI: 10.2174/1567201820666221214105836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 10/28/2022] [Accepted: 11/03/2022] [Indexed: 12/15/2022]
Abstract
BACKGROUND Besides systemic drug delivery, the intranasal route of administration has shown potential for direct nose-to-brain drug delivery, which has gained popularity because it bypasses the blood-brain barrier. OBJECTIVE The region in the nose from which the epithelial tissue membrane is excised to conduct ex vivo permeation studies for nasal drug delivery studies may be of importance, but the permeability of the epithelium from the different nasal regions has not yet been investigated in the sheep model. METHODS The permeation of five selected model compounds (i.e., atenolol, caffeine, Rhodamine 123, FITC-dextran, and Lucifer Yellow) was measured across epithelial tissues that were excised from two different areas of the sheep nasal cavity, namely the ventral nasal concha (representing respiratory epithelium) and the ethmoid nasal concha (representing olfactory epithelium). RESULTS Although the selected compounds' permeation was generally slightly higher across the olfactory epithelial tissues than across the respiratory epithelial tissues, it was not statistically significant except in the case of atenolol. CONCLUSION The presence of olfactory nerves and supporting cells and the gaps between them in the olfactory epithelial tissues may have contributed to the higher permeation of atenolol, but this needs to be further investigated to elucidate the precise mechanism.
Collapse
Affiliation(s)
- Anja Haasbroek-Pheiffer
- Centre of Excellence for Pharmaceutical Sciences (Pharmacen™), Faculty of Health Sciences, North-West University, Potchefstroom-2520, South Africa
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria-0001, South Africa
- SAMRC Herbal Drugs Research Unit, Tshwane University of Technology, Pretoria-0001, South Africa
| | - Jan Steenekamp
- Centre of Excellence for Pharmaceutical Sciences (Pharmacen™), Faculty of Health Sciences, North-West University, Potchefstroom-2520, South Africa
| | - Weiyang Chen
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria-0001, South Africa
| | - Josias Hamman
- Centre of Excellence for Pharmaceutical Sciences (Pharmacen™), Faculty of Health Sciences, North-West University, Potchefstroom-2520, South Africa
| |
Collapse
|
3
|
Schripsema J, Augustyn W, Viljoen A. Characterisation of Sclerocarya birrea (marula) seed oil and investigation of the geographical origin by applying similarity calculations, differential NMR and hierarchical cluster analysis. Phytochem Anal 2023; 34:959-969. [PMID: 37515510 DOI: 10.1002/pca.3264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 06/27/2023] [Accepted: 06/29/2023] [Indexed: 07/31/2023]
Abstract
INTRODUCTION The marula fruit is an important indigenous African fruit since various commercial products are produced from the pulp and the seed oil. The increased demand requires methods for authentication, quality control and determination of geographical origin. OBJECTIVE The study aimed to establish a fast and reliable method for characterisation and authentication of marula seed oil. Furthermore, to identify marker compounds that can distinguish marula seed oils from other commercial oils and indicate regional differences. MATERIALS AND METHODS Metabolic profiling of 44 commercial marula seed oils was performed using proton nuclear magnetic resonance (1 H NMR). For rapid classification similarity calculations were compared with principal component analysis. Differential NMR was used to determine marker compounds. RESULTS Marula seed oil was found to be similar to macadamia and olive oils and was distinguished from these oils by the detection of minor components. Marula seed oil is differentiated from the other two oils by the absence of α-linolenic acid, relatively high levels of monoglycerides and diglycerides, and an approximately 1:1 ratio of 1,2- and 1,3-diglycerides. When comparing marula seed oils from various regions using hierarchical cluster analysis, clustering of the marula seed oils from Namibia and Zimbabwe was observed and was related to the quantities of linoleic acid and monoglycerides and diglycerides. Some samples displayed deviations in their composition which might indicate adulteration or contamination during the production process. CONCLUSION The study demonstrates the potential of NMR as a tool in the quality control of marula seed oil. This technique requires very little sample preparation, circumvents derivatisation of the oil components with fast run-times. In addition, samples with chemical profiles that differ from the general signature profile can easily be identified.
Collapse
Affiliation(s)
- Jan Schripsema
- Grupo Metabolômica, Laboratório de Ciências Quimicas, Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, Brazil
| | - Wilma Augustyn
- Department of Chemistry, Tshwane University of Technology, Pretoria, South Africa
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Pretoria, South Africa
- SAMRC Herbal Drugs Research Unit, Tshwane University of Technology, Pretoria, South Africa
| |
Collapse
|
4
|
Haasbroek-Pheiffer A, Viljoen A, Steenekamp J, Chen W, Hamman J. Permeation of Phytochemicals of Selected Psychoactive Medicinal Plants across Excised Sheep Respiratory and Olfactory Epithelial Tissues. Pharmaceutics 2023; 15:pharmaceutics15051423. [PMID: 37242666 DOI: 10.3390/pharmaceutics15051423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 04/26/2023] [Accepted: 05/01/2023] [Indexed: 05/28/2023] Open
Abstract
The intranasal route of drug administration offers an opportunity to bypass the blood-brain barrier and deliver compounds directly into the brain. Scientific evidence exists for medicinal plants (e.g., Centella asiatica and Mesembryanthemum tortuosum) to treat central nervous system conditions such as anxiety and depression. The ex vivo permeation of selected phytochemicals (i.e., asiaticoside and mesembrine) has been measured across excised sheep nasal respiratory and olfactory tissue. Permeation studies were conducted on individual phytochemicals and C. asiatica and M. tortuosum crude extracts. Asiaticoside exhibited statistically significantly higher permeation across both tissues when applied alone as compared to the C. asiatica crude extract, while mesembrine permeation was similar when applied alone or as M. tortuosum crude extract. Permeation of all the phytocompounds was similar or slightly higher than that of the drug atenolol across the respiratory tissue. Permeation of all the phytocompounds was similar to or slightly lower than that of atenolol across the olfactory tissue. In general, the permeation was higher across the olfactory epithelial tissue than across the respiratory epithelial tissue and therefore showed potential for direct nose-to-brain delivery of the selected psychoactive phytochemicals.
Collapse
Affiliation(s)
- Anja Haasbroek-Pheiffer
- Centre of Excellence for Pharmaceutical Sciences (Pharmacen™), Faculty of Health Sciences, North-West University, Potchefstroom 2520, South Africa
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
- SAMRC Herbal Drugs Research Unit, Tshwane University of Technology, Pretoria 0001, South Africa
| | - Jan Steenekamp
- Centre of Excellence for Pharmaceutical Sciences (Pharmacen™), Faculty of Health Sciences, North-West University, Potchefstroom 2520, South Africa
| | - Weiyang Chen
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
| | - Josias Hamman
- SAMRC Herbal Drugs Research Unit, Tshwane University of Technology, Pretoria 0001, South Africa
| |
Collapse
|
5
|
Viljoen A, Oosthuizen MK. Dim light at night affects the locomotor activity of nocturnal African pygmy mice ( Mus minutoides) in an intensity-dependent manner. Proc Biol Sci 2023; 290:20230526. [PMID: 37072046 PMCID: PMC10113032 DOI: 10.1098/rspb.2023.0526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Accepted: 03/27/2023] [Indexed: 04/20/2023] Open
Abstract
Rodents are integral components of ecosystems as they provide several important ecosystem services. Despite their importance as prey, pollinators and seed distributors, African rodents are largely understudied. The effect of anthropogenic changes such as artificial light at night extends past urban areas to peri-urban and rural habitats, and can have profound effects on entire ecosystems. We investigated the effect of dim light at night (dLAN) on the locomotor activity rhythms of the African pygmy mouse (Mus minutoides). Pygmy mice showed a dramatic, intensity-dependent reduction in their locomotor activity when subjected to dLAN, which was accompanied by a delay in the activity onset. We also considered masking responses with a dark pulse (DP) during the day and a light pulse at night. All animals became inactive in response to a light pulse during the night, whereas approximately half of the animals showed activity during a DP in the day. Our results suggest that the African pygmy mouse is highly sensitive to light and that their activity is strongly masked by light. In their natural environment, vegetation could shield pygmy mice against high light levels; however, other anthropogenic disturbances can alter the behaviour of these animals and could affect their survival.
Collapse
Affiliation(s)
- A. Viljoen
- Department of Zoology and Entomology, University of Pretoria, Pretoria 0002, South Africa
| | - M. K. Oosthuizen
- Department of Zoology and Entomology, University of Pretoria, Pretoria 0002, South Africa
- Mammal Research Institute, University of Pretoria, Pretoria 0002, South Africa
| |
Collapse
|
6
|
Rubegeta E, Makolo F, Kamatou G, Enslin G, Chaudhary S, Sandasi M, Cunningham AB, Viljoen A. The African cherry: A review of the botany, traditional uses, phytochemistry, and biological activities of Prunus africana (Hook.f.) Kalkman. J Ethnopharmacol 2023; 305:116004. [PMID: 36535336 DOI: 10.1016/j.jep.2022.116004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 11/28/2022] [Accepted: 11/29/2022] [Indexed: 06/17/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Prunus africana (Hook.f.) Kalkman (Rosaceae), commonly known as "Pygeum" or "African cherry", occurs in mainland montane forests scattered across sub-Saharan Africa, Madagascar, and some surrounding islands. Traditionally, decoctions of the stem-bark are taken orally for the treatment of a wide variety of conditions, such as benign prostatic hyperplasia (BPH), stomach ache, chest pain, malaria, heart conditions, and gonorrhoea, as well as urinary and kidney diseases. The timber is used to make axe handles and for other household needs. The dense wood is also sawn for timber. AIM The fragmented information available on the ethnobotany, phytochemistry, and biological activities of the medicinally important P. africana was collated, organised, and analysed in this review, to highlight knowledge voids that can be addressed through future research. MATERIALS AND METHODS A bibliometric analysis of research output on P. africana was conducted on literature retrieved, using the Scopus® database. The trend in the publications over time was assessed and a network analysis of collaborations between countries and authors was carried out. Furthermore, a detailed review of the literature over the period 1971 to 2021, acquired through Scopus, ScienceDirect, SciFinder, Pubmed, Scirp, DOAJ and Google Scholar, was conducted. All relevant abstracts, full-text articles and various book chapters on the botanical and ethnopharmacological aspects of P. africana, written in English and German, were consulted. RESULTS A total of 455 documents published from 1971 to 2021, were retrieved using the Scopus search. Analysis of the data showed that the majority of these documents were original research articles, followed by reviews and lastly a miscellaneous group comprising conference papers, book chapters, short surveys, editorials and letters. Data were analysed for annual output and areas of intense research focus, and countries with high research output, productive institutions and authors, and collaborative networks were identified. Prunus africana is reported to exhibit anti-inflammatory, analgesic, antimicrobial, anti-oxidant, antiviral, antimutagenic, anti-asthmatic, anti-androgenic, antiproliferative and apoptotic activities amongst others. Phytosterols and other secondary metabolites such as phenols, triterpenes, fatty acids, and linear alcohols have been the focus of phytochemical investigations. The biological activity has largely been ascribed to the phytosterols (mainly 3-β-sitosterol, 3-β-sitostenone, and 3-β-sitosterol-glucoside), which inhibit the production of prostaglandins in the prostate, thereby suppressing the inflammatory symptoms associated with BPH and chronic prostatitis. CONCLUSIONS Many of the ethnobotanical assertions for the biological activity of P. africana have been confirmed through in vitro and in vivo studies. However, a disparity exists between the biological activity of the whole extract and that of single compounds isolated from the extract, which were reported to be less effective. This finding suggests that a different approach to biological activity studies should be encouraged that takes all secondary metabolites present into consideration. A robust technique, such as multivariate biochemometric data analysis, which allows for a holistic intervention to study the biological activity of a species is suggested. Furthermore, there is a need to develop rapid and efficient quality control methods for both raw materials and products to replace the time-consuming and laborious methods currently in use.
Collapse
Affiliation(s)
- Emmanuel Rubegeta
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - Felix Makolo
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - Guy Kamatou
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - Gill Enslin
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - Sushil Chaudhary
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - Maxleene Sandasi
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa; SAMRC Herbal Drugs Unit, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - Anthony B Cunningham
- School of Life Sciences, University of KwaZulu-Natal, Private Bag X54001, Pietermaritzburg, 3200, South Africa
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa; SAMRC Herbal Drugs Unit, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa.
| |
Collapse
|
7
|
Rapper SLD, Viljoen A, van Vuuren S. Optimizing the Antimicrobial Synergism of Melaleuca alternifolia (Tea Tree) Essential Oil Combinations for Application against Respiratory Related Pathogens. Planta Med 2023; 89:454-463. [PMID: 36626923 DOI: 10.1055/a-1947-5680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Antimicrobial research into the use of Melaleuca alternifolia essential oil has demonstrated broad-spectrum activity; however, much of the research published focuses on identifying the potential of this essential oil individually, rather than in combination for an enhanced antimicrobial effect. This study aimed to determine the antimicrobial activity of four essential oil combinations, all inclusive of M. alternifolia, against nine pathogens associated with the respiratory tract. The minimum inhibitory concentration assay was used to determine the antimicrobial activity of four essential oil combinations, M. alternifolia in combination with Cupressus sempervirens, Origanum majorana, Myrtus communis, and Origanum vulgare essential oils. The interactions between essential oil combinations were analyzed using isobolograms and SynergyFinder 2.0 software to visualize the synergistic potential at varied ratios. The antimicrobial activity of the different combinations of essential oils all demonstrated the ability to produce an enhanced antimicrobial effect compared to the essential oils when investigated independently. The findings of this study determined that isobolograms provide a more in-depth analysis of an essential oil combination interaction; however, the value of that interaction should be further quantified using computational modelling such as SynergyFinder. This study further supports the need for more studies where varied ratios of essential oils are investigated for antimicrobial potential.
Collapse
Affiliation(s)
- Stephanie Leigh-de Rapper
- Department of Pharmacy and Pharmacology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Faculty of Sciences, Tshwane University of Technology, Pretoria, South Africa
- SAMRC Herbal Drugs Research Unit, Department of Pharmaceutical Sciences, Tshwane University of Technology, Pretoria, South Africa
| | - Sandy van Vuuren
- Department of Pharmacy and Pharmacology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| |
Collapse
|
8
|
Orchard A, Moosa T, Motala N, Kamatou G, Viljoen A, van Vuuren S. Commercially Available Viola odorata Oil, Chemical Variability and Antimicrobial Activity. Molecules 2023; 28:molecules28041676. [PMID: 36838663 PMCID: PMC9958603 DOI: 10.3390/molecules28041676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 01/31/2023] [Accepted: 02/04/2023] [Indexed: 02/12/2023] Open
Abstract
Viola odorata L. oil is frequently recommended in the aromatherapeutic literature for treating respiratory, urinary, and skin infections; however, antimicrobial evidence is lacking. In addition, in aromatherapy, combinations of essential oils are predominantly utilized with the goal of achieving therapeutic synergy, yet no studies investigating the interaction of essential oil combinations with V. odorata oil exists. This study thus aimed to address these gaps by investigating the antimicrobial activity of three Viola odorata oil samples, sourced from different suppliers, independently and in combination with 20 different commercial essential oils, against micro-organisms involved in respiratory, skin, and urinary tract infections associated with global resistance trends. These pathogens include several of the ESKAPE pathogens (Enterococcus faecium, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa and Enterobacter spp.) The chemical profile of the oils was determined using gas chromatography coupled with mass spectrometry. The minimum inhibitory concentrations (MIC) were determined using the broth micro-dilution method. The interactive profiles for the combinations were assessed by calculating the fractional inhibitory concentration index (ΣFIC). The main compounds varied across the three samples, and included phenethyl alcohol, isopropyl myristate, 2-nonynoic acid, methyl ester, α-terpineol, α-cetone, and benzyl acetate. The V. odorata oil samples displayed overall poor antimicrobial activity when tested alone; however, the antimicrobial activity of the combinations resulted in 55 synergistic interactions where the combination with Santalum austrocaledonicum resulted in the lowest MIC values as low as 0.13 mg/mL. The frequency of the synergistic interactions predominantly occurred against Klebsiella pneumoniae, Pseudomonas aeruginosa, Acinetobacter baumannii, and Enterococcus faecium with noteworthy MIC values ranging from 0.25-1.00 mg/mL. This study also reports on the variability of V. odorata oils sold commercially. While this warrants caution, the antimicrobial benefit in combination provides an impetus for further studies to investigate the therapeutic potential.
Collapse
Affiliation(s)
- Ané Orchard
- Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg 2193, South Africa
| | - Tasneem Moosa
- Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg 2193, South Africa
| | - Nabeelah Motala
- Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg 2193, South Africa
| | - Guy Kamatou
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
- SAMRC Herbal Drugs Research Unit, Department of Pharmaceutical Sciences, Private Bag X680, Pretoria 0001, South Africa
| | - Sandy van Vuuren
- Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg 2193, South Africa
- Correspondence:
| |
Collapse
|
9
|
Clarke A, Bodini S, Douglas L, Catapano A, De Luca L, Hollstein T, Payne J, Pirro M, Viljoen A, Vogt A, Horne R. A behavioural science research programme to understand the barriers to achieving recommended LDL cholesterol goals. Atherosclerosis 2022. [DOI: 10.1016/j.atherosclerosis.2022.06.758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
|
10
|
Lim Ah Tock M, Combrinck S, Kamatou G, Chen W, Van Vuuren S, Viljoen A. Antibacterial Screening, Biochemometric and Bioautographic Evaluation of the Non-Volatile Bioactive Components of Three Indigenous South African Salvia Species. Antibiotics (Basel) 2022; 11:antibiotics11070901. [PMID: 35884155 PMCID: PMC9312202 DOI: 10.3390/antibiotics11070901] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 06/29/2022] [Accepted: 06/29/2022] [Indexed: 01/25/2023] Open
Abstract
Salvia africana-lutea L., S. lanceolata L., and S. chamelaeagnea L. are used in South Africa as traditional medicines to treat infections. This paper describes an in-depth investigation into their antibacterial activities to identify bioactive compounds. Methanol extracts from 81 samples were screened against seven bacterial pathogens, using the microdilution assay. Biochemometric models were constructed using data derived from minimum inhibitory concentration (MIC) and ultra-performance liquid chromatography-mass spectrometry data. Active molecules in selected extracts were tentatively identified using high-performance thin layer chromatography (HPTLC), combined with bioautography, and finally, by analysis of active zone eluates by mass spectrometry (MS) via a dedicated interface. Salvia chamelaeagnea displayed notable activity towards all seven pathogens, and the activity, reflected by MICs, was superior to that of the other two species, as confirmed through ANOVA. Biochemometric models highlighted potentially bioactive compounds, including rosmanol methyl ether, epiisorosmanol methyl ether and carnosic acid. Bioautography assays revealed inhibition zones against A. baumannii, an increasingly multidrug-resistant pathogen. Mass spectral data of the eluted zones correlated to those revealed through biochemometric analysis. The study demonstrates the application of a biochemometric approach, bioautography, and direct MS analysis as useful tools for the rapid identification of bioactive constituents in plant extracts.
Collapse
Affiliation(s)
- Margaux Lim Ah Tock
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Pretoria 0001, South Africa; (M.L.A.T.); (S.C.); (G.K.); (W.C.)
| | - Sandra Combrinck
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Pretoria 0001, South Africa; (M.L.A.T.); (S.C.); (G.K.); (W.C.)
| | - Guy Kamatou
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Pretoria 0001, South Africa; (M.L.A.T.); (S.C.); (G.K.); (W.C.)
| | - Weiyang Chen
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Pretoria 0001, South Africa; (M.L.A.T.); (S.C.); (G.K.); (W.C.)
| | - Sandy Van Vuuren
- Department of Pharmacy and Pharmacology, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Johannesburg 2193, South Africa;
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Pretoria 0001, South Africa; (M.L.A.T.); (S.C.); (G.K.); (W.C.)
- SAMRC Herbal Drugs Research Unit, Faculty of Science, Tshwane University of Technology, Pretoria 0001, South Africa
- Correspondence:
| |
Collapse
|
11
|
Leigh-de Rapper S, Viljoen A, van Vuuren S. Essential Oil Blends: The Potential of Combined Use for Respiratory Tract Infections. Antibiotics (Basel) 2021; 10:antibiotics10121517. [PMID: 34943729 PMCID: PMC8698682 DOI: 10.3390/antibiotics10121517] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 12/03/2021] [Accepted: 12/07/2021] [Indexed: 11/29/2022] Open
Abstract
This study investigated the potential efficacy of 369 commercial essential oil combinations for antimicrobial, anti-toxic and anti-inflammatory activity with the aim of identifying synergy among essential oils commonly used in combination by aromatherapists for respiratory purposes. Essential oil combinations were assessed for their antimicrobial activities using a panel of Gram-positive, Gram-negative, and yeast strains associated with respiratory tract infections. The antimicrobial activity was measured by determining the minimal inhibitory concentration (MIC) of microbial growth. The fractional inhibitory concentration index (ΣFIC) was calculated to determine the antimicrobial interactions between the essential oils in the combination. The toxicity of the essential oil combinations was tested in vitro using the brine shrimp lethality assay, the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay on RAW 264.7 mouse macrophage cells and A549 lung cancer cell lines. In addition, an inflammatory response was evaluated measuring nitric oxide production. The essential oils, when in combination, demonstrated an increased antimicrobial effect, a reduction in toxicity and provided improved anti-inflammatory outcomes. Five distinct combinations [Cupressus sempervirens (cypress) in combination with Melaleuca alternifolia (tea tree), Hyssopus officinalis (hyssop) in combination with Rosmarinus officinalis (rosemary), Origanum marjorana (marjoram) in combination with M. alternifolia, Myrtus communis (myrtle) in combination with M. alternifolia and Origanum vulgare (origanum) in combination with M. alternifolia] were found to be the most promising, demonstrating antimicrobial activity, reduced cytotoxicity and improved anti-inflammatory effects. With the increased prevalence of respiratory tract infections and the growing antimicrobial resistance development associated with antimicrobial treatments, this study provides a promising complementary alternative for the appropriate use of a selection of essential oil combinations for use in the respiratory tract.
Collapse
Affiliation(s)
- Stephanie Leigh-de Rapper
- Department of Pharmacy and Pharmacology, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown 2193, South Africa;
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Faculty of Sciences, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa;
- SAMRC Herbal Drugs Research Unit, Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
| | - Sandy van Vuuren
- Department of Pharmacy and Pharmacology, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown 2193, South Africa;
- Correspondence:
| |
Collapse
|
12
|
Peterson B, Jacobsz C, Hamman J, Viljoen A, Steyn D. Pharmacokinetic interactions: The effects of selected herbal extracts on permeation of P-glycoprotein substrate drugs across excised pig intestinal tissue. J Herbmed Pharmacol 2021. [DOI: 10.34172/jhp.2022.14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Introduction: There is growing concern that co-administered herbal medicines may alter the pharmacokinetics and, therefore, the efficacy and toxicity of Western drugs. The aim of this study was to investigate the potential membrane permeation modulating effects of four herbal extracts, i.e., Harpagophytum procumbens, Hoodia gordonii, Leonotis leonurus, and Vitis vinifera on a model compound, Rhodamine 123 (RH-123). Methods: An in vitro permeation model, i.e., excised pig intestinal tissue, mounted to test chambers in a Sweetana-Grass diffusion apparatus, was used to measure the bi-directional transport of RH-123 in the presence and in the absence of four herbal extracts. The concentration of transported RH-123 in each sample was determined by means of fluorescence spectroscopic analysis. The integrity of the mounted jejunum tissue during experimentation was confirmed by measuring the permeation of Lucifer Yellow through these membranes. Trans-epithelial electrical resistance (TEER) of the mounted membranes was also measured at the onset and termination of each experiment to monitor whether tight junction modulation occurred. Results: H. procumbens extract increased the secretory transport of RH-123, indicative of the induction of P-glycoprotein (P-gp) mediated efflux. H. gordonii extract also increased RH-123’s absorptive transport, coupled with a subsequent decrease in its secretory transport, indicating the P-gp related efflux inhibition. Contrary, L. leonurus extract reduced RH-123’s absorptive transport, accompanied by an increase in its secretory transport. V. vinifera seed extract, however, increased both the absorptive and secretory transport of RH-123. A reduction in TEER was observed in the presence of V. vinifera extract, indicating the modulation of tight junction integrity. Conclusion: The ex vivo pharmacokinetics interactions recorded in the current study suggest that the co-administration of herbal medicines could alter the extent of membrane permeation of Western drugs.
Collapse
Affiliation(s)
- Bianca Peterson
- Centre of Excellence for Pharmaceutical Sciences (Pharmacen™), North-West University, Potchefstroom 2520, South Africa
| | - Corneli Jacobsz
- Centre of Excellence for Pharmaceutical Sciences (Pharmacen™), North-West University, Potchefstroom 2520, South Africa
| | - Josias Hamman
- Centre of Excellence for Pharmaceutical Sciences (Pharmacen™), North-West University, Potchefstroom 2520, South Africa
| | - Alvaro Viljoen
- Faculty of Science, Department of Pharmaceutical Sciences and SAMRC Herbal Drugs Research Unit, Tshwane University of Technology, Pretoria, South Africa
| | - Dewald Steyn
- Centre of Excellence for Pharmaceutical Sciences (Pharmacen™), North-West University, Potchefstroom 2520, South Africa
| |
Collapse
|
13
|
Semwal RB, Semwal DK, Combrinck S, Viljoen A. Emodin - A natural anthraquinone derivative with diverse pharmacological activities. Phytochemistry 2021; 190:112854. [PMID: 34311280 DOI: 10.1016/j.phytochem.2021.112854] [Citation(s) in RCA: 52] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 06/19/2021] [Accepted: 06/20/2021] [Indexed: 06/13/2023]
Abstract
Emodin (1,3,8-trihydroxy-6-methyl-anthraquinone) is a natural anthraquinone derivative that is present in numerous globally renowned herbal medicines. It is recognised as a protein tyrosine kinase inhibitor and as an anticancer drug, active against various tumour cells, including lung, breast, liver, and ovarian cancer cells. Recently, its role in combination chemotherapy with various allopathic medicines, to minimize their toxicity and to enhance their efficacy, has been studied. The use of emodin in these therapies is gaining popularity, due to fewer associated side effects compared with standard anticancer drugs. Emodin has a broad therapeutic window, and in addition to its antineoplastic activity, it displays anti-ulcer, anti-inflammatory, hepatoprotective, neuroprotective, antimicrobial, muscle relaxant, immunosuppressive and antifibrotic activities, in both in vitro and in vivo models. Although reviews on the anticancer activity of emodin have been published, none coherently unite all the pharmacological properties of emodin, particularly the anti-oxidant, antimicrobial, antidiabetic, immunosuppressive and hepatoprotective activities of the compound. Hence, in this review, all of the available data regarding the pharmacological properties of emodin are explored, with particular emphasis on the modes of action of the molecule. In addition, the manuscript details the occurrence, biosynthesis and chemical synthesis of the compound, as well as its toxic effects on biotic systems.
Collapse
Affiliation(s)
- Ruchi Badoni Semwal
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa; Department of Chemistry, Pt. Lalit Mohan Sharma Govt. Post Graduate College, Rishikesh, 249201, India
| | - Deepak Kumar Semwal
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa; Department of Phytochemistry, Faculty of Biomedical Sciences, Uttarakhand Ayurved University, Harrawala, Dehradun, 248001, India
| | - Sandra Combrinck
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa; SAMRC Herbal Drugs Research Unit, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa.
| |
Collapse
|
14
|
Ahmad A, Elisha IL, van Vuuren S, Viljoen A. Volatile phenolics: A comprehensive review of the anti-infective properties of an important class of essential oil constituents. Phytochemistry 2021; 190:112864. [PMID: 34311279 DOI: 10.1016/j.phytochem.2021.112864] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 06/23/2021] [Accepted: 06/28/2021] [Indexed: 06/13/2023]
Abstract
Historically, essential oils and their lead molecules have been extensively recognised for their anti-infective properties. In this context, certain volatile phenolics (VPs) have emerged as important antimicrobial compounds with excellent inhibitory activity against pathogenic bacteria and fungi, which further extends to drug-resistant and biofilm-forming micro-organisms. In this review, we aim to collate and discuss a number of published papers on the anti-infective activities of naturally occurring VPs with special emphasis on eugenol, isoeugenol, thymol and carvacrol, using Scopus Web of Science and PubMed databases. The biosynthesis and extraction of these VPs are discussed, while particular attention is given to their broad-spectrum antimicrobial activity and the mechanisms of action. We highlight combinational studies of the VPs with other phytocompounds and with commercially available drugs, which may be a promising and a rewarding future approach to combat antimicrobial resistance. These VPs alone, or concomitantly with other compounds or drugs, have the potential to be incorporated into different formulations for biomedical applications. An in-depth assessment of 2310 articles retrieved from the Scopus database spanning a 35-year period indicated 23.1% increase in global publication growth in VPs anti-infective research, with authors from Italy, Portugal and Austria dominating the research landscape. The dominant areas of investigations are identified as antimicrobial activity, antibacterial mechanism of action, antifungal mechanism of action, extraction methods and phytochemistry, use in the food industry, and for oral and dental anti-infective activity. Specific research areas, which require future attention include; antituberculosis research, nanoparticle formulation of antimicrobial active VP molecules, preclinical and clinical trials. The antimicrobial testing of isoeugenol was found to be the least studied of the VPs and this requires further attention.
Collapse
Affiliation(s)
- Aijaz Ahmad
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa; Clinical Microbiology and Infectious Diseases, Faculty of Health Sciences, School of Pathology, University of Witwatersrand, Johannesburg, South Africa.
| | - Ishaku Leo Elisha
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa; Drug Development Section, Biochemistry Division, National Veterinary Research Institute, P.M.B. 01 Vom, Plateau State, Nigeria.
| | - Sandy van Vuuren
- Department of Pharmacy and Pharmacology, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown, 2193, South Africa.
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa; SAMRC Herbal Drugs Research Unit, Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa.
| |
Collapse
|
15
|
Rapper SLD, Tankeu SY, Kamatou G, Viljoen A, van Vuuren S. The use of chemometric modelling to determine chemical composition-antimicrobial activity relationships of essential oils used in respiratory tract infections. Fitoterapia 2021; 154:105024. [PMID: 34455037 DOI: 10.1016/j.fitote.2021.105024] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 08/18/2021] [Accepted: 08/19/2021] [Indexed: 12/19/2022]
Abstract
The antimicrobial effects of essential oils are commonly cited within aromatherapeutic texts for use in respiratory tract infections. These essential oils are inhaled or applied to the skin to treat infections and manage symptoms associated with these conditions. A limited number of these essential oils have been scientifically studied to support these claims, specifically, against respiratory pathogens. This study reports on the minimum inhibitory concentration (MIC) of 49 commercial essential oils recommended for respiratory tract infections, and identifies putative biomarkers responsible for the determined antimicrobial effect following a biochemometric workflow. Essential oils were investigated against nine pathogens. Three essential oils, Amyris balsamifera (amyris), Coriandrum sativum (coriander) and Santalum austrocaledonicum (sandalwood) were identified as having greater activity (MIC value = 0.03-0.13 mg/ml) compared to the other essential oils investigated. The essential oil composition of all 49 oils were determined using Gas Chromatography coupled to Mass Spectroscopy (GC-MS) analysis and the GC-MS data analysed together with the antimicrobial data using chemometric tools. Eugenol was identified as the main biomarker responsible for antimicrobial activity in the majority of the essential oils. The ability of a chemometric model to accurately predict the active and inactive biomarkers of the investigated essential oils against pathogens of the respiratory tract was 80.33%.
Collapse
Affiliation(s)
- Stephanie Leigh-de Rapper
- Department of Pharmacy and Pharmacology, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown 2193, South Africa
| | - Sidonie Yankam Tankeu
- Department of Pharmaceutical Sciences, Faculty of Sciences, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
| | - Guy Kamatou
- Department of Pharmaceutical Sciences, SAMRC Herbal Drugs Research Unit, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Faculty of Sciences, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa; Department of Pharmaceutical Sciences, SAMRC Herbal Drugs Research Unit, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
| | - Sandy van Vuuren
- Department of Pharmacy and Pharmacology, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown 2193, South Africa.
| |
Collapse
|
16
|
Mikayoulou M, Mayr F, Temml V, Pandian A, Vermaak I, Chen W, Komane B, Stuppner H, Viljoen A. Anti-tyrosinase activity of South African Aloe species and isolated compounds plicataloside and aloesin. Fitoterapia 2021; 150:104828. [PMID: 33434632 DOI: 10.1016/j.fitote.2021.104828] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 12/31/2020] [Accepted: 01/05/2021] [Indexed: 01/27/2023]
Abstract
Tyrosinase is the key enzyme in the production of melanin. Tyrosinase inhibitors have gained interest in the cosmetics industry to prevent hyperpigmentation and skin-related disorders by inhibiting melanin production. It has been reported that several Aloe species exhibit anti-tyrosinase efficacy in vitro. In this study, the exudates of thirty-nine South African Aloe species were screened to identify species and compounds with anti-tyrosinase activity. Qualitative screening revealed that twenty-nine Aloe species exhibited tyrosinase inhibition activity with one to three active bands. Quantitative screening was performed for 29 species and expressed as IC50 values. Three species were further analysed and subsequently, aloesin and aloeresin A was isolated from A. ferox and plicataloside from A. plicatilis and A. chabaudii. Aloeresin A was determined to be a substrate of mushroom tyrosinase. Dose-response assays showed that aloesin (IC50 = 31.5 μM) and plicataloside (IC50 = 84.1 μM) exhibited moderate to weak activity. Molecular docking scores for plicataloside were considerably lower than for aloesin (P < 0.01), confirming its lower IC50. Several Aloe species may have potential for the management of hyperpigmentation or as a skin lightening agent. This is the first report showing that plicataloside, present in A. plicatilis and A. chabaudii, exhibits anti-tyrosinase activity.
Collapse
Affiliation(s)
- Miena Mikayoulou
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
| | - Fabian Mayr
- Institute of Pharmacy/Pharmacognosy, Centre for Molecular Biosciences Innsbruck (CMBI), University of Innsbruck, Innrain 80/82, 6020, Innsbruck, Austria
| | - Veronika Temml
- Department of Pharmaceutical Chemistry, Paracelsus Medical University Salzburg, Strubergasse 21, 5020 Salzburg, Austria
| | - Arjun Pandian
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
| | - Ilze Vermaak
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa; SAMRC Herbal Drugs Research Unit, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
| | - Weiyang Chen
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
| | - Baatile Komane
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
| | - Hermann Stuppner
- Department of Pharmaceutical Chemistry, Paracelsus Medical University Salzburg, Strubergasse 21, 5020 Salzburg, Austria
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa; SAMRC Herbal Drugs Research Unit, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa.
| |
Collapse
|
17
|
Leonard C, Kamatou G, van Vuuren S, Sandasi M, Viljoen A. Essential Oil Variation within Warburgia salutaris-A Coveted Ethnomedicinal Aromatic Tree. Chem Biodivers 2020; 17:e2000542. [PMID: 33231346 DOI: 10.1002/cbdv.202000542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Accepted: 10/01/2020] [Indexed: 11/09/2022]
Abstract
Warburgia salutaris, known as 'Pepper bark', is an ethnomedicinally important tree found in the southern regions of Africa. A total of 75 fresh leaf specimens of W. salutaris (n=40 wild and 35 cultivated) were collected from the Limpopo (wild) and KwaZulu-Natal provinces (cultivated), two distinct locations in South Africa. In this study, the leaf essential oils obtained by hydrodistillation were characterized using gas chromatography coupled to mass spectrometry/flame ionization detection (GC/MS/FID). More than 15 compounds, accounting for 90-99 % of the total oil composition were identified. The analysis revealed that myrcene (0.6-65.3 %), (E)-β-ocimene (nd-56.9 %), (Z)-β-ocimene (nd-19.1 %), α-pinene (nd-19.1 %) and limonene (nd-11.7 %) are major constituents of W. salutaris essential oils. Chemometric analysis revealed two major chemotypes within the essential oils with a modeled variation of approximately 60 %. Linalool and germacrene D were revealed as markers associated with the wild-harvested oils, while cultivated oils were distinguished by higher levels of limonene and α-humulene. The intra-population variation indicated two chemically distinct chemotypes from three different populations, however, the season of harvest did not have a direct influence on the chemical profiles of the essential oils.
Collapse
Affiliation(s)
- Carmen Leonard
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - Guy Kamatou
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - Sandy van Vuuren
- Department of Pharmacy and Pharmacology, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Johannesburg, Parktown, 2193, South Africa
| | - Maxleene Sandasi
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa.,SAMRC Herbal Drug Research Unit, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa.,SAMRC Herbal Drug Research Unit, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| |
Collapse
|
18
|
Hendriks SL, Viljoen A, Marais D, Wenhold FAM, McIntyre AM, Ngidi MS, Annandale JG, Kalaba M, Stewart D. Considerations for the design of nutrition-sensitive production programmes in rural South Africa. BMC Public Health 2020; 20:1383. [PMID: 32912223 PMCID: PMC7488396 DOI: 10.1186/s12889-020-09445-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Accepted: 08/25/2020] [Indexed: 12/02/2022] Open
Abstract
Background Very little has been researched about the efficacy, effectiveness, feasibility, sustainability and impact of food-based approaches on the diets and nutritional status of populations at risk of hunger and food insecurity. This study contributes knowledge about the impact of food-based approaches on the diets of populations at risk of hunger and food insecurity in four of the poorest rural communities in South Africa. The study investigated the consumption and production patterns of rural households (278 in summer and 280 in winter) in four sites in the poorest municipalities in South Africa. Methods A multistage stratified random sampling technique was applied to identify the communities and sample households for the quantitative survey and qualitative assessments. Qualitative and quantitative data were collected between 2013 and 2015 through focus group discussions (FGDs), key informant interviews and the two-round panel survey to cover both the summer and winter seasons at each site. Results Home gardening led to a significant positive increase in the consumption of white roots and tubers, dark green leafy vegetables, orange-coloured fruit and other fruit in the 24 h prior to the survey. Participation in a community garden led to significant increases in the consumption of dark green leafy vegetables and other vegetables. School gardening did not demonstrate any statistical relationships with the consumption of foods from the crop-related food groups. Crop production improved dietary diversity. Selling produce and irrigation showed a stronger improvement in dietary diversity. Seasonality affected the availability of fresh fruit and vegetables for home consumption in winter. Conclusions Producing beyond that solely for home consumption has greater benefits for dietary diversity and a consumption-smoothing effect during the post-harvest period. Politicians and the scientific community should recognise the role that household and small-scale crop production plays in supporting household consumption and the provision of essential micronutrients despite constraints and disincentives. Production and education programmes should focus on strengthening existing good consumption patterns and promoting the consumption of foods that can improve dietary diversity.
Collapse
Affiliation(s)
- S L Hendriks
- Department of Agricultural Economics, Extension and Rural Development, University of Pretoria, PBag X01, Hatfield, Pretoria, 0028, South Africa.
| | - A Viljoen
- Department of Consumer Science, University of Pretoria, PBag X01, Hatfield, Pretoria, 0028, South Africa
| | - D Marais
- Department of Plant and Soil Sciences, University of Pretoria, PBag X01, Hatfield, Pretoria, 0028, South Africa
| | - F A M Wenhold
- Department of Human Nutrition, University of Pretoria, X323, Arcadia, Pretoria, 0007, South Africa
| | - A M McIntyre
- Department of Agricultural Economics, Extension and Rural Development, University of Pretoria, PBag X01, Hatfield, Pretoria, 0028, South Africa
| | - M S Ngidi
- Department of Agricultural Extension and Rural Resource Management, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, Pietermaritzburg, PBag01, Scottsville, 3209, South Africa
| | - J G Annandale
- Department of Plant and Soil Sciences, University of Pretoria, PBag X01, Hatfield, Pretoria, 0028, South Africa
| | - M Kalaba
- Department of Agricultural Economics, Extension and Rural Development, University of Pretoria, PBag X01, Hatfield, Pretoria, 0028, South Africa
| | - D Stewart
- Lima Rural Development Foundation, 2 Forrester's Lane, Pietermaritzburg, 3201, South Africa
| |
Collapse
|
19
|
Links S, van Zyl K, Cassiem A, Flett B, Viljoen A, Rose L. The association of maize characteristics with resistance to Fusarium verticillioides and fumonisin accumulation in commercial maize cultivars. WORLD MYCOTOXIN J 2020. [DOI: 10.3920/wmj2019.2537] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Fusarium verticillioides is the primary fungus that causes Fusarium ear rot (FER) of maize. Infection results in reduced grain yield and quality due to moulding and the contamination of grain with toxic compounds namely fumonisins. Resistance to fungal infection and fumonisin accumulation in maize and maize grain is governed at different levels. In this study, the structural, physico-chemical and genetic basis of resistance to F. verticillioides was investigated in two, replicated field trials at Potchefstroom and Vaalharts in South Africa. Phenotypic data (silk length, husk coverage, pericarp thickness hundred-kernel mass and kernel hardness), physico-chemical data (kernel pH, moisture content, total nitrogen and carbon as well as phenolic acid content) and the expression of pathogenesis-related-5 gene (PR5) and peroxidase gene expression was evaluated in 15 commercial cultivars under artificially inoculated and natural infection conditions. The data were correlated to FER severity, fumonisin accumulation and fungal DNA (referred to as infection indicators). Disease development and fumonisin contamination in Vaalharts was significantly more than in Potchefstroom. There were no significant correlations (r=≥0.60) between phenotypic characteristics and infection indicators. Kernel pH was the most important trait associated with disease development and was negatively correlated (between r=-0.58 and r=-0.75) to all infection indicators. PR5 gene expression had significant positive correlations (r=0.69 and r=0.72) with the fungal and fumonisin levels, respectively. This study presents of the first data demonstrating the use of gene expression in identifying FER/fumonisin-resistant plant material and could aid breeders and growers in selecting resistant material more effectively.
Collapse
Affiliation(s)
- S. Links
- Stellenbosch University, Faculty of AgriSciences, Stellenbosch, Matieland 7602, South Africa
- Grain SA, Research and Policy Centre, 457 Witherite Street, Willow Acres, Pretoria, 7600, South Africa
| | - K. van Zyl
- Stellenbosch University, Faculty of AgriSciences, Stellenbosch, Matieland 7602, South Africa
| | - A. Cassiem
- Stellenbosch University, Faculty of AgriSciences, Stellenbosch, Matieland 7602, South Africa
| | - B.C. Flett
- Agricultural Research Council, Grain Crops, Potchefstroom, 2520, South Africa
| | - A. Viljoen
- Stellenbosch University, Faculty of AgriSciences, Stellenbosch, Matieland 7602, South Africa
| | - L.J. Rose
- Stellenbosch University, Faculty of AgriSciences, Stellenbosch, Matieland 7602, South Africa
| |
Collapse
|
20
|
Heinrich M, Appendino G, Efferth T, Fürst R, Izzo AA, Kayser O, Pezzuto JM, Viljoen A. Best practice in research - Overcoming common challenges in phytopharmacological research. J Ethnopharmacol 2020; 246:112230. [PMID: 31526860 DOI: 10.1016/j.jep.2019.112230] [Citation(s) in RCA: 298] [Impact Index Per Article: 74.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 09/10/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND The pharmacology, toxicology and pharmacokinetics of bioactive preparations derived from natural sources has become a flourishing field of research. However, researching complex extracts and natural products faces numerous challenges. More broadly in recent years the critique of pharmacological research, and specifically its design, the methods used and reporting has intensified. AIMS This consensus document provides a perspective on what constitutes best practice in pharmacological research on bioactive preparations derived from natural sources, providing a perspective of what the leading specialist journals in the field consider as the core characteristics of good research. APPROACH ('METHODS') The editors-in-chief of seven journals developed this best practice statement in an iterative process. A first draft of the guidelines (prepared by MH) was then discussed and amended by the other editors. OUTCOMES Core to this contribution is a table which provides detailed advice including simple points like a use of appropriate controls and the full taxonomic validity of the material under investigation (see also below), to the relevance of the model for the question being researched (e.g., can specific in silico or in vitro models really address the species anti-inflammatory activity?). Therefore, obviously, researchers must pay detailed attention to reporting and discussing such studies. This information must be discussed critically (as much as it is possible based on the published papers) in terms of their scientific quality and validity. While these points are obvious, as editors, we are aware that they are often not properly implemented. CONCLUSION We call for an approach which incorporates a careful design, meticulous execution and a detailed reporting of studies focusing on the pharmacology/bioactivity of bioactive preparations. Clearly testable research questions must be developed and investigated experimentally. As the founder of pharmacology Claude Bernard put it already in 1865: '…. either the experimenter's hypothesis will be disproved or it will be proved by experiment. When experiment disproves its preconceived ideas, the experimenter must discard or modify it.'
Collapse
Affiliation(s)
- Michael Heinrich
- Pharmacognosy and Phytotherapy, UCL School of Pharmacy, 29 - 39 Brunswick Sq., London, WC1N 1AX, UK.
| | - Giovanni Appendino
- Dipartimento di Scienze del Farmaco, Largo Donegani 2, 28100, Novara, Italy.
| | - Thomas Efferth
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, Johannes Gutenberg University, Staudinger Weg 5, 55128, Mainz, Germany.
| | - Robert Fürst
- Institute of Pharmaceutical Biology, Faculty of Biochemistry, Chemistry and Pharmacy, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438, Frankfurt, Germany.
| | - Angelo A Izzo
- Department of Pharmacy, School of Medicine and Surgery, University of Naples Federico II, Via D Montesano 49, Naples, Italy.
| | - Oliver Kayser
- Technical Biochemistry, TU Dortmund University, Emil-Figge-Strasse 66, 44227, Dortmund, Germany.
| | - John M Pezzuto
- Arnold & Marie Schwartz College of Pharmacy and Health Sciences, Long Island University, 75 DeKalb Avenue, Brooklyn, NY, USA.
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa; SAMRC Herbal Drugs Research Unit, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa.
| |
Collapse
|
21
|
Kimunye JN, Were E, Mussa F, Tazuba A, Jomanga K, Viljoen A, Swennen R, Muthoni FK, Mahuku G. Distribution of Pseudocercospora species causing Sigatoka leaf diseases of banana in Uganda and Tanzania. Plant Pathol 2020; 69:50-59. [PMID: 31894162 PMCID: PMC6919302 DOI: 10.1111/ppa.13105] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 09/25/2019] [Accepted: 09/29/2019] [Indexed: 05/31/2023]
Abstract
Sigatoka leaf diseases are a major constraint to banana production. A survey was conducted in Tanzania and Uganda to assess the distribution of Pseudocercospora species and severity of Sigatoka leaf diseases. Pseudocercospora species were identified using species-specific primers. Sigatoka-like leaf diseases were observed in all farms and on all cultivars, but disease severity varied significantly (P < 0.001) between countries, districts/regions within countries, altitudinal ranges and banana cultivars. In all regions except Kilimanjaro, P. fijiensis, the causal agent of black Sigatoka, was the only pathogen associated with Sigatoka disease. Mycosphaerella musae was associated with Sigatoka-like symptoms in Kilimanjaro region. Black Sigatoka disease was more severe in Uganda, with a mean disease severity index (DSI) of 37.5%, than in Tanzania (DSI = 19.9%). In Uganda, black Sigatoka disease was equally severe in Luwero district (mean DSI = 40.4%) and Mbarara district (mean DSI = 37.9%). In Tanzania, black Sigatoka was most severe in Kagera region (mean DSI = 29.2%) and least in Mbeya region (mean DSI = 11.5%). Pseudocercospora fijiensis, the most devastating sigatoka pathogen, was detected at altitudes of up to 1877 m a.s.l. This range expansion of P. fijiensis, previously confined to altitudes lower than 1350 m a.s.l. in East Africa, is of concern, especially for smallholder banana farmers growing the susceptible East African Highland bananas (EAHB). Among the banana varieties sampled, the EAHB, FHIA hybrids and Mchare were the most susceptible. Here, the loss of resistance in Yangambi KM5, a banana variety previously resistant to P. fijiensis, is reported for the first time.
Collapse
Affiliation(s)
- J. N. Kimunye
- International Institute of Tropical Agriculture, PO Box 7878, Kampala, Uganda
- Department of Plant Pathology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa
| | - E. Were
- International Institute of Tropical Agriculture, PO Box 7878, Kampala, Uganda
| | - F. Mussa
- International Institute of Tropical Agriculture (IITA), Dar es Salaam, PO Box 34441, Tanzania
| | - A. Tazuba
- International Institute of Tropical Agriculture, PO Box 7878, Kampala, Uganda
| | - K. Jomanga
- International Institute of Tropical Agriculture (IITA), c/o Nelson Mandela African Institution of Science and Technology, Nelson Mandela Road, Arusha, Tanzania
| | - A. Viljoen
- International Institute of Tropical Agriculture (IITA), Dar es Salaam, PO Box 34441, Tanzania
| | - R. Swennen
- International Institute of Tropical Agriculture (IITA), c/o Nelson Mandela African Institution of Science and Technology, Nelson Mandela Road, Arusha, Tanzania
- Laboratory of Tropical Crop Improvement, KU Leuven, Willem De Croylaan 42, 3001 Leuven, Belgium
| | | | - G. Mahuku
- International Institute of Tropical Agriculture, PO Box 7878, Kampala, Uganda
- International Institute of Tropical Agriculture (IITA), Dar es Salaam, PO Box 34441, Tanzania
| |
Collapse
|
22
|
|
23
|
Makolo F, Viljoen A, Veale CGL. Mesembrine: The archetypal psycho-active Sceletium alkaloid. Phytochemistry 2019; 166:112061. [PMID: 31299396 DOI: 10.1016/j.phytochem.2019.112061] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 06/06/2019] [Accepted: 06/30/2019] [Indexed: 06/10/2023]
Abstract
(-)-Mesembrine is a chiral alkaloid that features an aryloctahydroindole skeleton and is most commonly found in species of the succulent genus Sceletium. Several Sceletium species are used by various ethnic groups in South Africa to manage disorders of the central nervous system. Binding assays have revealed that mesembrine is a more potent inhibitor of the serotonin transporter (SERT) than fluoxetine (Prozac) which has prompted the commercialization of mesembrine-containing consumer products. The congested all carbon quaternary stereocenter present at the bridgehead of mesembrine has rendered it a compound of interest for research in synthetic chemistry, which has assisted in the absolute configuration of the naturally occurring isomer to be assigned. Accordingly, this review will cover the recent literature pertaining to the distribution, structural elucidation, chemotaxonomy, biosynthesis, organic synthesis, as well as the biological activities of (-)-mesembrine. Recent synthetic procedures of the non-natural enantiomer as well as the racemate are also considered.
Collapse
Affiliation(s)
- Felix Makolo
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa; SAMRC Herbal Drugs Research Unit, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - Clinton G L Veale
- School of Chemistry and Physics, Pietermaritzburg Campus, University of KwaZulu-Natal, Private Bag X01, Scottsville, 3209, South Africa.
| |
Collapse
|
24
|
Kharsany K, Viljoen A, Leonard C, van Vuuren S. The new buzz: Investigating the antimicrobial interactions between bioactive compounds found in South African propolis. J Ethnopharmacol 2019; 238:111867. [PMID: 30978456 DOI: 10.1016/j.jep.2019.111867] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 04/04/2019] [Accepted: 04/04/2019] [Indexed: 06/09/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Propolis, a resinous substance produced by the Apis mellifera bee, contains a number of flavonoids sourced from plants found in the surrounding region. Whilst bees use this substance to seal off and protect the beehive, humans have used propolis therapeutically for centuries, making use of its antibacterial, antiseptic, antipyretic and wound healing properties, among others. South African propolis is rich in the flavonoids pinocembrin, galangin, and chrysin and very little previous research has been conducted on the antimicrobial effects of these compounds. AIM OF THE STUDY To obtain an understanding of the antimicrobial activity of the compounds pinocembrin, galangin, and chrysin, both independently and in combination. MATERIALS AND METHODS The compounds pinocembrin, galangin and chrysin were investigated for interactive antimicrobial activity by determining the minimum inhibitory concentrations (MIC), minimum bactericidal concentrations (MBC), anti-quorum sensing activity, biofilm studies, and toxicity studies (brine shrimp lethality assay). RESULTS Minimum inhibitory concentration results demonstrated that combinations of compounds showed better inhibitory activity than single compounds. When the flavonoids were tested in combination using the MIC assay, synergy was noted for 22% of the 1:1 ratio combinations and for 66% of the triple 1:1:1 ratio combinations. Similarly, MBC results showed bactericidal activity from selected combinations, while the compounds on their own demonstrated no cidal activity. Quorum sensing studies showed that compound combinations are more effective at inhibiting bacterial communication than the individual compounds. Biofilm assays showed that the highest percentage inhibition was observed for the triple combination against E. coli at 24 h. Finally, brine shrimp lethality studies revealed that combinations of the three compounds had reduced cytotoxicity when compared to the individual compounds. CONCLUSION The results obtained in this study demonstrate that the compounds found in South African propolis work synergistically to achieve an optimal antimicrobial effect, whilst simultaneously minimizing cytotoxicity.
Collapse
Affiliation(s)
- K Kharsany
- Department of Pharmacy and Pharmacology, Faculty of Health Science, University of the Witwatersrand, 7 York Road, Parktown, 2193, South Africa
| | - A Viljoen
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa; SAMRC Herbal Drugs Research Unit, Department of Pharmaceutical Sciences, Tshwane University of Technology, Pretoria, South Africa
| | - C Leonard
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - S van Vuuren
- Department of Pharmacy and Pharmacology, Faculty of Health Science, University of the Witwatersrand, 7 York Road, Parktown, 2193, South Africa.
| |
Collapse
|
25
|
Fantoukh OI, Dale OR, Parveen A, Hawwal MF, Ali Z, Manda VK, Khan SI, Chittiboyina AG, Viljoen A, Khan IA. Safety Assessment of Phytochemicals Derived from the Globalized South African Rooibos Tea ( Aspalathus linearis) through Interaction with CYP, PXR, and P-gp. J Agric Food Chem 2019; 67:4967-4975. [PMID: 30955332 DOI: 10.1021/acs.jafc.9b00846] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Rooibos tea ( Aspalathus linearis) is a well-known South African herbal tea enjoyed worldwide. Limited reports indicate the potential of rooibos tea to alter the activity of certain cytochrome P450 (CYP450) isozymes. In this study, the phytochemical investigation of MeOH extract of A. linearis (leaves and stems) resulted in the isolation and characterization of 11 phenolic compounds. The MeOH extract exhibited significant inhibition of the major human CYP450 isozymes (CYP3A4, CYP1A2, CYP2D6, CYP2C9, and CYP2C19). The strongest inhibition was observed by the extract for CYP3A4 (IC50 1.7 ± 0.1 μg/mL) followed by CYP2C19 (IC50 4.0 ± 0.3 μg/mL). Among the tested phytochemicals, the most potent inhibitors were isovitexin on CYP3A4 (IC50 3.4 ± 0.2 μM), vitexin on CYP2C9 (IC50 8.0 ± 0.2 μM), and thermopsoside on CYP2C19 (IC50 9.5 ± 0.2 μM). The two major, structurally related compounds aspalathin and nothofagin exhibited a moderate pregnane-X receptor (PXR) activation, which was associated with increased mRNA expression of CYP3A4 and CYP1A2, respectively. These results indicate that a high intake of nutraceuticals containing rooibos extracts may pose a risk of herb-drug interactions when consumed concomitantly with clinical drugs that are substrates of CYP enzymes.
Collapse
Affiliation(s)
- Omer I Fantoukh
- National Center for Natural Products Research, School of Pharmacy , The University of Mississippi , University , Mississippi 38677 , United States
- Division of Pharmacognosy, Department of BioMolecular Sciences , School of Pharmacy, The University of Mississippi , University , Mississippi 38677 , United States
- Department of Pharmacognosy, College of Pharmacy , King Saud University , Riyadh 4545 , Saudi Arabia
| | - Olivia R Dale
- National Center for Natural Products Research, School of Pharmacy , The University of Mississippi , University , Mississippi 38677 , United States
| | - Abidah Parveen
- National Center for Natural Products Research, School of Pharmacy , The University of Mississippi , University , Mississippi 38677 , United States
- Division of Pharmacognosy, Department of BioMolecular Sciences , School of Pharmacy, The University of Mississippi , University , Mississippi 38677 , United States
| | - Mohammed F Hawwal
- National Center for Natural Products Research, School of Pharmacy , The University of Mississippi , University , Mississippi 38677 , United States
- Division of Pharmacognosy, Department of BioMolecular Sciences , School of Pharmacy, The University of Mississippi , University , Mississippi 38677 , United States
- Department of Pharmacognosy, College of Pharmacy , King Saud University , Riyadh 4545 , Saudi Arabia
| | - Zulfiqar Ali
- National Center for Natural Products Research, School of Pharmacy , The University of Mississippi , University , Mississippi 38677 , United States
| | - Vamshi K Manda
- National Center for Natural Products Research, School of Pharmacy , The University of Mississippi , University , Mississippi 38677 , United States
| | - Shabana I Khan
- National Center for Natural Products Research, School of Pharmacy , The University of Mississippi , University , Mississippi 38677 , United States
- Division of Pharmacognosy, Department of BioMolecular Sciences , School of Pharmacy, The University of Mississippi , University , Mississippi 38677 , United States
| | - Amar G Chittiboyina
- National Center for Natural Products Research, School of Pharmacy , The University of Mississippi , University , Mississippi 38677 , United States
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences and SAMRC Herbal Drugs Research Unit , Tshwane University of Technology , Pretoria 0183 , South Africa
| | - Ikhlas A Khan
- National Center for Natural Products Research, School of Pharmacy , The University of Mississippi , University , Mississippi 38677 , United States
- Division of Pharmacognosy, Department of BioMolecular Sciences , School of Pharmacy, The University of Mississippi , University , Mississippi 38677 , United States
| |
Collapse
|
26
|
Orchard A, Viljoen A, van Vuuren S. Wound Pathogens: Investigating Antimicrobial Activity of Commercial Essential Oil Combinations against Reference Strains. Chem Biodivers 2018; 15:e1800405. [DOI: 10.1002/cbdv.201800405] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Accepted: 10/23/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Ané Orchard
- Department of Pharmacy and Pharmacology, Faculty of Health Sciences; University of the Witwatersrand; Johannesburg South Africa
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Faculty of Sciences, Tshwane; University of Technology, Private Bag X680; Pretoria 0001 South Africa
- Department of Pharmaceutical Sciences, SAMRC Herbal Drugs Research Unit; Tshwane University of Technology, Private Bag X680; Pretoria 0001 South Africa
| | - Sandy van Vuuren
- Department of Pharmacy and Pharmacology, Faculty of Health Sciences; University of the Witwatersrand; Johannesburg South Africa
| |
Collapse
|
27
|
Orchard A, Viljoen A, van Vuuren S. Cover Picture: Wound Pathogens: Investigating Antimicrobial Activity of Commercial Essential Oil Combinations against Reference Strains (C&B 12/2018). Chem Biodivers 2018. [DOI: 10.1002/cbdv.201800631] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ané Orchard
- Department of Pharmacy and Pharmacology, Faculty of Health Sciences; University of the Witwatersrand; Johannesburg South Africa
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Faculty of Sciences, Tshwane; University of Technology, Private Bag X680; Pretoria 0001 South Africa
- Department of Pharmaceutical Sciences, SAMRC Herbal Drugs Research Unit; Tshwane University of Technology, Private Bag X680; Pretoria 0001 South Africa
| | - Sandy van Vuuren
- Department of Pharmacy and Pharmacology, Faculty of Health Sciences; University of the Witwatersrand; Johannesburg South Africa
| |
Collapse
|
28
|
Havenga K, Abay E, Wiesner L, Viljoen A, Steyn D, Hamman J. The In Vitro and In Vivo Effects of Hypoxis hemerocallidea on Indinavir Pharmacokinetics: Modulation of Efflux. Planta Med 2018; 84:895-901. [PMID: 29672818 DOI: 10.1055/a-0607-2743] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Hypoxis hemerocallidea (African potato) is a popular medicinal plant that has been used traditionally for the treatment of various disorders. Some HIV/AIDS patients use this traditional medicine together with their antiretroviral therapy. This study aimed to determine the impact of selected H. hemerocallidea materials (i.e., a commercial product, an aqueous extract, and biomass reference plant material) on the bidirectional permeability of indinavir across Caco-2 cell monolayers as well as the bioavailability of indinavir during an acute, single administration study in Sprague-Dawley rats. All of the selected H. hemerocallidea test materials demonstrated inhibition effects on indinavir efflux across Caco-2 cell monolayers, albeit to different extents. An increase in the bioavailability of indinavir was obtained in vivo when administered concomitantly with the H. hemerocallidea materials, albeit not statistically significantly. The change in bioavailability directly correlated with the in vitro permeability results. It can therefore be concluded that the change in permeability and bioavailability of indinavir was caused by efflux inhibition and this effect was dependent on the type of H. hemerocallidea material investigated, which was found to be in the following order: commercial product > aqueous extract > reference plant material. The clinical significance of the combined effect of efflux and metabolism inhibition by H. hemerocallidea should be determined in another in vivo model that expresses the cytochrome P450 3A4 enzyme.
Collapse
Affiliation(s)
- Kaylee Havenga
- Centre of Excellence for Pharmaceutical Sciences, Faculty of Health Sciences, North-West University, Potchefstroom, South Africa
| | - Efrem Abay
- Division of Clinical Pharmacology, Department of Medicine, University of Cape Town, Observatory, South Africa
| | - Lubbe Wiesner
- Division of Clinical Pharmacology, Department of Medicine, University of Cape Town, Observatory, South Africa
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Pretoria, South Africa
- SAMRC Herbal Drugs Research Center, Tshwane University of Technology, Pretoria, South Africa
| | - Dewald Steyn
- Centre of Excellence for Pharmaceutical Sciences, Faculty of Health Sciences, North-West University, Potchefstroom, South Africa
| | - Josias Hamman
- Centre of Excellence for Pharmaceutical Sciences, Faculty of Health Sciences, North-West University, Potchefstroom, South Africa
| |
Collapse
|
29
|
Wierzbicki A, Viljoen A, Viljoen S, Martin S, Crook M, Reynolds T. Review of referral criteria to lipid clinics and outcomes of treatment in 4 UK centres. Atherosclerosis 2018. [DOI: 10.1016/j.atherosclerosis.2018.06.756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
30
|
Mmopele K, Combrinck S, Hamman J, Willers C, Chen W, Viljoen A. Potential Herb-Drug Pharmacokinetic Interactions between African Wild Olive Leaf Extract and Selected Antihypertensive Drugs. Planta Med 2018; 84:886-894. [PMID: 29554707 DOI: 10.1055/a-0583-0543] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The African wild olive (Olea europaea subsp. africana) is traditionally used as a hypotensive agent. Herb-drug interactions may result from the concurrent use of herbal medicines and conventional prescription drugs. This aspect was investigated by determining the effect of the extract on the in vitro intestinal epithelial permeation of selected hypotensive drugs using the Caco-2 cell culture model. The phytochemical profiles of leaf extracts of African wild olive from different localities in South Africa were compared, since efficacy is determined by the chemical composition. Extracts were analysed using ultra-performance liquid chromatography. The oleuropein concentration varied considerably from below the detection limit (4.94 µg/mL) to 59.4 mg/g dry weight. Chemometric models constructed from the aligned chromatographic data indicated only quantitative differences between the profiles. The leaf extract was found to increase the permeability of propranolol in the absorptive direction (Papp = 8.93 × 10-6 cm/s) across Caco-2 cell monolayers, but considerably decreased transport in the secretory direction (Papp = 3.68 × 10-6 cm/s). The permeation of diltiazem was enhanced by the extract in both the absorptive (Papp = 7.33 × 10-6 cm/s) as well as in the secretory direction (Papp = 7.16 × 10-6 cm/s), but a decrease in the efflux ratio was observed. The extract therefore caused a net increase in the transport of both drugs in the absorptive direction due to an inhibition effect on their efflux. This suggests a potential increase in the blood levels of these drugs when taken simultaneously with African wild olive leaf extract, indicating potential adverse effects that must be verified in vivo.
Collapse
Affiliation(s)
- Katlego Mmopele
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Pretoria, South Africa
| | - Sandra Combrinck
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Pretoria, South Africa
- SAMRC Herbal Drugs Research Unit, Tshwane University of Technology, Pretoria, South Africa
| | - Josias Hamman
- Centre of Excellence for Pharmaceutical Sciences, North-West University, Potchefstroom, South Africa
| | - Clarissa Willers
- Centre of Excellence for Pharmaceutical Sciences, North-West University, Potchefstroom, South Africa
| | - Weiyang Chen
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Pretoria, South Africa
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Pretoria, South Africa
- SAMRC Herbal Drugs Research Unit, Tshwane University of Technology, Pretoria, South Africa
| |
Collapse
|
31
|
Abstract
Foot odour (bromodosis) is an embarrassing and perplexing condition mostly caused by bacteria of the Brevibacterium species. Essential oils are a credible option as an affordable treatment of odour and contribute towards antimicrobial efficacy. Therefore, this study sets out to investigate the antimicrobial activity of essential oil combinations against odour-causing bacteria. The broth microdilution method was used to investigate the antimicrobial activity of 119 essential oil combinations, and the fractional inhibitory index was calculated to determine the interactive profile. Combinations that resulted in synergy in 1 : 1 ratios were further evaluated in different concentrations, and isobolograms were plotted to determine the influence of the ratio on overall activity. Numerous combinations could be identified as having synergistic interactions against the Brevibacterium spp. and no antagonism was observed. The combination of Juniperus virginiana (juniper) and Styrax benzoin (benzoin) demonstrated synergy against all three Brevibacterium spp. tested and J. virginiana was the essential oil responsible for the majority of the synergistic interactions. The results reported here confirm the promising potential of the majority of these oils and selected combinations in treating and controlling bromodosis.
Collapse
Affiliation(s)
- Ané Orchard
- Department of Pharmacy and Pharmacology, University of the Witwatersrand, Johannesburg, South Africa
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Johannesburg, South Africa and Department of Pharmaceutical Sciences, SAMRC Herbal Drugs Research Unit, Tshwane University of Technology, Pretoria, South Africa
| | - Sandy van Vuuren
- Department of Pharmacy and Pharmacology, University of the Witwatersrand, Johannesburg, South Africa
| |
Collapse
|
32
|
Gratwick Z, Donnellan C, Page PC, Viljoen A, Williams J, Lyle CH. Caecal intussusceptions and typhlocolitis in horses with severe Gastrodiscus aegyptiacusinfestation. EQUINE VET EDUC 2018. [DOI: 10.1111/eve.12726] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Z. Gratwick
- Department of Companion Animal Clinical Studies; University of Pretoria; Onderstepoort South Africa
| | - C. Donnellan
- Blue Cross Veterinary Hospital; Cape Town South Africa
| | - P. C. Page
- Department of Companion Animal Clinical Studies; University of Pretoria; Onderstepoort South Africa
| | - A. Viljoen
- Department of Companion Animal Clinical Studies; University of Pretoria; Onderstepoort South Africa
| | - J. Williams
- Department of Paraclinical Studies; University of Pretoria; Onderstepoort South Africa
| | - C. H. Lyle
- Department of Companion Animal Clinical Studies; University of Pretoria; Onderstepoort South Africa
| |
Collapse
|
33
|
Tankeu S, Vermaak I, Chen W, Sandasi M, Kamatou G, Viljoen A. Hyperspectral Imaging and Support Vector Machine: A Powerful Combination to Differentiate Black Cohosh (Actaea racemosa) from Other Cohosh Species. Planta Med 2018; 84:407-419. [PMID: 28985643 DOI: 10.1055/s-0043-119887] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Actaea racemosa (black cohosh) has a history of traditional use in the treatment of general gynecological problems. However, the plant is known to be vulnerable to adulteration with other cohosh species. This study evaluated the use of shortwave infrared hyperspectral imaging (SWIR-HSI) in tandem with chemometric data analysis as a fast alternative method for the discrimination of four cohosh species (Actaea racemosa, Actaea podocarpa, Actaea pachypoda, Actaea cimicifuga) and 36 commercial products labelled as black cohosh. The raw material and commercial products were analyzed using SWIR-HSI and ultra-high-performance liquid chromatography coupled to mass spectrometry (UHPLC-MS) followed by chemometric modeling. From SWIR-HSI data (920 - 2514 nm), the range containing the discriminating information of the four species was identified as 1204 - 1480 nm using Matlab software. After reduction of the data set range, partial least squares discriminant analysis (PLS-DA) and support vector machine discriminant analysis (SVM-DA) models with coefficients of determination (R2 ) of ≥ 0.8 were created. The novel SVM-DA model showed better predictions and was used to predict the commercial product content. Seven out of 36 commercial products were recognized by the SVM-DA model as being true black cohosh while 29 products indicated adulteration. Analysis of the UHPLC-MS data demonstrated that six commercial products could be authentic black cohosh. This was confirmed using the fragmentation patterns of three black cohosh markers (cimiracemoside C; 12-β,21-dihydroxycimigenol-3-O-L-arabinoside; and 24-O-acetylhydroshengmanol-3-O-β-D-xylopyranoside). SWIR-HSI in conjunction with chemometric tools (SVM-DA) could identify 80% adulteration of commercial products labelled as black cohosh.
Collapse
Affiliation(s)
- Sidonie Tankeu
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Pretoria, South Africa
| | - Ilze Vermaak
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Pretoria, South Africa
- SAMRC Herbal Drugs Research Unit, Faculty of Science, Tshwane University of Technology, Pretoria, South Africa
| | - Weiyang Chen
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Pretoria, South Africa
| | - Maxleene Sandasi
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Pretoria, South Africa
| | - Guy Kamatou
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Pretoria, South Africa
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Pretoria, South Africa
- SAMRC Herbal Drugs Research Unit, Faculty of Science, Tshwane University of Technology, Pretoria, South Africa
| |
Collapse
|
34
|
Leonard C, Chen W, van Vuuren S, Viljoen A. Exploring the phytochemical variation of the “Pepper-bark” tree (Warburgia salutaris) using HPTLC and UPLC-MS. Am J Transl Res 2017. [DOI: 10.1055/s-0037-1608527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- C Leonard
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Pretoria, South Africa
| | - W Chen
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Pretoria, South Africa
| | - S van Vuuren
- Department of Pharmacy and Pharmacology, University of Witwatersrand, Johannesburg, South Africa
| | - A Viljoen
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Pretoria, South Africa
- SAMRC Herbal Drugs Research Unit, Faculty of Science, Tshwane University of Technology, Pretoria, South Africa
| |
Collapse
|
35
|
Mncwangi N, Waltenberger B, Baraldo G, Jansen-Dürr P, Viljoen A, Stuppner H. Sclerocarya birrea cortex ethanolic extract – Chemical characterisation and NOX4 inhibition (anti-ageing property). Am J Transl Res 2017. [DOI: 10.1055/s-0037-1608258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- N Mncwangi
- 1. Department of Pharmaceutical Sciences and SAMRC Herbal Drugs Research Unit, Tshwane University of Technology, Private Bag X680, Pretoria, South Africa
| | - B Waltenberger
- 2. Institute of Pharmacy/Pharmacognosy and Center for Molecular Biosciences Innsbruck (CMBI), University of Innsbruck, Innrain 80 – 20, 6020, Innsbruck, Austria
| | - G Baraldo
- 3. Institute for Biomedical Aging Research and CMBI, University of Innsbruck, Rennweg 10, 6020, Innsbruck, Austria
| | - P Jansen-Dürr
- 3. Institute for Biomedical Aging Research and CMBI, University of Innsbruck, Rennweg 10, 6020, Innsbruck, Austria
| | - A Viljoen
- 1. Department of Pharmaceutical Sciences and SAMRC Herbal Drugs Research Unit, Tshwane University of Technology, Private Bag X680, Pretoria, South Africa
| | - H Stuppner
- 2. Institute of Pharmacy/Pharmacognosy and Center for Molecular Biosciences Innsbruck (CMBI), University of Innsbruck, Innrain 80 – 20, 6020, Innsbruck, Austria
| |
Collapse
|
36
|
Komane B, Viljoen A, Vermaak I, Kamatou G, Summers B. Cosmetic application of Marula seed oil (Sclerocarya birrea): Clinical outcomes. Am J Transl Res 2017. [DOI: 10.1055/s-0037-1608569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- B Komane
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa, Pretoria, South Africa
| | - A Viljoen
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa, Pretoria, South Africa
| | - I Vermaak
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa, Pretoria, South Africa
| | - G Kamatou
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa, Pretoria, South Africa
| | - B Summers
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa, Pretoria, South Africa
| |
Collapse
|
37
|
Sandasi M, Chen W, Viljoen A. Identification and quantification of herbal tea blend raw materials using hyperspectral imaging spectroscopy. Am J Transl Res 2017. [DOI: 10.1055/s-0037-1608526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- M Sandasi
- Department of Pharmaceutical Sciences Tshwane University of Technology, Private Bag X680, Pretoria, South Africa
| | - W Chen
- Department of Pharmaceutical Sciences Tshwane University of Technology, Private Bag X680, Pretoria, South Africa
| | - A Viljoen
- Department of Pharmaceutical Sciences Tshwane University of Technology, Private Bag X680, Pretoria, South Africa
- SAMRC Herbal Drugs Research Unit, Tshwane University of Technology, Private Bag X680, Pretoria, South Africa
| |
Collapse
|
38
|
Vermaak I, Tankeu S, Djokam M, Sandasi M, Chen W, Viljoen A. Hyperspectral imaging in combination with chemometric data analysis – a novel approach in the quality control of herbal material. Am J Transl Res 2017. [DOI: 10.1055/s-0037-1608585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- I Vermaak
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Pretoria, South Africa
- SAMRC Herbal Drugs Research Unit, Tshwane University of Technology, Pretoria, South Africa
| | - S Tankeu
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Pretoria, South Africa
| | - M Djokam
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Pretoria, South Africa
| | - M Sandasi
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Pretoria, South Africa
| | - W Chen
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Pretoria, South Africa
| | - A Viljoen
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Pretoria, South Africa
- SAMRC Herbal Drugs Research Unit, Tshwane University of Technology, Pretoria, South Africa
| |
Collapse
|
39
|
Aboobaker Z, van Vuuren S, Viljoen A, Crous P. South African endophytes- potential antimicrobial agents. Am J Transl Res 2017. [DOI: 10.1055/s-0037-1608034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Z Aboobaker
- Department of Pharmacy and Pharmacology, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, 2193, Parktown, South Africa
| | - S van Vuuren
- Department of Pharmacy and Pharmacology, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, 2193, Parktown, South Africa
| | - A Viljoen
- Department of Pharmaceutical Sciences, Faculty of Sciences, Tshwane University of Technology, Private Bag X680, 0001, Pretoria, South Africa
| | - P Crous
- Westerdijk Fungal Biodiversity Institute, P.O. Box 85167, 3508 AD, Utrecht, Netherlands
| |
Collapse
|
40
|
Abstract
Familial hypercholesterolaemia (FH) is a relatively common autosomal dominant genetic condition leading to premature ischaemic vascular disease and mortality if left untreated. Currently, a universal consensus on the diagnostic criteria of FH does not exist but the diagnosis of FH largely relies on the evaluation of low density lipoprotein-cholesterol (LDL-C) levels, a careful documentation of family history, and the identification of clinical features. Diagnosis based purely on lipid levels remains common but there are several limitations to this method of diagnosis both practically and in the proportion of false-negatives and false-positives detected, resulting in substantial under-diagnosis of FH. In some countries, diagnostic algorithms are supplemented with genetic testing of the index case as well as genetic and lipid testing of relatives of the index case. Such "cascade" screening of families following identification of index cases appears to not only improve the rate of diagnosis but is also cost-effective. Currently, we observe a great variation in the excess mortality among patients with FH, which likely reflects a combination of additional genetic and environmental effects on risk overlaid on the risk associated with FH. Current accepted drug therapies for FH include statins and PSCK9 inhibitors. Further work is required to evaluate the cardiovascular disease risk in patients with genetically diagnosed FH and to determine whether a risk-based approach to the treatment of FH is appropriate.
Collapse
Affiliation(s)
- D P Hughes
- Department Metabolic Medicine/Chemical Pathology, Lister Hospital, Stevenage, SG1 4AB, UK
| | - A Viljoen
- Department Metabolic Medicine/Chemical Pathology, Lister Hospital, Stevenage, SG1 4AB, UK.
| | - A S Wierzbicki
- Department Metabolic Medicine/Chemical Pathology, Guy's & St Thomas' Hospitals, St Thomas' Hospital, Lambeth Palace Road, London, SE1 7EH, UK
| |
Collapse
|
41
|
Nsuala BN, Kamatou GP, Sandasi M, Enslin G, Viljoen A. Variation in essential oil composition of Leonotis leonurus, an important medicinal plant in South Africa. BIOCHEM SYST ECOL 2017. [DOI: 10.1016/j.bse.2016.11.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
42
|
Orchard A, Sandasi M, Kamatou G, Viljoen A, van Vuuren S. Thein vitroAntimicrobial Activity and Chemometric Modelling of 59 Commercial Essential Oils against Pathogens of Dermatological Relevance. Chem Biodivers 2017; 14. [DOI: 10.1002/cbdv.201600218] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Accepted: 08/19/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Ané Orchard
- Department of Pharmacy and Pharmacology; Faculty of Health Sciences; University of the Witwatersrand; 7 York Road Parktown 2193 South Africa
| | - Maxleene Sandasi
- Department of Pharmaceutical Sciences; Faculty of Sciences; Tshwane University of Technology; Private Bag X680 Pretoria 0001 South Africa
| | - Guy Kamatou
- Department of Pharmaceutical Sciences; Faculty of Sciences; Tshwane University of Technology; Private Bag X680 Pretoria 0001 South Africa
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences; Faculty of Sciences; Tshwane University of Technology; Private Bag X680 Pretoria 0001 South Africa
- Department of Pharmaceutical Sciences; SAMRC Herbal Drugs Research Unit; Tshwane University of Technology; Private Bag X680 Pretoria 0001 South Africa
| | - Sandy van Vuuren
- Department of Pharmacy and Pharmacology; Faculty of Health Sciences; University of the Witwatersrand; 7 York Road Parktown 2193 South Africa
| |
Collapse
|
43
|
Crous P, Wingfield M, Burgess T, Hardy G, Crane C, Barrett S, Cano-Lira J, Le Roux J, Thangavel R, Guarro J, Stchigel A, Martín M, Alfredo D, Barber P, Barreto R, Baseia I, Cano-Canals J, Cheewangkoon R, Ferreira R, Gené J, Lechat C, Moreno G, Roets F, Shivas R, Sousa J, Tan Y, Wiederhold N, Abell S, Accioly T, Albizu J, Alves J, Antoniolli Z, Aplin N, Araújo J, Arzanlou M, Bezerra J, Bouchara JP, Carlavilla J, Castillo A, Castroagudín V, Ceresini P, Claridge G, Coelho G, Coimbra V, Costa L, da Cunha K, da Silva S, Daniel R, de Beer Z, Dueñas M, Edwards J, Enwistle P, Fiuza P, Fournier J, García D, Gibertoni T, Giraud S, Guevara-Suarez M, Gusmão L, Haituk S, Heykoop M, Hirooka Y, Hofmann T, Houbraken J, Hughes D, Kautmanová I, Koppel O, Koukol O, Larsson E, Latha K, Lee D, Lisboa D, Lisboa W, López-Villalba Á, Maciel J, Manimohan P, Manjón J, Marincowitz S, Marney T, Meijer M, Miller A, Olariaga I, Paiva L, Piepenbring M, Poveda-Molero J, Raj K, Raja H, Rougeron A, Salcedo I, Samadi R, Santos T, Scarlett K, Seifert K, Shuttleworth L, Silva G, Silva M, Siqueira J, Souza-Motta C, Stephenson S, Sutton D, Tamakeaw N, Telleria M, Valenzuela-Lopez N, Viljoen A, Visagie C, Vizzini A, Wartchow F, Wingfield B, Yurchenko E, Zamora J, Groenewald J. Fungal Planet description sheets: 469-557. Persoonia 2016; 37:218-403. [PMID: 28232766 PMCID: PMC5315290 DOI: 10.3767/003158516x694499] [Citation(s) in RCA: 151] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2016] [Accepted: 11/12/2016] [Indexed: 01/18/2023]
Abstract
Novel species of fungi described in this study include those from various countries as follows: Australia: Apiognomonia lasiopetali on Lasiopetalum sp., Blastacervulus eucalyptorum on Eucalyptus adesmophloia, Bullanockia australis (incl. Bullanockia gen. nov.) on Kingia australis, Caliciopsis eucalypti on Eucalyptus marginata, Celerioriella petrophiles on Petrophile teretifolia, Coleophoma xanthosiae on Xanthosia rotundifolia, Coniothyrium hakeae on Hakea sp., Diatrypella banksiae on Banksia formosa, Disculoides corymbiae on Corymbia calophylla, Elsinoë eelemani on Melaleuca alternifolia, Elsinoë eucalyptigena on Eucalyptus kingsmillii, Elsinoë preissianae on Eucalyptus preissiana, Eucasphaeria rustici on Eucalyptus creta, Hyweljonesia queenslandica (incl. Hyweljonesia gen. nov.) on the cocoon of an unidentified microlepidoptera, Mycodiella eucalypti (incl. Mycodiella gen. nov.) on Eucalyptus diversicolor, Myrtapenidiella sporadicae on Eucalyptus sporadica, Neocrinula xanthorrhoeae (incl. Neocrinula gen. nov.) on Xanthorrhoea sp., Ophiocordyceps nooreniae on dead ant, Phaeosphaeriopsis agavacearum on Agave sp., Phlogicylindrium mokarei on Eucalyptus sp., Phyllosticta acaciigena on Acacia suaveolens, Pleurophoma acaciae on Acacia glaucoptera, Pyrenochaeta hakeae on Hakea sp., Readeriella lehmannii on Eucalyptus lehmannii, Saccharata banksiae on Banksia grandis, Saccharata daviesiae on Daviesia pachyphylla, Saccharata eucalyptorum on Eucalyptus bigalerita, Saccharata hakeae on Hakea baxteri, Saccharata hakeicola on Hakea victoria, Saccharata lambertiae on Lambertia ericifolia, Saccharata petrophiles on Petrophile sp., Saccharata petrophilicola on Petrophile fastigiata, Sphaerellopsis hakeae on Hakea sp., and Teichospora kingiae on Kingia australis.Brazil: Adautomilanezia caesalpiniae (incl. Adautomilanezia gen. nov.) on Caesalpina echinata, Arthrophiala arthrospora (incl. Arthrophiala gen. nov.) on Sagittaria montevidensis, Diaporthe caatingaensis (endophyte from Tacinga inamoena), Geastrum ishikawae on sandy soil, Geastrum pusillipilosum on soil, Gymnopus pygmaeus on dead leaves and sticks, Inonotus hymenonitens on decayed angiosperm trunk, Pyricularia urashimae on Urochloa brizantha, and Synnemellisia aurantia on Passiflora edulis. Chile: Tubulicrinis australis on Lophosoria quadripinnata.France: Cercophora squamulosa from submerged wood, and Scedosporium cereisporum from fluids of a wastewater treatment plant. Hawaii: Beltraniella acaciae, Dactylaria acaciae, Rhexodenticula acaciae, Rubikia evansii and Torula acaciae (all on Acacia koa).India: Lepidoderma echinosporum on dead semi-woody stems, and Rhodocybe rubrobrunnea from soil. Iran: Talaromyces kabodanensis from hypersaline soil. La Réunion: Neocordana musarum from leaves of Musa sp. Malaysia: Anungitea eucalyptigena on Eucalyptus grandis × pellita, Camptomeriphila leucaenae (incl. Camptomeriphila gen. nov.) on Leucaena leucocephala, Castanediella communis on Eucalyptus pellita, Eucalyptostroma eucalypti (incl. Eucalyptostroma gen. nov.) on Eucalyptus pellita, Melanconiella syzygii on Syzygium sp., Mycophilomyces periconiae (incl. Mycophilomyces gen. nov.) as hyperparasite on Periconia on leaves of Albizia falcataria, Synnemadiella eucalypti (incl. Synnemadiella gen. nov.) on Eucalyptus pellita, and Teichospora nephelii on Nephelium lappaceum.Mexico: Aspergillus bicephalus from soil. New Zealand: Aplosporella sophorae on Sophora microphylla, Libertasomyces platani on Platanus sp., Neothyronectria sophorae (incl. Neothyronectria gen. nov.) on Sophora microphylla, Parastagonospora phoenicicola on Phoenix canariensis, Phaeoacremonium pseudopanacis on Pseudopanax crassifolius, Phlyctema phoenicis on Phoenix canariensis, and Pseudoascochyta novae-zelandiae on Cordyline australis.Panama: Chalara panamensis from needle litter of Pinus cf. caribaea. South Africa: Exophiala eucalypti on leaves of Eucalyptus sp., Fantasmomyces hyalinus (incl. Fantasmomyces gen. nov.) on Acacia exuvialis, Paracladophialophora carceris (incl. Paracladophialophora gen. nov.) on Aloe sp., and Umthunziomyces hagahagensis (incl. Umthunziomyces gen. nov.) on Mimusops caffra.Spain: Clavaria griseobrunnea on bare ground in Pteridium aquilinum field, Cyathus ibericus on small fallen branches of Pinus halepensis, Gyroporus pseudolacteus in humus of Pinus pinaster, and Pseudoascochyta pratensis (incl. Pseudoascochyta gen. nov.) from soil. Thailand: Neoascochyta adenii on Adenium obesum, and Ochroconis capsici on Capsicum annuum. UK: Fusicolla melogrammae from dead stromata of Melogramma campylosporum on bark of Carpinus betulus. Uruguay: Myrmecridium pulvericola from house dust. USA: Neoscolecobasidium agapanthi (incl. Neoscolecobasidium gen. nov.) on Agapanthus sp., Polyscytalum purgamentum on leaf litter, Pseudopithomyces diversisporus from human toenail, Saksenaea trapezispora from knee wound of a soldier, and Sirococcus quercus from Quercus sp. Morphological and culture characteristics along with DNA barcodes are provided.
Collapse
Affiliation(s)
- P.W. Crous
- CBS-KNAW Fungal Biodiversity Centre, P.O. Box 85167, 3508 AD Utrecht, The Netherlands
- Department of Microbiology and Plant Pathology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, P. Bag X20, Pretoria 0028, South Africa
| | - M.J. Wingfield
- Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria 0002, South Africa
| | - T.I. Burgess
- Centre for Phytophthora Science and Management, Murdoch University, 90 South Street, Murdoch, WA 6150, Australia
| | - G.E.St.J. Hardy
- Centre for Phytophthora Science and Management, Murdoch University, 90 South Street, Murdoch, WA 6150, Australia
| | - C. Crane
- Department of Parks and Wildlife, Vegetation Health Service, Locked Bag 104, Bentley Delivery Centre, Bentley, WA 6983, Australia
| | - S. Barrett
- Department of Parks and Wildlife Albany District, 120 Albany Highway, Albany, WA 6330, Australia
| | - J.F. Cano-Lira
- Mycology Unit, Medical School and IISPV, Universitat Rovira i Virgili (URV), Sant Llorenç 21, 43201 Reus, Tarragona, Spain
| | - J.J. Le Roux
- Centre for Invasion Biology, Department of Botany & Zoology, Stellenbosch University, Matieland 7602, South Africa
| | - R. Thangavel
- Plant Health & Environment Laboratory, Ministry for Primary Industries, Manatū Ahu Matua, 231 Morrin Road, St Johns, Auckland 1072, P.O. Box 2095, Auckland 1140, New Zealand
| | - J. Guarro
- Mycology Unit, Medical School and IISPV, Universitat Rovira i Virgili (URV), Sant Llorenç 21, 43201 Reus, Tarragona, Spain
| | - A.M. Stchigel
- Mycology Unit, Medical School and IISPV, Universitat Rovira i Virgili (URV), Sant Llorenç 21, 43201 Reus, Tarragona, Spain
| | - M.P. Martín
- Departamento de Micología, Real Jardín Botánico-CSIC, Plaza de Murillo 2, 28014 Madrid, Spain
| | - D.S. Alfredo
- Pós-graduação em Sistemática e Evolução, Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil
| | - P.A. Barber
- ArborCarbon, 1 City Farm Place, East Perth, Western Australia, 6004 Australia
| | - R.W. Barreto
- Departamento de Fitopatologia, Universidade Federal de Viçosa, Viçosa, 36570-900, MG, Brazil
| | - I.G. Baseia
- Departamento de Botânica e Zoologia, Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil
| | - J. Cano-Canals
- I.E.S Gabriel Ferrater i Soler, Ctra. de Montblanc, 5-9, 43206 Reus, Tarragona, Spain
| | - R. Cheewangkoon
- Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand
| | - R.J. Ferreira
- Pós-graduação em Biologia de Fungos, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - J. Gené
- Mycology Unit, Medical School and IISPV, Universitat Rovira i Virgili (URV), Sant Llorenç 21, 43201 Reus, Tarragona, Spain
| | - C. Lechat
- Ascofrance, 64 route de Chizé, 79360 Villiers en Bois, France
| | - G. Moreno
- Departamento de Ciencias de la Vida (Unidad Docente de Botánica), Universidad de Alcalá, E-28805 Alcalá de Henares, Madrid, Spain
| | - F. Roets
- Department of Conservation Ecology and Entomology, Stellenbosch University, South Africa
| | - R.G. Shivas
- Department of Agriculture and Fisheries, GPO Box 267, Brisbane 4001, Queensland, Australia
| | - J.O. Sousa
- Departamento de Botânica e Zoologia, Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil
| | - Y.P. Tan
- Department of Agriculture and Fisheries, GPO Box 267, Brisbane 4001, Queensland, Australia
| | - N.P. Wiederhold
- Fungus Testing Laboratory, Department of Pathology, University of Texas Health Science Center, 7703 Floyd Curl Dr., San Antonio, Texas 78229-3900, USA
| | - S.E. Abell
- Australian Tropical Herbarium, James Cook University, PO Box 6811, Cairns 4870, Queensland, Australia
| | - T. Accioly
- Departamento de Botânica e Zoologia, Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil
| | - J.L. Albizu
- Aranzadi Society of Sciences, Mycology section, Zorroagagaina 11, P.C. 200014, Donostia-San Sebastián, Spain
| | - J.L. Alves
- Departamento de Fitopatologia, Universidade Federal de Viçosa, Viçosa, 36570-900, MG, Brazil
| | - Z.I. Antoniolli
- Programa de Pós-graduação em Ciência do Solo, CCR, Universidade Federal de Santa Maria, Av. Roraima n°1000, Campus, Bairro Camobi, CEP 97105-900, Santa Maria, RS, Brasil
| | - N. Aplin
- 21 Shetland Close, Pound Hill, Crawley, West Sussex RH10 7YZ, England, UK
| | - J. Araújo
- Center of Infectious Disease Dynamics, Millennium Science Complex, University Park Campus, Pennsylvania State University, USA
| | - M. Arzanlou
- Plant Protection Department, Faculty of Agriculture, University of Tabriz, P.O. Box 5166614766, Tabriz, Iran
| | - J.D.P. Bezerra
- Departamento de Micologia Prof. Chaves Batista, Universidade Federal de Pernambuco, Recife, Brazil
| | - J.-P. Bouchara
- GEIHP - EA 3142, Université d’Angers, Institut de Biologie en Santé PBH-IRIS CHU, 4 Rue Larrey, 49933 Angers Cedex 9, France
| | - J.R. Carlavilla
- Departamento de Ciencias de la Vida (Unidad Docente de Botánica), Universidad de Alcalá, E-28805 Alcalá de Henares, Madrid, Spain
| | - A. Castillo
- Departamento de Ciencias de la Vida (Unidad Docente de Botánica), Universidad de Alcalá, E-28805 Alcalá de Henares, Madrid, Spain
| | - V.L. Castroagudín
- UNESP-University of São Paulo State, Av. Brasil no. 56, 15385-000, Ilha Solteira, São Paulo, Brazil
| | - P.C. Ceresini
- UNESP-University of São Paulo State, Av. Brasil no. 56, 15385-000, Ilha Solteira, São Paulo, Brazil
| | | | - G. Coelho
- Departamento de Fundamentos da Educação, CCR, Universidade Federal de Santa Maria, Av. Roraima n°1000, Campus, Bairro Camobi, CEP 97105-900, Santa Maria, RS, Brasil
| | - V.R.M. Coimbra
- Departamento de Micologia, Centro de Ciências Biológicas, Universidade Federal de Pernambuco, Av. Prof. Nelson Chaves, s/n, 50670-901 Recife, Pernambuco, Brazil
| | - L.A. Costa
- Departamento de Ciências Biológicas, Universidade Estadual de Feira de Santana, Av. Transnordestina s/n, Novo Horizonte, 44036-900, Feira de Santana, BA, Brazil
| | - K.C. da Cunha
- Dermatology Laboratory (SML), University Hospital of Geneva, Rue Gabrielle Perret-Gentil 4, 1205 Genève, Geneva, Switzerland
| | - S.S. da Silva
- Departamento de Ciências Biológicas, Universidade Estadual de Feira de Santana, Av. Transnordestina s/n, Novo Horizonte, 44036-900, Feira de Santana, BA, Brazil
| | - R. Daniel
- Elizabeth Macarthur Agricultural Institute, Department of Primary Industries, Private Bag 4008, Narellan 2567, Australia
| | - Z.W. de Beer
- Department of Microbiology and Plant Pathology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, P. Bag X20, Pretoria 0028, South Africa
| | - M. Dueñas
- Departamento de Micología, Real Jardín Botánico-CSIC, Plaza de Murillo 2, 28014 Madrid, Spain
| | - J. Edwards
- AgriBio Centre for AgriBiosciences, Department of Economic Development, Jobs, Transport and Resources, 5 Ring Road, LaTrobe University, Bundoora, Victoria 3083 Australia
| | - P. Enwistle
- North East Agricultural Services, McLeans Ridges 2480, NSW, Australia
| | - P.O. Fiuza
- Departamento de Ciências Biológicas, Universidade Estadual de Feira de Santana, Av. Transnordestina s/n, Novo Horizonte, 44036-900, Feira de Santana, BA, Brazil
| | | | - D. García
- Mycology Unit, Medical School and IISPV, Universitat Rovira i Virgili (URV), Sant Llorenç 21, 43201 Reus, Tarragona, Spain
| | - T.B. Gibertoni
- Departamento de Micologia, Centro de Ciências Biológicas, Universidade Federal de Pernambuco, Av. Prof. Nelson Chaves, s/n, 50670-901 Recife, Pernambuco, Brazil
| | - S. Giraud
- GEIHP - EA 3142, Université d’Angers, Institut de Biologie en Santé PBH-IRIS CHU, 4 Rue Larrey, 49933 Angers Cedex 9, France
| | - M. Guevara-Suarez
- Mycology Unit, Medical School and IISPV, Universitat Rovira i Virgili (URV), Sant Llorenç 21, 43201 Reus, Tarragona, Spain
| | - L.F.P. Gusmão
- Departamento de Ciências Biológicas, Universidade Estadual de Feira de Santana, Av. Transnordestina s/n, Novo Horizonte, 44036-900, Feira de Santana, BA, Brazil
| | - S. Haituk
- Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand
| | - M. Heykoop
- Departamento de Ciencias de la Vida (Unidad Docente de Botánica), Universidad de Alcalá, E-28805 Alcalá de Henares, Madrid, Spain
| | - Y. Hirooka
- Biodiversity (Mycology), Agriculture and Agri-Food Canada, Ottawa, ON, K1A 0C6, Canada; Department of Clinical Plant Science, Faculty of Bioscience, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo, Japan
| | - T.A. Hofmann
- Herbarium UCH, Mycological Research Center (CIMi), Autonomous University of Chiriquí (UNACHI), 0427, David, Chiriquí Province, Panama
| | - J. Houbraken
- CBS-KNAW Fungal Biodiversity Centre, P.O. Box 85167, 3508 AD Utrecht, The Netherlands
| | - D.P. Hughes
- Center of Infectious Disease Dynamics, Millennium Science Complex, University Park Campus, Pennsylvania State University, USA
| | - I. Kautmanová
- Slovak National Museum-Natural History Museum, P.O. Box 13, 810 06 Bratislava, Slovakia
| | - O. Koppel
- Biodiversity (Mycology), Agriculture and Agri-Food Canada, Ottawa, ON, K1A 0C6, Canada; Department of Biology, University of Ottawa, 30 Marie-Curie, Ottawa, ON K1N 6N5, Canada
| | - O. Koukol
- Department of Botany, Faculty of Science, Charles University, Benátská 2, CZ-12801, Praha 2, Czech Republic
| | - E. Larsson
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 463, 405 30 Göteborg, Sweden
| | - K.P.D. Latha
- Department of Botany, University of Calicut, Kerala, 673 635, India
| | - D.H. Lee
- Department of Genetics, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, P. Bag X20, Pretoria 0002, South Africa
| | - D.O. Lisboa
- Departamento de Fitopatologia, Universidade Federal de Viçosa, Viçosa, 36570-900, MG, Brazil
| | - W.S. Lisboa
- Departamento de Fitopatologia, Universidade Federal de Viçosa, Viçosa, 36570-900, MG, Brazil
| | - Á. López-Villalba
- Departamento de Ciencias de la Vida (Unidad Docente de Botánica), Universidad de Alcalá, E-28805 Alcalá de Henares, Madrid, Spain
| | - J.L.N. Maciel
- Brazilian Agriculture Research Corporation-Wheat (EMBRAPA-Trigo), Caixa Postal 3081, Rodovia BR-285 Km 294, 99050-970 Passo Fundo, Rio Grande do Sul, Brazil
| | - P. Manimohan
- Department of Botany, University of Calicut, Kerala, 673 635, India
| | - J.L. Manjón
- Departamento de Ciencias de la Vida (Unidad Docente de Botánica), Universidad de Alcalá, E-28805 Alcalá de Henares, Madrid, Spain
| | - S. Marincowitz
- Department of Microbiology and Plant Pathology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, P. Bag X20, Pretoria 0028, South Africa
| | - T.S. Marney
- Department of Agriculture and Fisheries, GPO Box 267, Brisbane 4001, Queensland, Australia
| | - M. Meijer
- CBS-KNAW Fungal Biodiversity Centre, P.O. Box 85167, 3508 AD Utrecht, The Netherlands
| | - A.N. Miller
- University of Illinois Urbana-Champaign, Illinois Natural History Survey, 1816 South Oak Street, Champaign, Illinois, 61820, USA
| | - I. Olariaga
- University of the Basque Country (UPV/EHU), Apdo. 644, E-48080 Bilbao, Spain
| | - L.M. Paiva
- Departamento de Micologia Prof. Chaves Batista, Universidade Federal de Pernambuco, Recife, Brazil
| | - M. Piepenbring
- Department of Mycology, Cluster for Integrative Fungal Research (IPF), Institute for Ecology, Evolution and Diversity, Goethe University, Max-von-Laue-Str. 13, DE-60438 Frankfurt am Main, Germany
| | | | - K.N.A. Raj
- Department of Botany, University of Calicut, Kerala, 673 635, India
| | - H.A. Raja
- University of North Carolina, Department of Chemistry and Biochemistry, Greensboro, North Carolina, 27402, USA
| | - A. Rougeron
- GEIHP - EA 3142, Université d’Angers, Institut de Biologie en Santé PBH-IRIS CHU, 4 Rue Larrey, 49933 Angers Cedex 9, France
| | - I. Salcedo
- University of the Basque Country (UPV/EHU), Apdo. 644, E-48080 Bilbao, Spain
| | - R. Samadi
- Plant Protection Department, Faculty of Agriculture, University of Tabriz, P.O. Box 5166614766, Tabriz, Iran
| | - T.A.B. Santos
- Departamento de Ciências Biológicas, Universidade Estadual de Feira de Santana, Av. Transnordestina s/n, Novo Horizonte, 44036-900, Feira de Santana, BA, Brazil
| | - K. Scarlett
- Faculty of Agriculture and Environment, The University of Sydney, Sydney 2006, Australia
| | - K.A. Seifert
- Biodiversity (Mycology), Agriculture and Agri-Food Canada, Ottawa, ON, K1A 0C6, Canada; Department of Biology, University of Ottawa, 30 Marie-Curie, Ottawa, ON K1N 6N5, Canada
| | - L.A. Shuttleworth
- Elizabeth Macarthur Agricultural Institute, Department of Primary Industries, Private Bag 4008, Narellan 2567, Australia
| | - G.A. Silva
- Departamento de Micologia Prof. Chaves Batista, Universidade Federal de Pernambuco, Recife, Brazil
| | - M. Silva
- Departamento de Fitopatologia, Universidade Federal de Viçosa, Viçosa, 36570-900, MG, Brazil
| | - J.P.Z. Siqueira
- Mycology Unit, Medical School and IISPV, Universitat Rovira i Virgili (URV), Sant Llorenç 21, 43201 Reus, Tarragona, Spain
| | - C.M. Souza-Motta
- Departamento de Micologia Prof. Chaves Batista, Universidade Federal de Pernambuco, Recife, Brazil
| | - S.L. Stephenson
- Department of Biological Sciences, University of Arkansas, Fayetteville, Arkansas 72701, USA
| | - D.A. Sutton
- Fungus Testing Laboratory, Department of Pathology, University of Texas Health Science Center, 7703 Floyd Curl Dr., San Antonio, Texas 78229-3900, USA
| | - N. Tamakeaw
- Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand
| | - M.T. Telleria
- Departamento de Micología, Real Jardín Botánico-CSIC, Plaza de Murillo 2, 28014 Madrid, Spain
| | - N. Valenzuela-Lopez
- Mycology Unit, Medical School and IISPV, Universitat Rovira i Virgili (URV), Sant Llorenç 21, 43201 Reus, Tarragona, Spain
| | - A. Viljoen
- Department of Plant Pathology, University of Stellenbosch, Private Bag X1, Stellenbosch 7602, South Africa
| | - C.M. Visagie
- Biodiversity (Mycology), Agriculture and Agri-Food Canada, Ottawa, ON, K1A 0C6, Canada; Department of Biology, University of Ottawa, 30 Marie-Curie, Ottawa, ON K1N 6N5, Canada
| | - A. Vizzini
- Department of Life Sciences and Systems Biology, University of Torino, Viale P.A. Mattioli 25, I-10125 Torino, Italy
| | - F. Wartchow
- Departamento de Sistemática e Ecologia, Centro de Ciências Exatas e da Natureza, Universidade Federal da Paraíba, 58051-900 João Pessoa, Paraíba, Brazil
| | - B.D. Wingfield
- Department of Genetics, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, P. Bag X20, Pretoria 0002, South Africa
| | - E. Yurchenko
- Department of Biotechnology, Paleski State University, Dnyaprouskai flatylii str. 23, BY-225710, Pinsk, Belarus
| | - J.C. Zamora
- Departamento de Biología Vegetal II, Facultad de Farmacia, Universidad Complutense de Madrid, Madrid, Spain
| | - J.Z. Groenewald
- CBS-KNAW Fungal Biodiversity Centre, P.O. Box 85167, 3508 AD Utrecht, The Netherlands
| |
Collapse
|
44
|
Rose LJ, Mouton M, Beukes I, Flett BC, van der Vyver C, Viljoen A. Multi-environment Evaluation of Maize Inbred Lines for Resistance to Fusarium Ear Rot and Fumonisins. Plant Dis 2016; 100:2134-2144. [PMID: 30683004 DOI: 10.1094/pdis-11-15-1360-re] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Fusarium verticillioides causes Fusarium ear rot (FER) of maize and produces fumonisins, which affects grain quality. Host-plant resistance can reduce both FER and fumonisins in maize. In this study, 18 maize inbred lines were evaluated for resistance to F. verticillioides and fumonisin accumulation at five localities in South Africa. Additive main effects and multiplicative interaction analyses revealed significant environment × genotype interactions, with inbred lines CML 390, US 2540W, RO 424W, and VO 617y-2 consistently exhibiting low FER severity (≤5.4%), fungal target DNA (≤0.1 ng μl-1), and fumonisin levels (≤5.6 ppm). Genotype main effect and genotype × environment biplots showed that inbred lines CML 390, US 2540W, and RO 424W were most resistant to FER, fungal colonization, and fumonisin accumulation, respectively, while inbred line RO 424W was most stable in its resistance response over environments. These inbred lines also demonstrated broad adaptability by consistently exhibiting resistance to FER, fungal colonization, and fumonisins across localities. The identified lines could serve as valuable sources of resistance against F. verticillioides and its fumonisins in local breeding programs.
Collapse
Affiliation(s)
- L J Rose
- Department of Plant Pathology, Stellenbosch University, Matieland 7602, South Africa
| | - M Mouton
- Department of Plant Pathology, Stellenbosch University, Matieland 7602, South Africa
| | - I Beukes
- Department of Plant Pathology, Stellenbosch University, Matieland 7602, South Africa
| | - B C Flett
- Grain Crops Institute, Agricultural Research Council, Potchefstroom 2520, South Africa
| | | | - A Viljoen
- Department of Plant Pathology, Stellenbosch University
| |
Collapse
|
45
|
Gratwick Z, Viljoen A, Page PC, Goddard A, Fosgate GT, Lyle CH. A comparison of the effects of a 4% modified fluid gelatin and a 6% hydroxyethyl starch on haemodilution, colloid osmotic pressure, haemostasis and renal parameters in healthy ponies. Equine Vet J 2016; 49:363-368. [DOI: 10.1111/evj.12594] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2015] [Accepted: 05/18/2016] [Indexed: 11/30/2022]
Affiliation(s)
- Z. Gratwick
- Department of Companion Animal Clinical Studies; Faculty of Veterinary Science; University of Pretoria; Onderstepoort South Africa
| | - A. Viljoen
- Department of Companion Animal Clinical Studies; Faculty of Veterinary Science; University of Pretoria; Onderstepoort South Africa
| | - P. C. Page
- Department of Companion Animal Clinical Studies; Faculty of Veterinary Science; University of Pretoria; Onderstepoort South Africa
| | - A. Goddard
- Department of Companion Animal Clinical Studies; Faculty of Veterinary Science; University of Pretoria; Onderstepoort South Africa
| | - G. T. Fosgate
- Department of Companion Animal Clinical Studies; Faculty of Veterinary Science; University of Pretoria; Onderstepoort South Africa
| | - C. H. Lyle
- Department of Companion Animal Clinical Studies; Faculty of Veterinary Science; University of Pretoria; Onderstepoort South Africa
| |
Collapse
|
46
|
Abstract
CONTEXT Xysmalobium undulatum (L.) Aiton f var. (Asclepiadaceae), commonly known as uzara, is an ethnomedicinally important plant from southern Africa used to treat a variety of ailments. In addition to local use in African Traditional Medicine (ATM), formulations containing uzara have been successfully marketed by a number of pharmaceutical companies. Despite its commercialization, published adequate quality control (QC) protocols are lacking. OBJECTIVE The study was conducted to develop QC protocols for uzara based on chromatographic and spectroscopic techniques. MATERIALS AND METHODS High performance thin layer chromatography (HPTLC) and liquid chromatography coupled to mass spectrometry (LC-MS) were used to develop phytochemical fingerprints of ethanolic root extracts of 47 uzara samples collected from eight distinct localities in South Africa. Mid-infrared (MIR) spectroscopy was also explored as a suitable alternative technique for rapid and economic quantification of uzarin. RESULTS Adequate chromatographic profiles were obtained using both HPTLC and LC-MS analyses. The chromatographic patterns showed qualitative similarities among plants collected from different locations. The levels of uzarin, the major constituent of uzara, were highly variable between locations, ranging from 17.8 to 139.9 mg/g (dry weight). A good coefficient of determination (R(2 )= 0.939) and low root mean square error of prediction (RMSEP = 7.9 mg/g) confirmed the accuracy of using MIR-PLS calibration models for the quantification of uzarin. DISCUSSION AND CONCLUSION Both HPTLC and LC-MS can be used as tools in developing quality control procedures for uzara. MIR in combination with chemometrics provides a fast alternative method for the quantification of uzarin.
Collapse
Affiliation(s)
- Sowesa Kanama
- a Department of Pharmaceutical Sciences , Faculty of Science, Tshwane University of Technology , Pretoria , South Africa
| | - Alvaro Viljoen
- a Department of Pharmaceutical Sciences , Faculty of Science, Tshwane University of Technology , Pretoria , South Africa
- b SAMRC Herbal Drugs Research Unit, Faculty of Science, Tshwane University of Technology , Pretoria , South Africa , and
- c Department of Pharmaceutics and Industrial Pharmacy , Faculty of Pharmacy, King Abdulaziz University , Jeddah , Saudi Arabia
| | - Gill Enslin
- a Department of Pharmaceutical Sciences , Faculty of Science, Tshwane University of Technology , Pretoria , South Africa
| | - Guy Kamatou
- a Department of Pharmaceutical Sciences , Faculty of Science, Tshwane University of Technology , Pretoria , South Africa
| | - Weiyang Chen
- a Department of Pharmaceutical Sciences , Faculty of Science, Tshwane University of Technology , Pretoria , South Africa
| | - Maxleene Sandasi
- a Department of Pharmaceutical Sciences , Faculty of Science, Tshwane University of Technology , Pretoria , South Africa
| | - Thomas Idowu
- a Department of Pharmaceutical Sciences , Faculty of Science, Tshwane University of Technology , Pretoria , South Africa
| |
Collapse
|
47
|
Tankeu S, Vermaak I, Chen W, Sandasi M, Viljoen A. Differentiation between two "fang ji" herbal medicines, Stephania tetrandra and the nephrotoxic Aristolochia fangchi, using hyperspectral imaging. Phytochemistry 2016; 122:213-222. [PMID: 26632529 DOI: 10.1016/j.phytochem.2015.11.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Revised: 11/09/2015] [Accepted: 11/14/2015] [Indexed: 05/14/2023]
Abstract
Stephania tetrandra ("hang fang ji") and Aristolochia fangchi ("guang fang ji") are two different plant species used in Traditional Chinese Medicine (TCM). Both are commonly referred to as "fang ji" and S. tetrandra is mistakenly substituted and adulterated with the nephrotoxic A. fangchi as they have several morphological similarities. A. fangchi contains aristolochic acid, a carcinogen that causes urothelial carcinoma as well as aristolochic acid nephropathy (AAN). In Belgium, 128 cases of AAN was reported while in China, a further 116 cases with end-stage renal disease were noted. Toxicity issues associated with species substitution and adulteration necessitate the development of reliable methods for the quality assessment of herbal medicines. Hyperspectral imaging in combination with partial least squares discriminant analysis (PLS-DA) is suggested as an effective method to distinguish between S. tetrandra and A. fangchi root powder. Hyperspectral images were obtained in the wavelength region of 920-2514nm. Reduction of the dimensionality of the data was done by selecting the discrimination information range (964-1774nm). A discrimination model with a coefficient of determination (R(2)) of 0.9 and a root mean square error of prediction (RMSEP) of 0.23 was created. The constructed model successfully identified A. fangchi and S. tetrandra samples inserted into the model as an external validation set. In addition, adulteration detection was investigated by preparing incremental adulteration mixtures of S. tetrandra with A. fangchi (10-90%). Hyperspectral imaging showed the ability to accurately predict adulteration as low as 10%. It is evident that hyperspectral imaging has tremendous potential in the development of visual quality control methods which may prevent cases of aristolochic acid nephropathy in the future.
Collapse
Affiliation(s)
- Sidonie Tankeu
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
| | - Ilze Vermaak
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa; SAMRC Herbal Drugs Research Unit, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa.
| | - Weiyang Chen
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
| | - Maxleene Sandasi
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa; SAMRC Herbal Drugs Research Unit, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
| |
Collapse
|
48
|
Komane B, Vermaak I, Summers B, Viljoen A. Safety and efficacy of Sclerocarya birrea (A.Rich.) Hochst (Marula) oil: A clinical perspective. J Ethnopharmacol 2015; 176:327-335. [PMID: 26528587 DOI: 10.1016/j.jep.2015.10.037] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Revised: 09/29/2015] [Accepted: 10/25/2015] [Indexed: 06/05/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Sclerocarya birrea (A.Rich.) Hochst (Marula) nut oil is a popular ingredient in cosmetics such as skin lotions, lipsticks and foundations. The demand for this African oil increased tremendously such that in 2008 almost US$ 20 million was spent on Marula oil for cosmetic product manufacturing. The ethnobotanical literature states that the Zulu people in South Africa amongst others applied the oil to maintain a healthy skin. Scientific studies to support the traditional use as well as the inclusion of Marula oil in cosmetic products is lacking. This study evaluated the irritancy potential (safety), the moisturising and hydrating effects as well occlusivity properties (efficacy) of Marula oil after topical application. In addition, the Marula oil used in this study was comprehensively characterised using two-dimensional gas chromatography coupled to mass spectrometry. METHODS AND MATERIALS Quantification of the fatty acid methyl esters (FAMEs) was done using a LECO Pegasus 4D GC × GC-MS. To determine the safety and efficacy of Marula oil healthy caucasian adult female volunteers (n = 20) who complied with the inclusion and exclusion criteria for the irritancy patch, moisture efficacy, hydrating and occlusivity tests were recruited for each study. A 2 × magnifying lamp (visual observation), Chromameter®, Aquaflux® and Corneometer® instruments were used to evaluate and monitor the irritancy level, skin barrier function, transepidermal water loss, hydrating and occlusive effects of topically applied Marula oil. RESULTS The GC × GC-MS analysis identified several saturated as well as unsaturated fatty acids. Oleic acid was the major fatty acid constituting 69.0% of the oil followed by palmitic acid (15.3%), linoleic acid (9.2%), palmitoleic acid (4.1%) and stearic acid (1.5%). The clinical study revealed that Marula oil is non-irritant (p < 0.001), with moisturising and hydrating properties (p < 0.001) when applied to a lipid-dry (xerosis) skin. Additionally the oil exhibited occlusive effects (p < 0.001) when applied to normal skin. These findings may be linked to the absorption of the oil into the skin due to the high percentage of oleic acid and the presence of palmitic acid which are known to disturb the stratum corneum intercellular lipids. These fatty acids present in Marula oil are very similar to those present in the epidermis, and can be considered biomimetic. CONCLUSIONS Marula oil rich in fatty acids exhibits moisturising, hydrating and occlusive properties. As the oil is non-irritating and provides a moisturising effect with moderate prevention of transepidermal water loss, average moisture retention properties and noteworthy occlusive effects, its inclusion in cosmetic products based on its traditional use may be justified depending on the application.
Collapse
Affiliation(s)
- Baatile Komane
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
| | - Ilze Vermaak
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa; SAMRC Herbal Drugs Research Unit, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
| | - Beverley Summers
- Department of Pharmacy, Photobiology Laboratory, Sefako Makgatho Health Sciences University, P.O. Box 218, Medunsa 0204, South Africa
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa; SAMRC Herbal Drugs Research Unit, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa.
| |
Collapse
|
49
|
Viljoen A, Cyrus D. A preliminary investigation of the effects of an Inter Basin Transfer on the ichthyofauna of a small river in northern KwaZulu-Natal,South Africa. African Zoology 2015. [DOI: 10.1080/15627020.2003.11657206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
50
|
Nsuala BN, Enslin G, Viljoen A. "Wild cannabis": A review of the traditional use and phytochemistry of Leonotis leonurus. J Ethnopharmacol 2015; 174:520-539. [PMID: 26292023 DOI: 10.1016/j.jep.2015.08.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Revised: 08/14/2015] [Accepted: 08/15/2015] [Indexed: 06/04/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Leonotis leonurus, locally commonly known as "wilde dagga" (=wild cannabis), is traditionally used as a decoction, both topically and orally, in the treatment of a wide variety of conditions such as haemorrhoids, eczema, skin rashes, boils, itching, muscular cramps, headache, epilepsy, chest infections, constipation, spider and snake bites. The dried leaves and flowers are also smoked to relieve epilepsy. The leaves and flowers are reported to produce a mild euphoric effect when smoked and have been said to have a similar, although less potent, psychoactive effect to cannabis. AIM OF THE REVIEW To amalgamate the botanical aspects, ethnopharmacology, phytochemistry, biological activity, toxicity and commercial aspects of the scientific literature available on L. leonurus. METHODS An extensive review of the literature from 1900 to 2015 was carried out. Electronic databases including Scopus, SciFinder, Pubmed, Google Scholar and Google were used as data sources. All abstracts, full-text articles and books written in English were considered. RESULTS The phytochemistry of particularly the non-volatile constituents of L. leonurus has been comprehensively investigated due to interest generated as a result of the wide variety of biological effects reported for this plant. More than 50 compounds have been isolated and characterised. L. leonurus contains mainly terpenoids, particularly labdane diterpenes, the major diterpene reported is marrubiin. Various other compounds have been reported by some authors to have been isolated from the plant, including, in the popular literature only, the mildly psychoactive alkaloid, leonurine. Leonurine has however, never been reported by any scientific analysis of the extracts of L. leonurus. CONCLUSION Despite the publication of various papers on L. leonurus, there is still, however, the need for definitive research and clarification of other compounds, including alkaloids and essential oils from L. leonurus, as well as from other plant parts, such as the roots which are extensively used in traditional medicine. The traditional use by smoking also requires further investigation as to how the chemistry and activity are affected by this form of administration. Research has proven the psychoactive effects of the crude extract of L. leonurus, but confirmation of the presence of psychoactive compounds, as well as isolation and characterization, is still required. Deliberate adulteration of L. leonurus with synthetic cannabinoids has been reported recently, in an attempt to facilitate the marketing of these illegal substances, highlighting the necessity for refinement of appropriate quality control processes to ensure safety and quality. Much work is therefore still required on the aspect of quality control to ensure safety, quality and efficacy of the product supplied to patients, as this plant is widely used in South Africa as a traditional medicine. Commercially available plant sources provide a viable option for phytochemical research, particularly with regard to the appropriate validation of the plant material (taxonomy) in order to identify and delimit closely related species such as L. leonurus and L. nepetifolia which are very similar in habit.
Collapse
Affiliation(s)
- Baudry N Nsuala
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - Gill Enslin
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa.
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa; SAMRC Herbal Drugs Research Unit, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| |
Collapse
|