1
|
Malarz J, Michalska K, Galanty A, Kiss AK, Stojakowska A. Constituents of Pulicaria inuloides and Cytotoxic Activities of Two Methoxylated Flavonols. Molecules 2023; 28:molecules28020480. [PMID: 36677535 PMCID: PMC9866601 DOI: 10.3390/molecules28020480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 12/26/2022] [Accepted: 12/26/2022] [Indexed: 01/05/2023] Open
Abstract
Plants of the genus Pulicaria are known for providing traditional medicines, spices, herbal teas, and insect deterrents. Pulicaria inuloides (Poir.). DC. is one of the less chemically studied species within the genus. Hydroalcoholic extracts from roots and aerial parts of P. inuloides were analyzed using the UHPLC-PAD-MSn technique and revealed the presence of six caffeoylquinic and eleven caffeoylhexaric conjugates together with hydroxykaempferol dimethyl ether and quercetagetin trimethyl ether. Moreover, constituents of chloroform extract from the whole P. inuloides plants were isolated and identified by spectroscopic methods. One new and four known caryophyllene derivatives, three thymol derivatives, and four polymethoxylated flavonols were found in the analyzed extract. The structure of the new compound was established by spectroscopic methods (HRESIMS, 1H NMR, 13C NMR, COSY, HSQC, HMBC, NOESY). The cytotoxicity of 6-Hydroxykaempferol 3,7-dimethyl ether and quercetagetin 3,7,3’-trimethyl ether (chrysosplenol C), which are major flavonols isolated from the plant, were tested on prostate epithelial cells (PNT2), prostate cancer cells (DU145 and PC3), human keratinocytes (HaCaT), and melanoma cells (HTB140 and A375). Both flavonols demonstrated moderate cytotoxic activity against PC3 cells (IC50 = 59.5 µM and 46.6 µM, respectively). The remaining cell lines were less affected (IC50 > 150 µM).
Collapse
Affiliation(s)
- Janusz Malarz
- Maj Institute of Pharmacology, Polish Academy of Sciences, Smętna Street 12, 31-343 Kraków, Poland
| | - Klaudia Michalska
- Maj Institute of Pharmacology, Polish Academy of Sciences, Smętna Street 12, 31-343 Kraków, Poland
| | - Agnieszka Galanty
- Department of Pharmacognosy, Jagiellonian University Medical College, Medyczna Street 9, 30-688 Kraków, Poland
| | - Anna Karolina Kiss
- Department of Pharmacognosy and Molecular Basis of Phytotherapy, Medical University of Warsaw, 1 Banacha Street, 02-097 Warsaw, Poland
| | - Anna Stojakowska
- Maj Institute of Pharmacology, Polish Academy of Sciences, Smętna Street 12, 31-343 Kraków, Poland
- Correspondence: ; Tel.: +48-12-662-32-54
| |
Collapse
|
2
|
Kenny CR, Stojakowska A, Furey A, Lucey B. From Monographs to Chromatograms: The Antimicrobial Potential of Inula Helenium L. (Elecampane) Naturalised in Ireland. Molecules 2022; 27:molecules27041406. [PMID: 35209195 PMCID: PMC8874828 DOI: 10.3390/molecules27041406] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 02/12/2022] [Accepted: 02/16/2022] [Indexed: 12/10/2022] Open
Abstract
With antimicrobial resistance rising globally, the exploration of alternative sources of candidate molecules is critical to safeguard effective chemotherapeutics worldwide. Plant natural products are accessible, structurally diverse compounds with antimicrobial potential. The pharmacological applications of plants in medicine can be guided by the attestation of traditional use, as demonstrated in this study. In Irish ethnomedical literature, Inula helenium L. (elecampane) is often indicated for respiratory and dermal ailments. This is the first assessment of antimicrobial sesquiterpene lactones from the roots of elecampane, naturalised in Ireland. Traditional hydro-ethanolic extracts were prepared from multi-origin elecampane roots. A novel clean-up strategy facilitated the bioactivity-guided fractionation of a subset of anti-staphylococcal fractions (the compositions of which were investigated using HPLC-DAD, supported by 1H NMR). The natural products attributing to the antimicrobial activity, observed in vitro, were identified as alantolactone (1), isoalantolactone (2), igalan (3), and an unseparated mixture of dugesialactone (4) and alloalantolactone (5), as major compounds. The findings suggest that the geographical origin of the plant does not influence the anti-bacterial potency nor the chemical composition of traditional elecampane root. Considering the prevalence of staphylococci-associated infections and associated broad spectrum resistance in Irish hospitals, currently, further research is warranted into the usage of the identified compounds as potential candidates in the control of staphylococcal carriage and infection.
Collapse
Affiliation(s)
- Ciara-Ruth Kenny
- Centre for Research in Advanced Therapeutic Engineering and BioExplore, Department of Biological Sciences, Munster Technological University, Rossa Avenue, Bishopstown, T12 P928 Cork, Ireland; (C.-R.K.); (A.F.)
| | - Anna Stojakowska
- Maj Institute of Pharmacology, Polish Academy of Sciences, 31-343 Kraków, Poland;
| | - Ambrose Furey
- Centre for Research in Advanced Therapeutic Engineering and BioExplore, Department of Biological Sciences, Munster Technological University, Rossa Avenue, Bishopstown, T12 P928 Cork, Ireland; (C.-R.K.); (A.F.)
- Mass Spectrometry Group, Department of Physical Sciences, Munster Technological University, Rossa Avenue, Bishopstown, T12 P928 Cork, Ireland
| | - Brigid Lucey
- Centre for Research in Advanced Therapeutic Engineering and BioExplore, Department of Biological Sciences, Munster Technological University, Rossa Avenue, Bishopstown, T12 P928 Cork, Ireland; (C.-R.K.); (A.F.)
- Correspondence: ; Tel.: +353-21-4335484
| |
Collapse
|
3
|
Electrophilic thymol isobutyrate from Inula nervosa Wall. (Xiaoheiyao) ameliorates steatosis in HepG2 cells via Nrf2 activation. J Funct Foods 2022. [DOI: 10.1016/j.jff.2021.104895] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
|
4
|
Wajs-Bonikowska A, Malarz J, Stojakowska A. Composition of Essential Oils from Roots and Aerial Parts of Carpesium divaricatum, a Traditional Herbal Medicine and Wild Edible Plant from South-East Asia, Grown in Poland. Molecules 2019; 24:molecules24234418. [PMID: 31816933 PMCID: PMC6930655 DOI: 10.3390/molecules24234418] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 11/29/2019] [Accepted: 12/02/2019] [Indexed: 11/16/2022] Open
Abstract
Carpesium divaricatum Sieb. and Zucc. has long been used both as traditional medicine and seasonal food. The most extensively studied specialized metabolites synthesized by the plant are sesquiterpene lactones of germacrane-type. Low-molecular and volatile terpenoids produced by C. divaricatum, however, have never been explored. In this work, compositions of essential oils distilled from roots and shoots of C. divaricatum plants, cultivated either in the open field or in the glasshouse have been studied by GC-MS-FID supported by NMR spectroscopy. The analyses led to the identification of 145 compounds in all, 112 of which were localized in aerial parts and 80 in roots of the plants grown in the open field. Moreover, remarkable differences in composition of oils produced by aerial and underground parts of C. divaricatum have been observed. The major volatiles found in the shoots were: α-pinene (40%), nerol (4%) and neryl-isobutyrate (3%), whereas predominant components of the root oil were 10-isobutyryloxy-8,9-epoxythymyl-isobutyrate (29%), thymyl-isobutyrate (6%) and 9-isobutyryloxythymyl-isobutyrate (6%). In the analyzed oils, seventeen thymol derivatives were identified. Among them eight compounds were specific for roots. Roots of the plants cultivated in the glasshouse were, in general, a poor source of essential oil in comparison with those of the plants grown in the open field. Chemophenetic relationships with other taxa of the Inuleae-Inulineae were also briefly discussed.
Collapse
Affiliation(s)
- Anna Wajs-Bonikowska
- Institute of General Food Chemistry, Faculty of Biotechnology and Food Sciences, Łódź University of Technology, Stefanowskiego street 4/10, 90-924 Łódź, Poland;
| | - Janusz Malarz
- Maj Institute of Pharmacology, Polish Academy of Sciences, Department of Phytochemistry, Smętna street 12, 31-343 Kraków, Poland;
| | - Anna Stojakowska
- Maj Institute of Pharmacology, Polish Academy of Sciences, Department of Phytochemistry, Smętna street 12, 31-343 Kraków, Poland;
- Correspondence: ; Tel.: +481-26-623-254
| |
Collapse
|
5
|
Wang J, Zhao YM, Zhang ML, Shi QW. Simultaneous Determination of Chlorogenic Acid, Caffeic Acid, Alantolactone and Isoalantolactone in Inula helenium by HPLC. J Chromatogr Sci 2014; 53:526-30. [DOI: 10.1093/chromsci/bmu079] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
6
|
Bustos-Brito C, Sánchez-Castellanos M, Esquivel B, Calderón JS, Calzada F, Yepez-Mulia L, Hernández-Barragán A, Joseph-Nathan P, Cuevas G, Quijano L. Structure, absolute configuration, and antidiarrheal activity of a thymol derivative from Ageratina cylindrica. JOURNAL OF NATURAL PRODUCTS 2014; 77:358-363. [PMID: 24502360 DOI: 10.1021/np400964w] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The leaves of Ageratina cylindrica afforded a thymol derivative that was characterized by physical and spectroscopical methods as (8S)-8,9-epoxy-6-hydroxy-l0-benzoyloxy-7-oxothymol isobutyrate (1). The absolute configuration of 1 was established as 8S by vibrational circular dichroism spectroscopy in combination with density functional theory calculations and by evaluation of the Flack and Hooft X-ray parameters. Compound 1 showed weak antiprotozoal activity against Entamoeba histolytica and Giardia lamblia trophozoites and a high inhibitory effect on hyperpropulsive movement of the small intestine in rats.
Collapse
Affiliation(s)
- Celia Bustos-Brito
- Instituto de Química, Universidad Nacional Autónoma de México , Circuito Exterior, Ciudad Universitaria, D.F., 04510 México
| | | | | | | | | | | | | | | | | | | |
Collapse
|
7
|
Abstract
AbstractThe objective of the paper was to investigate the chemical composition of Inula helenium roots extracts and to evaluate the antioxidant potential conferred by the chemical constituents. GC/MS and HPLC/MS techniques were used to characterize two extracts separated from Inula helenium roots by extraction with chloroform and ethyl acetate, respectively. Volatile compounds have been identified by GC from their mass spectra and retention time values, while HPLC identification of phenolic compounds was realized by comparing their retention times, UV and MS spectra with those of standards or literature data. Measurements of antioxidant activity of Inula helenium root extracts showed a variation between them, which can be correlated with the flavonoid and total phenolic contents. Both Inula helenium root extracts contain phenolic acids (caffeic, chlorogenic, dicaffeoyl quinic, hydroxibenzoic), terpenes (alantolactone) and different flavonoids (epicatechin, catechin gallate, ferulic acid-4-O-glucoside, dihydroquercetin pentosyl rutinoside, kaempherol-7-O-dipentoside, quercetin-3-O-β-glucopyranoside). In addition, the study provides preliminary data on the anti-inflammatory activity of Inula helenium root extracts, this being evaluated using the fresh egg albumin as phlogistic agent, and aspirin as reference compound. Root extracts of I. helenium did not exert any significant anti-inflammatory effect on egg albumin-induced rat paw edema.
Collapse
|
8
|
Arumugam P, Murugan M. Antimutagenic and Antiapoptotic Effects of Aqueous Root Extract of Inula racemosa Hook. f. on 4-NQO-Induced Genetic Damage in Mice. ISRN PHARMACOLOGY 2013; 2013:768359. [PMID: 24078879 PMCID: PMC3775395 DOI: 10.1155/2013/768359] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Accepted: 07/24/2013] [Indexed: 06/02/2023]
Abstract
The present study was performed as part of an attempt to authenticate the use of Inula racemosa root extract as traditional medicine in India by experimentally investigating their protective effects on 4-nitroquinoline-1-oxide (4-NQO) induced DNA damage and apoptosis in mice bone marrow cells. Aqueous root extract (ARE) of Inula racemosa (100, 200 and 400 mg/kg bw) with and without 4-NQO along with vehicle control (H2O) were administered orally for five consecutive days. 4-NQO (7.5 mg/kg bw) was injected intraperitoneally to the mice on the sixth day. After 24 h, the animals were sacrificed and extracted bone marrow cells were used for micronuclei and apoptotic analysis. Antiapoptotic effect of ARE (400 mg/kg bw) was measured by the use of Annexin V-FITC assay kit. 4-NQO generated the frequency of micronucleated polychromatic erythrocytes (MnPCEs) by about 4.7 times the control value, 14.29 MnPCEs/2500 PCEs. Pretreatment with ARE significantly reduced the MnPCEs frequency (39-72%) with respect to their doses, and increased PCEs/NCEs ratio was observed over the 4-NQO alone. 4-NQO-induced total apoptotic cells were about 12% over the control which was significantly (P < 0.05) brought down to 3.5% by pretreatment with 400 mg/kg bw of ARE. This was the first report that recorded the protective effects of I. racemosa on 4-NQO-induced DNA damage and apoptosis in mice bone marrow cells.
Collapse
Affiliation(s)
- P. Arumugam
- Centre for Advanced Studies in Botany, School of Life Science, University of Madras, Guindy, Chennai, Tamil Nadu 600 113, India
| | - M. Murugan
- Department of Microbial Technology, School of Biological Science, Madurai Kamaraj University, Madurai, Tamil Nadu 625 021, India
| |
Collapse
|
9
|
Ultrasound-assisted extraction of total phenolic compounds from Inula helenium. ScientificWorldJournal 2013; 2013:157527. [PMID: 24089600 PMCID: PMC3760092 DOI: 10.1155/2013/157527] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Accepted: 07/07/2013] [Indexed: 11/20/2022] Open
Abstract
Ultrasound-assisted extraction (UAE) of phenolic compounds from Inula helenium was studied. Effects of ethanol concentration, ultrasonic time, solid-liquid ratio, and number of extractions were investigated. An orthogonal array was constructed to optimize UAE process. The optimized extraction conditions were as follows: ethanol concentration, 30%; solid-liquid ratio, 1 : 20; number of extractions, 2 times; extraction time, 30 min. Under the optimal conditions, the yield of total phenolic compounds and chlorogenic acid was 6.13 ± 0.58 and 1.32 ± 0.17 mg/g, respectively. The results showed that high amounts of phenolic compounds can be extracted from I. helenium by ultrasound-assisted extraction technology.
Collapse
|
10
|
Yan H, Haiming S, Cheng G, Xiaobo L. Chemical constituents of the roots of Inula helenium. Chem Nat Compd 2012. [DOI: 10.1007/s10600-012-0298-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
11
|
Stojanović-Radić Z, Comić L, Radulović N, Blagojević P, Denić M, Miltojević A, Rajković J, Mihajilov-Krstev T. Antistaphylococcal activity of Inula helenium L. root essential oil: eudesmane sesquiterpene lactones induce cell membrane damage. Eur J Clin Microbiol Infect Dis 2011; 31:1015-25. [PMID: 21901633 DOI: 10.1007/s10096-011-1400-1] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2011] [Accepted: 08/17/2011] [Indexed: 10/17/2022]
Abstract
The purpose of this study was to investigate the inhibitory/bactericidal activity and cell membrane effects of the hydrodistilled essential oil of Inula helenium L. roots against Staphylococcus aureus. Additionally, detailed chemical investigation was done in order to pinpoint the most active oil constituents and also the parts of these molecules responsible for their antimicrobial effect. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were determined using the broth microdilution method. The membrane-active nature of this oil was investigated by measuring the culture turbidity, leakage of phosphates, and 260-nm-absorbing material, together with lysis of the exposed cells. Finally, the effect of the oil on the cells was visualized using scanning electron microscopy (SEM). The chemical composition of the essential oil was analyzed using gas chromatography-mass spectrometry (GC-MS) and preparative medium-pressure liquid chromatography (MPLC). Chemical modification of the oil was performed using catalytic hydrogenation (H(2), Pd/C) and reduction with NaBH(4). The MIC and MBC values were 0.01 μl mL(-1) and 0.02 μl mL(-1), respectively. Membrane damage was demonstrated through increased permeability (phosphates and nucleic acid leakage), followed by lysis of the exposed cells, captured on SEM images. The most active constituents were alantolactone, isoalantolactone, and diplophyllin. The essential oil showed very potent antistaphylococcal activity, with obvious membrane-damaging effects. Sesquiterpene lactones were found to be the most active principles of the oil, whose eudesmane core olefinic bonds, along with the α,β-methylene-lactone ring, are essential structural parts responsible for the exhibited antimicrobial activity.
Collapse
Affiliation(s)
- Z Stojanović-Radić
- Department of Biology and Ecology, Faculty of Science and Mathematics, University of Niš, Višegradska 33, 18000, Niš, Serbia.
| | | | | | | | | | | | | | | |
Collapse
|
12
|
Pérez-Vásquez A, Capella S, Linares E, Bye R, Angeles-López G, Mata R. Antimicrobial activity and chemical composition of the essential oil of Hofmeisteria schaffneri. ACTA ACUST UNITED AC 2011; 63:579-86. [PMID: 21401611 DOI: 10.1111/j.2042-7158.2010.01243.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVES The aims of this study were to establish the antimicrobial potential of Hofmeisteria schaffneri essential oil and its chemical composition. METHODS The essential oils of Hofmeisteria schaffneri harvested at flowering (batches I and IV) and non-flowering (batches II and III) seasons were prepared by hydrodistillation and analysed by GC and GC-MS. The aqueous and organic (CH(2) Cl(2) -MeOH 1 : 1) extracts were prepared by using infusion and maceration techniques, respectively. The in-vitro antimicrobial activity of the preparations and compounds against Candida albicans and some bacteria (Gram-negative and Gram-positive) was assessed using the broth dilution method in 96-microplate wells. KEY FINDINGS Forty-four compounds, representing ∼90% of the total constituents, were identified in the essential oil of Hofmeisteria schaffneri collected in flowering (batches I and IV) and non-flowering (batches II and III) seasons. In all cases, several thymol analogues were the major components of the oils (∼65%); some small differences in the relative proportions of these constituents were observed. The infusion exhibited an antibacterial activity against Staphylococcus aureus and Bacillus subtilis, with a MIC value of 64 µg/ml in each case. The essential oil batches were active against Staphylococcus aureus, with MIC ranging from 48 to 192 µg/ml. They were, however, inactive against Gram-negative bacteria, including Pseudomonas aeruginosa, Escherichia coli and Salmonella typhi (MIC > 1024 µg/ml). On the other hand, the infusion of the plant as well as the oil from batch I displayed anti-Candida albicans activity, with MIC of 128 and 192 µg/ml, respectively. Finally, the organic extract did not displayed significant activity against the tested microorganisms (MIC ≥ 1024 µg/ml). Some of the compounds isolated from the plant were also tested. Compounds 8 and 38, which were present in the essential oils, displayed the best antibacterial effect against Gram-positive bacteria (MIC ranging between 32 and 64 µg/ml). Compounds 6 (present in the infusion) and 10 (present in all preparations) showed higher activity against the yeast (MIC = 128 µg/ml) than the remaining compounds, with MIC values ranging from 256 to 512 µg/ml. CONCLUSIONS The composition and antimicrobial activity of the oils changed slightly from flowering to non-flowering seasons. The results of the present investigation provide in-vitro scientific support for the use of the plant against skin infections in Mexican folk medicine.
Collapse
Affiliation(s)
- Araceli Pérez-Vásquez
- Departamento de Farmacia, Facultad de Química Instituto de Biología, Universidad Nacional Autónoma de México, México, México
| | | | | | | | | | | |
Collapse
|
13
|
Zubek S, Stojakowska A, Anielska T, Turnau K. Arbuscular mycorrhizal fungi alter thymol derivative contents of Inula ensifolia L. MYCORRHIZA 2010; 20:497-504. [PMID: 20177715 DOI: 10.1007/s00572-010-0306-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2009] [Accepted: 01/29/2010] [Indexed: 05/09/2023]
Abstract
Individuals of Inula ensifolia L. (Asteraceae), a valuable xerothermic plant species with potential therapeutic value, were inoculated under laboratory conditions with different strains of arbuscular mycorrhizal fungi (AMF): (1) Glomus intraradices UNIJAG PL-Bot, (2) G. intraradices UNIJAG PL-Kap, (3) Glomus clarum UNIJAG PL13-2, and (4) AMF crude inoculum from natural stands of I. ensifolia. We found AMF species specificity in the stimulation of thymol derivative production in the roots of I. ensifolia. There was an increase in thymol derivative contents in roots after G. clarum inoculation and at the same time the decreased production of these metabolites in the G. intraradices treatments. Moreover, no correlation between the extent of AMF colonization and the effects of the fungal symbionts on the plant was observed. A multilevel analysis of chlorophyll a fluorescence transients (JIP test) permitted an evaluation of plant vitality, expressed in photosynthetic performance index, influenced by the applied AMF strains, which was found to be in good agreement with the results concerning thymol derivative production. The mechanisms by which AMF trigger changes in phytochemical concentration in plant tissues and their consequences for practice are discussed.
Collapse
Affiliation(s)
- Szymon Zubek
- Mycology Unit, Institute of Botany, Jagiellonian University, Lubicz 46, 31-512 Kraków, Poland.
| | | | | | | |
Collapse
|
14
|
Zhao YM, Wang YJ, Dong M, Zhang ML, Huo CH, Gu YC, Shi QW. Two new eudesmanes from Inula helenium. Chem Nat Compd 2010. [DOI: 10.1007/s10600-010-9620-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
15
|
Zhao J, Li Y, Liu Q, Gao K. Antimicrobial activities of some thymol derivatives from the roots of Inula hupehensis. Food Chem 2010. [DOI: 10.1016/j.foodchem.2009.10.045] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
16
|
Stojakowska A, Michalska K, Malarz J. Simultaneous quantification of eudesmanolides and thymol derivatives from tissues of Inula helenium and I. royleana by reversed-phase high-performance liquid chromatography. PHYTOCHEMICAL ANALYSIS : PCA 2006; 17:157-61. [PMID: 16749422 DOI: 10.1002/pca.900] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
A simple and rapid isocratic reversed-phase high-performance liquid chromatographic method for the quantification of alantolactone/isoalantolactone and three thymol derivatives in roots and root cultures of Inula helenium and I. royleana has been developed. The method could be applied to screen raw materials in search for highly productive plants and in vitro cultures.
Collapse
Affiliation(s)
- Anna Stojakowska
- Department of Phytochemistry, Institute of Pharmacology, Polish Academy of Sciences, Kraków, Poland.
| | | | | |
Collapse
|