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Brah AS, Armah FA, Obuah C, Akwetey SA, Adokoh CK. Toxicity and therapeutic applications of citrus essential oils (CEOs): a review. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2023. [DOI: 10.1080/10942912.2022.2158864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Augustine S. Brah
- Department of Biomedical Sciences, School of Allied Health Sciences, University of Cape Coast, Cape Coast, Ghana
| | - Francis A. Armah
- Department of Biomedical Sciences, School of Allied Health Sciences, University of Cape Coast, Cape Coast, Ghana
| | - Collins Obuah
- Department of Chemistry, University of Ghana, Legon, Ghana
| | - Samuel A. Akwetey
- Department of Biomedical Sciences, School of Allied Health Sciences, University of Cape Coast, Cape Coast, Ghana
- Department of Clinical Microbiology, School of Medicine, University for Development Studies, Tamale
| | - Christian K. Adokoh
- Department of Forensic Sciences, School of Biological Sciences, University of Cape Coast, Cape Coast, Ghana
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The Use of D-Optimal Mixture Design in Optimizing Formulation of a Nutraceutical Hard Candy. INTERNATIONAL JOURNAL OF FOOD SCIENCE 2023; 2023:7510452. [PMID: 36968159 PMCID: PMC10033211 DOI: 10.1155/2023/7510452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 12/02/2022] [Accepted: 02/17/2023] [Indexed: 03/17/2023]
Abstract
The aim of this study was to optimize the formulation of hard candy with antiviral herbal extracts and flowered with Citrus limon peel essential oils. To substitute water fraction, the D-optimal mixture design was used. The optimized mixture fractions of the best hard candy formulation contain Curcuma longa extract (10%), Artemisia herba-alba Asso extract (3.33%), Glycyrrhiza glabra extract (1.66%), and Zingiber officinale extract (1.66%) and flowered by 20 μL/100 gram of Citrus limon essential oils. The effect of the addition had been investigated on the sensory, physicochemical, and phytochemical of the hard candy according to the optimal formulation. The main component of Citrus limon essential oil is limonene (52.47%), which has a pleasant lemon fragrance. The mixture of herbal extract added increased the total phenols, the flavonoid, and the ash content of the formulated hard candy (
mg GAE/g,
mg CE/g, and
, respectively). The measurement of the DPPH free radical activity reveals a good antioxidant activity (26.4%). Furthermore, the sensory analysis has shown a good appreciation. Thus, formulated hard candy is a sensorially and therapeutically interesting product.
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Yang J, Lee SY, Jang SK, Kim KJ, Park MJ. Inhibition of Melanogenesis by Essential Oils from the Citrus Cultivars Peels. Int J Mol Sci 2023; 24:ijms24044207. [PMID: 36835634 PMCID: PMC9962211 DOI: 10.3390/ijms24044207] [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: 01/15/2023] [Revised: 02/10/2023] [Accepted: 02/16/2023] [Indexed: 02/22/2023] Open
Abstract
Citrus is one of the most popular and widely grown fruit crops in the world. However, the bioactivity of only certain species of citrus cultivars is studied. In this study, the effects of essential oils from 21 citrus cultivars on melanogenesis were investigated in an effort to identify active anti-melanogenesis constituents. The essential oils from the peels of 21 citrus cultivars obtained by hydro-distillation were analyzed using gas chromatography-mass spectrometry. Mouse melanoma B16BL6 cells were used in all assays conducted in this study. The tyrosinase activity and melanin content were determined using the lysate of α-Melanocyte-stimulated B16BL6 cells. In addition, the melanogenic gene expression was determined by quantitative reverse transcription-polymerase chain reaction. Overall, the essential oils of (Citrus unshiu X Citrus sinensis) X Citrus reticulata, Citrus reticulata, and ((Citrus unshiu X Citrus sinensis) X Citrus reticulata) X Citrus reticulata provided the best bioactivity and comprised five distinct constituents compared to other essential oils such as limonene, farnesene, β-elemene, terpinen-4-ol, and sabinene. The anti-melanogenesis activities of the five individual compounds were evaluated. Among the five essential oils, β-elemene, farnesene, and limonene showed dominating properties. The experimental results indicated that (Citrus unshiu X Citrus sinensis) X Citrus reticulata, Citrus reticulata, and ((Citrus unshiu X Citrus sinensis) X Citrus reticulata) X Citrus reticulara are potential candidates with anti-melanogenesis activity for use as cosmetics and pharmaceutical agents against skin hyperpigmentation.
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Affiliation(s)
- Jiyoon Yang
- Forest Industrial Materials Division, Forest Products and Industry Department, National Institute of Forest Science, Seoul 02455, Republic of Korea
- Division of Life Sciences, Korea University, Seoul 02841, Republic of Korea
| | - Su-Yeon Lee
- Forest Industrial Materials Division, Forest Products and Industry Department, National Institute of Forest Science, Seoul 02455, Republic of Korea
| | - Soo-Kyeong Jang
- Forest Industrial Materials Division, Forest Products and Industry Department, National Institute of Forest Science, Seoul 02455, Republic of Korea
| | - Ki-Joong Kim
- Division of Life Sciences, Korea University, Seoul 02841, Republic of Korea
| | - Mi-Jin Park
- Forest Industrial Materials Division, Forest Products and Industry Department, National Institute of Forest Science, Seoul 02455, Republic of Korea
- Correspondence: ; Tel.: +82-2-961-2751; Fax: +82-2-961-2769
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Yazgan H. Antimicrobial activities of emulsion-based edible solutions incorporating lemon essential oil and sodium caseinate against some food-borne bacteria. JOURNAL OF FOOD SCIENCE AND TECHNOLOGY 2022; 59:4695-4705. [PMID: 36276524 PMCID: PMC9579266 DOI: 10.1007/s13197-022-05551-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 07/08/2022] [Accepted: 07/14/2022] [Indexed: 06/16/2023]
Abstract
The antimicrobial properties of two different emulsion formulations contained lemon essential oil (coarse emulsion; CE and nanoemulsion; NE) and emulsions based edible solutions incorporated with lemon essential oil and sodium caseinate (coarse emulsion based solution; CESC and nanoemulsion based solution; NESC) on food-related microorganisms (Photobacterium damselae, Pseudomonas luteola, Salmonella Paratyphi A NCTC13, and Listeria monocytogenes ATCC19112) were investigated. The chemical compositions of lemon essential oils were identified by GC-MS. Physical parameter of different formulations was also analyzed at different time intervals. The antimicrobial properties of solutions were determined by using well diffusion, minimum inhibitory concentration (MIC) and minimum bactericidal concentration, and time-kill assay. The major identified component in lemon essential oil was D limonene (38.38%). NE showed a stronger antimicrobial effect against S. Paratyphi A and L. monocytogenes with 36.50 and 38.75 mm diameter zone compared to all other formulations. Listeria monocytogenes had the highest sensitivity towards NE and NESC formulations with 3.12 mg/ml MIC values in comparison to other two formulations. The nanoemulsion and nanoemulsion based coating solution were more effective than other formulations in killing bacterial cell within a short period time.
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Affiliation(s)
- Hatice Yazgan
- Department of Food Hygiene and Technology, Faculty of Ceyhan Veterinary Medicine, University of Cukurova, 01330 Balcalı, Adana, Turkey
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Phytochemical Profiling, Antioxidant, Antimicrobial and Cholinesterase Inhibitory Effects of Essential Oils Isolated from the Leaves of Artemisia scoparia and Artemisia absinthium. Pharmaceuticals (Basel) 2022; 15:ph15101221. [PMID: 36297333 PMCID: PMC9607455 DOI: 10.3390/ph15101221] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 09/27/2022] [Accepted: 09/28/2022] [Indexed: 11/05/2022] Open
Abstract
The current studies were focused on the phytochemical profiling of two local wild Artemisia species, Artemisia scoparia and Artemisia absinthium leaves’ essential oils, extracted via the hydro distillation method along with evaluation of their antioxidant as well as antimicrobial effects. The constituents of EOs were identified using a combined gas chromatography-mass spectrometric (GC-MS) technique. A total of 25 compounds in A. scoparia essential oil (EOAS) were identified, and 14 compounds with percentage abundance of >1% were tabulated, the major being tocopherol derivatives (47.55%). A total of nine compounds in Artemisia absinthium essential oil (EOAA) were enlisted (% age > 1%), the majority being oleic acid derivatives (41.45%). Strong antioxidant effects were pronounced by the EOAS in DPPH (IC50 = 285 ± 0.82 µg/mL) and in ABTS (IC50 = 295 ± 0.32 µg/mL) free radical scavenging assays. Both the EOs remained potent in inhibiting the growth of bacterial species; Escherichia coli (55−70%) and Shigella flexneri (60−75%) however remained moderately effective against Bacillus subtilis as well as Staphylococcus aureus. Both EOAS and EOAA strongly inhibited the growth of the tested fungal species, especially Aspergillus species (up to 70%). The oils showed anti-cholinesterase potential by inhibiting both Acetylcholinesterase (AChE; IC50 = 30 ± 0.04 µg/mL (EOAS), 32 ± 0.05 µg/mL (EOAA) and Butyrylcholinesterase (BChE; IC50 = 34 ± 0.07 µg/mL (EOAS), 36 ± 0.03 µg/mL (EOAA). In conclusion, the essential oils of A. scoparia and A. absinthium are promising antioxidant, antimicrobial and anticholinergic agents with a different phytochemical composition herein reported for the first time.
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Fadilah NQ, Jittmittraphap A, Leaungwutiwong P, Pripdeevech P, Dhanushka D, Mahidol C, Ruchirawat S, Kittakoop P. Virucidal Activity of Essential Oils From Citrus x aurantium L. Against Influenza A Virus H1N1:Limonene as a Potential Household Disinfectant Against Virus. Nat Prod Commun 2022. [DOI: 10.1177/1934578x211072713] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
This work explored the compositions of a crude extract of peels of Citrus x aurantium using a gas chromatography-mass spectrometry (GC-MS) technique. The crude extract of peels of C. × aurantium was analyzed by GC-MS revealing the presence of limonene as the major compound, accounting for 93.7% of the total. Virucidal activity of the oil of C. x aurantium peels against influenza A virus H1N1 was evaluated by the ASTM E1053-20 method. Moreover, the virucidal activity was also investigated of D-limonene, the major terpene in essential oils of C. x aurantium, and its enantiomer L-limonene. The essential oil of the C. x aurantium peels produced a log reduction of 1.9 to 2.0, accounting for 99% reduction of the virus, while D- and L-limonene exhibited virucidal activity with a log reduction of 3.70 to 4.32 at concentrations of 125 and 250.0 µg/mL, thus reducing the virus by 99.99%. Previous work found that D-limonene exhibited antiviral activity against herpes simplex virus, but L-limonene, an enantiomer of D-limonene, has never been reported for antiviral activity. This work demonstrates the antiviral activity of L-limonene for the first time. Moreover, this work suggests that concentrations of 0.0125% to 0.025% of either D- or L-limonene can possibly be used as a disinfectant against viruses, probably in the form of essential oil sprays, which may be useful disinfectants against the airborne transmission of viruses, such as influenza and COVID-19.
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Affiliation(s)
- Nurul Q. Fadilah
- Chulabhorn Graduate Institute, Program in Chemical Sciences, Chulabhorn Royal Academy, Bangkok, Thailand
| | | | | | | | - Darshana Dhanushka
- Chulabhorn Graduate Institute, Program in Chemical Sciences, Chulabhorn Royal Academy, Bangkok, Thailand
| | - Chulabhorn Mahidol
- Chulabhorn Graduate Institute, Program in Chemical Sciences, Chulabhorn Royal Academy, Bangkok, Thailand
- Chulabhorn Research Institute, Bangkok, Thailand
| | - Somsak Ruchirawat
- Chulabhorn Graduate Institute, Program in Chemical Sciences, Chulabhorn Royal Academy, Bangkok, Thailand
- Chulabhorn Research Institute, Bangkok, Thailand
- CHE, Ministry of Education, Bangkok, Thailand
| | - Prasat Kittakoop
- Chulabhorn Graduate Institute, Program in Chemical Sciences, Chulabhorn Royal Academy, Bangkok, Thailand
- Chulabhorn Research Institute, Bangkok, Thailand
- CHE, Ministry of Education, Bangkok, Thailand
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Salvino RA, Aroulanda C, De Filpo G, Celebre G, De Luca G. Metabolic composition and authenticity evaluation of bergamot essential oil assessed by nuclear magnetic resonance spectroscopy. Anal Bioanal Chem 2022; 414:2297-2313. [PMID: 35048138 DOI: 10.1007/s00216-021-03869-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 12/21/2021] [Accepted: 12/23/2021] [Indexed: 11/30/2022]
Abstract
In this work, a sample of pure and certified bergamot essential oil (BEO) was extensively studied for the first time directly by NMR spectroscopy with the aim of investigating its metabolic composition, quantifying the main components of this complex natural matrix and simultaneously assessing whether the NMR technique is able to highlight possible frauds to which this high-cost product may be subjected. Eleven low molecular weight compounds have been identified by using 1D 1H and 13C-{1H} NMR experiments, 2D homo- and heteronuclear correlation NMR spectra, and 2D 1H DOSY experiments; the most abundant of them, i.e., about 90% of the sample analyzed, has been quantified by employing benzoic acid as an internal standard by 1H NMR spectrum. Moreover, since the commercial fraud of this precious oil is often due to the addition of less expensive oils, we have simulated a possible adulteration through the preparation of BEO samples to which different percentages of orange essential oil (OEO) were added. The results, obtained by combining the 1H NMR spectra collected on the adulterated samples and on pure BEO, with chemometric analysis, principal component analysis (PCA), indicate that it is possible to distinguish the sample of pure BEO from the adulterated ones and also, among them, to differentiate between the degrees of adulteration.
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Affiliation(s)
- Rosachiara A Salvino
- Department of Chemistry & Chemical Technologies, University of Calabria, via P. Bucci, 87036, Rende, CS, Italy.,Université Paris-Saclay, ICMMO, UMR CNRS 8182, RMN en Milieu Orienté, 91405, Orsay cedex, France
| | - Christie Aroulanda
- Université Paris-Saclay, ICMMO, UMR CNRS 8182, RMN en Milieu Orienté, 91405, Orsay cedex, France
| | - Giovanni De Filpo
- Department of Chemistry & Chemical Technologies, University of Calabria, via P. Bucci, 87036, Rende, CS, Italy
| | - Giorgio Celebre
- Department of Chemistry & Chemical Technologies, University of Calabria, via P. Bucci, 87036, Rende, CS, Italy
| | - Giuseppina De Luca
- Department of Chemistry & Chemical Technologies, University of Calabria, via P. Bucci, 87036, Rende, CS, Italy.
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Lu X, Zhao C, Shi H, Liao Y, Xu F, Du H, Xiao H, Zheng J. Nutrients and bioactives in citrus fruits: Different citrus varieties, fruit parts, and growth stages. Crit Rev Food Sci Nutr 2021; 63:2018-2041. [PMID: 34609268 DOI: 10.1080/10408398.2021.1969891] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Citrus fruits are consumed in large quantities worldwide due to their attractive aromas and taste, as well as their high nutritional values and various health-promoting effects, which are due to their abundance of nutrients and bioactives. In addition to water, carbohydrates, vitamins, minerals, and dietary fibers are important nutrients in citrus, providing them with high nutritional values. Citrus fruits are also rich in various bioactives such as flavonoids, essential oils, carotenoids, limonoids, and synephrines, which protect from various ailments, including cancer and inflammatory, digestive, and cardiovascular diseases. The composition and content of nutrients and bioactives differ significantly among citrus varieties, fruit parts, and growth stages. To better understand the nutrient and bioactive profiles of citrus fruits and provide guidance for the utilization of high-value citrus resources, this review systematically summarizes the nutrients and bioactives in citrus fruit, including their contents, structural characteristics, and potential health benefits. We also explore the composition variation in different citrus varieties, fruits parts, and growth stages, as well as their health-promoting effects and applications.
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Affiliation(s)
- Xingmiao Lu
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Chengying Zhao
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Huan Shi
- Department of science and technology catalyze, Nestlé R&D (China) Ltd, Beijing, China
| | - Yongcheng Liao
- Department of science and technology catalyze, Nestlé R&D (China) Ltd, Beijing, China
| | - Fei Xu
- Department of science and technology catalyze, Nestlé R&D (China) Ltd, Beijing, China
| | - Hengjun Du
- Department of Food Science, University of Massachusetts, Amherst, Massachusetts, USA
| | - Hang Xiao
- Department of Food Science, University of Massachusetts, Amherst, Massachusetts, USA
| | - Jinkai Zheng
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Beijing, China
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Bava R, Castagna F, Piras C, Palma E, Cringoli G, Musolino V, Lupia C, Perri MR, Statti G, Britti D, Musella V. In Vitro Evaluation of Acute Toxicity of Five Citrus spp. Essential Oils towards the Parasitic Mite Varroa destructor. Pathogens 2021; 10:pathogens10091182. [PMID: 34578214 PMCID: PMC8466118 DOI: 10.3390/pathogens10091182] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 09/08/2021] [Accepted: 09/09/2021] [Indexed: 12/24/2022] Open
Abstract
Varroa destructor is the most important ectoparasitic mite of honey bees that has a negative impact on bee health and honey production. The control programs are mainly based on the use of synthetic acaricides that are often administered indiscriminately. All this has led to drug resistance that now represent a great concern for honey bee farming. The research for alternative products/methods for mites’ control is now mandatory. The aim of this study was to test whether Citrus spp. essential oils could diminish the growth of the V. destructor mite. In Calabria (southern Italy), plants of the Citrus genus are very common and grow both spontaneously and cultured. The essential oils used in this study were extracted from bergamot (Citrus bergamia), grapefruit (Citrus paradisi), lemon (Citrus limon), orange (Citrus sinensis), and mandarin (Citrus reticulata) by hydrodistillation. Every EO was in vitro tested against V. destructor. Each experimental replicate was performed using 35 viable adult female mites (5 for each EO) collected the same day from the same apiary and included negative controls (5 individuals exposed to acetone only) and positive controls (5 individuals exposed to Amitraz diluted in acetone). The essential oils (Eos) were diluted (0.5 mg/mL, 1 mg/mL, and 2 mg/mL) in HPLC grade acetone to obtain the working solution to be tested (50 µL/tube). Mite mortality was manually assessed after 1 h exposure under controlled conditions. The essential oils that showed the best effectiveness at 0.5 mg/mL were bergamot, which neutralized (dead + inactivated) 80% (p ≤ 0.001) of the parasites; grapefruit, which neutralized 70% (p ≤ 0.001); and lemon, which neutralized 69% of them. Interestingly, the positive control (Amitraz) at the same concentration neutralized 60% of the parasites. These results demonstrate that Calabrian bergamot, grapefruit, and lemon Eos consistently reduced V. destructor viability and open the possibility for their utilization to control this parasite in honey bee farming.
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Affiliation(s)
- Roberto Bava
- Department of Health Sciences, University of Catanzaro Magna Græcia, CIS VetSUA, Viale Europa, 88100 Catanzaro, Italy; (R.B.); (F.C.); (E.P.); (D.B.); (V.M.)
| | - Fabio Castagna
- Department of Health Sciences, University of Catanzaro Magna Græcia, CIS VetSUA, Viale Europa, 88100 Catanzaro, Italy; (R.B.); (F.C.); (E.P.); (D.B.); (V.M.)
| | - Cristian Piras
- Department of Health Sciences, University of Catanzaro Magna Græcia, CIS VetSUA, Viale Europa, 88100 Catanzaro, Italy; (R.B.); (F.C.); (E.P.); (D.B.); (V.M.)
- Correspondence: (C.P.); (V.M.)
| | - Ernesto Palma
- Department of Health Sciences, University of Catanzaro Magna Græcia, CIS VetSUA, Viale Europa, 88100 Catanzaro, Italy; (R.B.); (F.C.); (E.P.); (D.B.); (V.M.)
- Nutramed S.c.a.r.l. Complesso Ninì Barbieri, Roccelletta di Borgia, 88021 Catanzaro, Italy
- Institute of Research for Food Safety & Health (IRC-FISH), Department of Health Sciences, University of Catanzaro Magna Græcia University, 88100 Catanzaro, Italy
| | - Giuseppe Cringoli
- Department of Veterinary Medicine and Animal Production, University of Naples Federico II, CREMOPAR Campania Region, 80137 Naples, Italy;
| | - Vincenzo Musolino
- Department of Health Sciences, University of Catanzaro Magna Græcia, CIS VetSUA, Viale Europa, 88100 Catanzaro, Italy; (R.B.); (F.C.); (E.P.); (D.B.); (V.M.)
- Institute of Research for Food Safety & Health (IRC-FISH), Department of Health Sciences, University of Catanzaro Magna Græcia University, 88100 Catanzaro, Italy
- Correspondence: (C.P.); (V.M.)
| | - Carmine Lupia
- Mediterranean Etnobotanical Conservatory, Sersale, 88054 Catanzaro, Italy;
| | - Maria Rosaria Perri
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, 87100 Cosenza, Italy; (M.R.P.); (G.S.)
| | - Giancarlo Statti
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, 87100 Cosenza, Italy; (M.R.P.); (G.S.)
| | - Domenico Britti
- Department of Health Sciences, University of Catanzaro Magna Græcia, CIS VetSUA, Viale Europa, 88100 Catanzaro, Italy; (R.B.); (F.C.); (E.P.); (D.B.); (V.M.)
| | - Vincenzo Musella
- Department of Health Sciences, University of Catanzaro Magna Græcia, CIS VetSUA, Viale Europa, 88100 Catanzaro, Italy; (R.B.); (F.C.); (E.P.); (D.B.); (V.M.)
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Lemon Oils Attenuate the Pathogenicity of Pseudomonas aeruginosa by Quorum Sensing Inhibition. Molecules 2021; 26:molecules26102863. [PMID: 34066034 PMCID: PMC8151035 DOI: 10.3390/molecules26102863] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 04/26/2021] [Accepted: 05/07/2021] [Indexed: 11/17/2022] Open
Abstract
The chemical composition of three Citrus limon oils: lemon essential oil (LEO), lemon terpenes (LT) and lemon essence (LE), and their influence in the virulence factors production and motility (swarming and swimming) of two Pseudomonas aeruginosa strains (ATCC 27853 and a multidrug-resistant HT5) were investigated. The main compound, limonene, was also tested in biological assays. Eighty-four compounds, accounting for a relative peak area of 99.23%, 98.58% and 99.64%, were identified by GC/MS. Limonene (59-60%), γ-terpinene (10-11%) and β-pinene (7-15%) were the main compounds. All lemon oils inhibited specific biofilm production and bacterial metabolic activities into biofilm in a dose-dependent manner (20-65%, in the range of 0.1-4 mg mL-1) of both strains. Besides, all samples inhibited about 50% of the elastase activity at 0.1 mg mL-1. Pyocyanin biosynthesis decreases until 64% (0.1-4 mg mL-1) for both strains. Swarming motility of P. aeruginosa ATCC 27853 was completely inhibited by 2 mg mL-1 of lemon oils. Furthermore, a decrease (29-55%, 0.1-4 mg mL-1) in the synthesis of Quorum sensing (QS) signals was observed. The oils showed higher biological activities than limonene. Hence, their ability to control the biofilm of P. aeruginosa and reduce the production of virulence factors regulated by QS makes lemon oils good candidates to be applied as preservatives in the food processing industry.
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