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Anderson RC, Levent G, Petrujkić BT, Harvey RB, Hume ME, He H, Genovese KJ, Beier RC, Poole TL, Crippen TL, Nisbet DJ. Antagonistic Effects of Lipids Against the Anti- Escherichia coli and Anti- Salmonella Activity of Thymol and Thymol-β-d-Glucopyranoside in Porcine Gut and Fecal Cultures In Vitro. Front Vet Sci 2021; 8:751266. [PMID: 34631867 PMCID: PMC8497039 DOI: 10.3389/fvets.2021.751266] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Accepted: 08/20/2021] [Indexed: 11/13/2022] Open
Abstract
Strategies are sought to reduce the carriage and dissemination of zoonotic pathogens and antimicrobial-resistant microbes within food-producing animals and their production environment. Thymol (an essential oil) is a potent bactericide in vitro but in vivo efficacy has been inconsistent, largely due to its lipophilicity and absorption, which limits its passage and subsequent availability in the distal gastrointestinal tract. Conjugation of thymol to glucose to form thymol-β-d-glucopyranoside can decrease its absorption, but in vivo passage of effective concentrations to the lower gut remains suboptimal. Considering that contemporary swine diets often contain 5% or more added fat (to increase caloric density and reduce dustiness), we hypothesized that there may be sufficient residual fat in the distal intestinal tract to sequester free or conjugated thymol, thereby limiting the availability and subsequent effectiveness of this biocide. In support of this hypothesis, the anti-Salmonella Typhimurium effects of 6 mM free or conjugated thymol, expressed as log10-fold reductions of colony-forming units (CFU) ml-1, were diminished 90 and 58%, respectively, following 24-h in vitro anaerobic fecal incubation (at 39°C) with 3% added vegetable oil compared to reductions achieved during culture without added oil (6.1 log10 CFU ml-1). The antagonistic effect of vegetable oil and the bactericidal effect of free and conjugated thymol against Escherichia coli K88 tested similarly were diminished 86 and 84%, respectively, compared to reductions achieved in cultures incubated without added vegetable oil (5.7 log10 CFU ml-1). Inclusion of taurine (8 mg/ml), bile acids (0.6 mg/ml), or emulsifiers such as polyoxyethylene-40 stearate (0.2%), Tween 20, or Tween 80 (each at 1%) in the in vitro incubations had little effect on vegetable oil-caused inhibition of free or conjugated thymol. Based on these results, it seems reasonable to suspect that undigested lipid in the distal gut may limit the effectiveness of free or conjugated thymol. Accordingly, additional research is warranted to learn how to overcome obstacles diminishing bactericidal activity of free and conjugated thymol in the lower gastrointestinal tract of food-producing animals.
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Affiliation(s)
- Robin C Anderson
- United States Department of Agriculture, Agricultural Research Service, Southern Plains Agricultural Research Center, College Station, TX, United States
| | - Gizem Levent
- United States Department of Agriculture, Agricultural Research Service, Southern Plains Agricultural Research Center, College Station, TX, United States.,Department of Veterinary Pathobiology, Texas A&M University, College Station, TX, United States
| | - Branko T Petrujkić
- United States Department of Agriculture, Agricultural Research Service, Southern Plains Agricultural Research Center, College Station, TX, United States.,Department of Nutrition and Botany, Faculty of Veterinary Medicine, University of Belgrade, Belgrade, Serbia
| | - Roger B Harvey
- United States Department of Agriculture, Agricultural Research Service, Southern Plains Agricultural Research Center, College Station, TX, United States
| | - Michael E Hume
- United States Department of Agriculture, Agricultural Research Service, Southern Plains Agricultural Research Center, College Station, TX, United States
| | - Haiqi He
- United States Department of Agriculture, Agricultural Research Service, Southern Plains Agricultural Research Center, College Station, TX, United States
| | - Kenneth J Genovese
- United States Department of Agriculture, Agricultural Research Service, Southern Plains Agricultural Research Center, College Station, TX, United States
| | - Ross C Beier
- United States Department of Agriculture, Agricultural Research Service, Southern Plains Agricultural Research Center, College Station, TX, United States
| | - Toni L Poole
- United States Department of Agriculture, Agricultural Research Service, Southern Plains Agricultural Research Center, College Station, TX, United States
| | - Tawni L Crippen
- United States Department of Agriculture, Agricultural Research Service, Southern Plains Agricultural Research Center, College Station, TX, United States
| | - David J Nisbet
- United States Department of Agriculture, Agricultural Research Service, Southern Plains Agricultural Research Center, College Station, TX, United States
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2
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Levent G, Anderson RC, Petrujkić B, Poole TL, He H, Genovese KJ, Hume ME, Beier RC, Harvey RB, Nisbet DJ. Evaluation of Thymol-β-d-Glucopyranoside as a Potential Prebiotic Intervention to Reduce Carriage of Zoonotic Pathogens in Weaned and Feeder Pigs. Microorganisms 2021; 9:microorganisms9040860. [PMID: 33923741 PMCID: PMC8073024 DOI: 10.3390/microorganisms9040860] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 04/10/2021] [Accepted: 04/13/2021] [Indexed: 02/07/2023] Open
Abstract
The gut of food-producing animals is a reservoir for foodborne pathogens. Thymol is bactericidal against foodborne pathogens but rapid absorption of thymol from the proximal gut precludes the delivery of effective concentrations to the lower gut where pathogens mainly colonize. Thymol-β-d-glucopyranoside is reported to be more resistant to absorption than thymol in everted jejunal segments and could potentially function as a prebiotic by resisting degradation and absorption in the proximal gut but being hydrolysable by microbial β-glycosidase in the distal gut. Previous in vitro studies showed bactericidal effects of thymol-β-d-glucopyranoside against Campylobacter, Escherichia coli, and Salmonella enterica serovar Typhimurium in the presence but not absence of intestinal microbes expressing β-glycosidase activity, indicating that hydrolysis was required to obtain antimicrobial activity. Presently, the oral administration of thymol-β-d-glucopyranoside was studied to examine the effects on intestinal carriage of Campylobacter, E. coli, and S. Typhimurium in swine. The effects of thymol-β-d-glucopyranoside or thymol on antimicrobial sensitivity of representative E. coli isolates and characterized Salmonella strains were also explored. Results from two in vivo studies revealed little antimicrobial effects of thymol-β-d-glucopyranoside on Campylobacter, E. coli, or S. Typhimurium in swine gut. These findings add credence to current thinking that hydrolysis and absorption of thymol-β-d-glucopyranoside and thymol may be sufficiently rapid within the proximal gut to preclude delivery to the distal gut. Antibiotic susceptibilities of selected bacterial isolates and strains were mainly unaffected by thymol. Further research is warranted to overcome obstacles, preventing the delivery of efficacious amounts of thymol-β-d-glucopyranoside to the lower gut.
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Affiliation(s)
- Gizem Levent
- United States Department of Agriculture, Agricultural Research Service, Food and Feed Safety Research Unit, College Station, TX 77845, USA; (G.L.); (B.P.); (T.L.P.); (H.H.); (K.J.G.); (M.E.H.); (R.C.B.); (R.B.H.); (D.J.N.)
- Department of Veterinary Pathobiology, Texas A&M University, College Station, TX 77840, USA
| | - Robin C. Anderson
- United States Department of Agriculture, Agricultural Research Service, Food and Feed Safety Research Unit, College Station, TX 77845, USA; (G.L.); (B.P.); (T.L.P.); (H.H.); (K.J.G.); (M.E.H.); (R.C.B.); (R.B.H.); (D.J.N.)
- Correspondence: ; Tel.: +1-979-260-9317
| | - Branko Petrujkić
- United States Department of Agriculture, Agricultural Research Service, Food and Feed Safety Research Unit, College Station, TX 77845, USA; (G.L.); (B.P.); (T.L.P.); (H.H.); (K.J.G.); (M.E.H.); (R.C.B.); (R.B.H.); (D.J.N.)
- Faculty of Veterinary Medicine, University of Belgrade, 11000 Belgrade, Serbia
| | - Toni L. Poole
- United States Department of Agriculture, Agricultural Research Service, Food and Feed Safety Research Unit, College Station, TX 77845, USA; (G.L.); (B.P.); (T.L.P.); (H.H.); (K.J.G.); (M.E.H.); (R.C.B.); (R.B.H.); (D.J.N.)
| | - Haiqi He
- United States Department of Agriculture, Agricultural Research Service, Food and Feed Safety Research Unit, College Station, TX 77845, USA; (G.L.); (B.P.); (T.L.P.); (H.H.); (K.J.G.); (M.E.H.); (R.C.B.); (R.B.H.); (D.J.N.)
| | - Kenneth J. Genovese
- United States Department of Agriculture, Agricultural Research Service, Food and Feed Safety Research Unit, College Station, TX 77845, USA; (G.L.); (B.P.); (T.L.P.); (H.H.); (K.J.G.); (M.E.H.); (R.C.B.); (R.B.H.); (D.J.N.)
| | - Michael E. Hume
- United States Department of Agriculture, Agricultural Research Service, Food and Feed Safety Research Unit, College Station, TX 77845, USA; (G.L.); (B.P.); (T.L.P.); (H.H.); (K.J.G.); (M.E.H.); (R.C.B.); (R.B.H.); (D.J.N.)
| | - Ross C. Beier
- United States Department of Agriculture, Agricultural Research Service, Food and Feed Safety Research Unit, College Station, TX 77845, USA; (G.L.); (B.P.); (T.L.P.); (H.H.); (K.J.G.); (M.E.H.); (R.C.B.); (R.B.H.); (D.J.N.)
| | - Roger B. Harvey
- United States Department of Agriculture, Agricultural Research Service, Food and Feed Safety Research Unit, College Station, TX 77845, USA; (G.L.); (B.P.); (T.L.P.); (H.H.); (K.J.G.); (M.E.H.); (R.C.B.); (R.B.H.); (D.J.N.)
| | - David J. Nisbet
- United States Department of Agriculture, Agricultural Research Service, Food and Feed Safety Research Unit, College Station, TX 77845, USA; (G.L.); (B.P.); (T.L.P.); (H.H.); (K.J.G.); (M.E.H.); (R.C.B.); (R.B.H.); (D.J.N.)
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3
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A mini-review of Thymol incorporated materials: Applications in antibacterial wound dressing. J Drug Deliv Sci Technol 2020. [DOI: 10.1016/j.jddst.2020.101904] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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4
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Lu T, Marmion M, Ferone M, Wall P, Scannell AGM. On farm interventions to minimise Campylobacter spp. contamination in chicken. Br Poult Sci 2020; 62:53-67. [PMID: 32835499 DOI: 10.1080/00071668.2020.1813253] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
1. This review explores current and proposed on-farm interventions and assess the potential of these interventions against Campylobacter spp. 2. Interventions such as vaccination, feed/water-additives and, most importantly, consistent biosecurity, exhibit potential for the effective control of this pathogen and its dissemination within the food chain. 3. Due to the extensive diversity in the Campylobacter spp. genome and surface-expressed proteins, vaccination of poultry is not yet regarded as a completely effective strategy. 4. The acidification of drinking water through the addition of organic acids has been reported to decrease the risk of Campylobacter spp. colonisation in broiler flocks. Whilst this treatment alone will not completely protect birds, use of water acidification in combination with in-feed measures to further reduce the level of Campylobacter spp. colonisation in poultry may be an option meriting further exploration. 5. The use of varied types of feed supplements to reduce the intestinal population and shedding rate of Campylobacter spp. in poultry is an area of growing interest in the poultry industry. Such supplements include pro - and pre-biotics, organic acids, bacteriocins and bacteriophage, which may be added to feed and water. 6. From the literature, it is clear that a distinct, albeit not unexpected, difference between the performance of in-feed interventions exists when examined in vitro compared to those determined in in vivo studies. It is much more likely that pooling some of the discussed approaches in the in-feed tool kit will provide an answer. 7. Whilst on-farm biosecurity is essential to maintain a healthy flock and reduce disease transmission, even the most stringent biosecurity measures may not have sufficient, consistent and predictable effects in controlling Campylobacter spp. Furthermore, the combination of varied dietary approaches and improved biosecurity measures may synergistically improve control.
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Affiliation(s)
- T Lu
- UCD School of Public Health, Physiotherapy and Sports Science, University College Dublin, National University of Ireland , Dublin, Ireland.,UCD Centre for Food Safety, University College Dublin, National University of Ireland , Dublin, Ireland
| | - M Marmion
- UCD School of Agriculture and Food Science, Agricultural & Food Science Centre, University College Dublin, National University of Ireland , Dublin, Ireland
| | - M Ferone
- UCD School of Agriculture and Food Science, Agricultural & Food Science Centre, University College Dublin, National University of Ireland , Dublin, Ireland
| | - P Wall
- UCD School of Public Health, Physiotherapy and Sports Science, University College Dublin, National University of Ireland , Dublin, Ireland.,UCD Centre for Food Safety, University College Dublin, National University of Ireland , Dublin, Ireland.,UCD Institute of Food and Health O'Brien Science Centre South, University College Dublin, National University of Ireland , Dublin, Ireland
| | - A G M Scannell
- UCD Centre for Food Safety, University College Dublin, National University of Ireland , Dublin, Ireland.,UCD School of Agriculture and Food Science, Agricultural & Food Science Centre, University College Dublin, National University of Ireland , Dublin, Ireland.,UCD Institute of Food and Health O'Brien Science Centre South, University College Dublin, National University of Ireland , Dublin, Ireland
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5
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Van Noten N, Van Liefferinge E, Degroote J, De Smet S, Desmet T, Michiels J. Fate of Thymol and Its Monoglucosides in the Gastrointestinal Tract of Piglets. ACS OMEGA 2020; 5:5241-5248. [PMID: 32201813 PMCID: PMC7081444 DOI: 10.1021/acsomega.9b04309] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 02/25/2020] [Indexed: 05/04/2023]
Abstract
The monoterpene thymol has been proposed as a valuable alternative to in-feed antibiotics in animal production. However, the effectiveness of the antimicrobial is comprised by its fast absorption in the upper gastrointestinal tract. In this work, two glucoconjugates, thymol α-d-glucopyranoside (TαG) and thymol β-d-glucopyranoside (TβG), were compared with free thymol for their potential to deliver higher concentrations of the active compound to the distal small intestine of supplemented piglets. Additionally, an analytical method was developed and validated for the simultaneous quantification of thymol and its glucoconjugates in different matrices. In stomach contents of pigs fed with 3333 μmol kg-1 thymol, TαG, or TβG, total thymol concentrations amounted to 3048, 2357, and 1820 μmol kg-1 dry matter, respectively. In glucoconjugate-fed pigs, over 30% of this concentration was present in the unconjugated form, suggesting partial hydrolysis in the stomach. No quantifiable levels of thymol or glucoconjugates were detected in the small intestine or cecum for any treatment, indicating that conjugation with one glucose unit did not sufficiently protect thymol from early absorption.
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Affiliation(s)
- Noémie Van Noten
- Department
of Animal Sciences and Aquatic Ecology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
| | - Elout Van Liefferinge
- Department
of Animal Sciences and Aquatic Ecology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
| | - Jeroen Degroote
- Department
of Animal Sciences and Aquatic Ecology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
| | - Stefaan De Smet
- Department
of Animal Sciences and Aquatic Ecology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
| | - Tom Desmet
- Department
of Biotechnology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
| | - Joris Michiels
- Department
of Animal Sciences and Aquatic Ecology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
- . Phone: +32 9/264.90.00
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6
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Van Noten N, Degroote J, Van Liefferinge E, Taminiau B, De Smet S, Desmet T, Michiels J. Effects of Thymol and Thymol α-D-Glucopyranoside on Intestinal Function and Microbiota of Weaned Pigs. Animals (Basel) 2020; 10:E329. [PMID: 32092931 PMCID: PMC7070699 DOI: 10.3390/ani10020329] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 02/16/2020] [Accepted: 02/17/2020] [Indexed: 12/29/2022] Open
Abstract
The present study evaluated gluco-conjugation as a measure to delay thymol absorption and enhance its antimicrobial activity in the gut of weaned piglets. The three dietary treatments consisted of a basal diet without additives (TCON), supplemented with thymol at 3.7 mmol/kg dry matter (TTHY), or with an equimolar amount of thymol α-D-glucopyranoside (TTαG). Each dietary treatment was replicated in 6 pens with 2 piglets per pen (n = 12 for analytical parameters) and was supplemented for 14 days. The total (free plus gluco-conjugated) thymol concentrations in the stomach contents were 14% lower in TTαG as compared to TTHY piglets. Neither of the additives could be detected further down the gut. E.coli counts in the proximal small intestine were significantly lower in TTHY than in TTαG pigs (3.35 vs. 4.29 log10 CFU/g); however, other bacterial counts and their metabolites were unaffected by treatment. A metagenomic bacterial analysis revealed a great relative abundance of Lactobacillus spp. in the distal small intestine (range 88.4%-99.9%), irrespective of treatment. The intestinal barrier function was improved by TTHY, but not TTαG, compared to TCON. In conclusion, gluco-conjugation did not result in higher thymol concentrations in the gut, but conversely, it seemed to diminish the biological effects of thymol in vivo.
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Affiliation(s)
- Noémie Van Noten
- Department of Animal Sciences and Aquatic Ecology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium; (N.V.N.); (J.D.); (E.V.L.); (S.D.S.)
| | - Jeroen Degroote
- Department of Animal Sciences and Aquatic Ecology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium; (N.V.N.); (J.D.); (E.V.L.); (S.D.S.)
| | - Elout Van Liefferinge
- Department of Animal Sciences and Aquatic Ecology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium; (N.V.N.); (J.D.); (E.V.L.); (S.D.S.)
| | - Bernard Taminiau
- Department of Food Sciences, University of Liège, Quartier Vallée 2, Avenue de Cureghem 7A-7D, 4000 Liège, Belgium;
| | - Stefaan De Smet
- Department of Animal Sciences and Aquatic Ecology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium; (N.V.N.); (J.D.); (E.V.L.); (S.D.S.)
| | - Tom Desmet
- Department of Biotechnology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium;
| | - Joris Michiels
- Department of Animal Sciences and Aquatic Ecology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium; (N.V.N.); (J.D.); (E.V.L.); (S.D.S.)
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7
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Angelica Stem: A Potential Low-Cost Source of Bioactive Phthalides and Phytosterols. Molecules 2018; 23:molecules23123065. [PMID: 30477097 PMCID: PMC6321507 DOI: 10.3390/molecules23123065] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Revised: 11/19/2018] [Accepted: 11/20/2018] [Indexed: 12/31/2022] Open
Abstract
Chinese Angelica is a significant medical plant due to the various therapeutic constituents in its root; whereas the aerial part is considered worthless and often discarded as agricultural waste. In this work, phytochemicals from the stem were first systematically analyzed by means of GC–MS after derivatization and HPLC–MS/MS in multiple reaction monitoring (MRM) mode. Phthalides, ferulic acid, and coniferyl ferulate were detected in the stem; although their content is relatively low in comparison with the root. Some specific compounds, such as p-hydroxybenzoic acid, vanillic acid, protocatechuic acid, caffeic acid, 4-hydroxyphenyl-1, 2-ethanediol, thymol-β-d-glucopyranoside, etc. and a significant amount of phytosterols (1.36 mg/g stem, mainly β-sitosterol) were detected in the stem. The extracted oil from the stem contained a considerable amount of phthalides (48.5 mg/g), β-sitosterol (56.21 mg/g), and stigmasterol (14.03 mg/g); no other bioactive compounds were found that could be potentially used as pharmaceuticals or additives to healthcare food.
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8
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Xu J, Chen HB, Li SL. Understanding the Molecular Mechanisms of the Interplay Between Herbal Medicines and Gut Microbiota. Med Res Rev 2017; 37:1140-1185. [PMID: 28052344 DOI: 10.1002/med.21431] [Citation(s) in RCA: 209] [Impact Index Per Article: 29.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2016] [Revised: 10/21/2016] [Accepted: 11/16/2016] [Indexed: 02/06/2023]
Abstract
Herbal medicines (HMs) are much appreciated for their significant contribution to human survival and reproduction by remedial and prophylactic management of diseases. Defining the scientific basis of HMs will substantiate their value and promote their modernization. Ever-increasing evidence suggests that gut microbiota plays a crucial role in HM therapy by complicated interplay with HM components. This interplay includes such activities as: gut microbiota biotransforming HM chemicals into metabolites that harbor different bioavailability and bioactivity/toxicity from their precursors; HM chemicals improving the composition of gut microbiota, consequently ameliorating its dysfunction as well as associated pathological conditions; and gut microbiota mediating the interactions (synergistic and antagonistic) between the multiple chemicals in HMs. More advanced experimental designs are recommended for future study, such as overall chemical characterization of gut microbiota-metabolized HMs, direct microbial analysis of HM-targeted gut microbiota, and precise gut microbiota research model development. The outcomes of such research can further elucidate the interactions between HMs and gut microbiota, thereby opening a new window for defining the scientific basis of HMs and for guiding HM-based drug discovery.
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Affiliation(s)
- Jun Xu
- School of Chinese Medicine, Hong Kong Baptist University, Kowloon Tong, Hong Kong
| | - Hu-Biao Chen
- School of Chinese Medicine, Hong Kong Baptist University, Kowloon Tong, Hong Kong
| | - Song-Lin Li
- Department of Pharmaceutical Analysis, Affiliated Hospital of Integrated Traditional Chinese and Western Medicine, Nanjing University of Chinese Medicine, Nanjing, 210028, P.R. China.,Department of Metabolomics, Jiangsu Province Academy of Traditional Chinese Medicine and Jiangsu Branch of China Academy of Chinese Medical Sciences, Nanjing, 210028, P.R. China
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9
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Marchese A, Orhan IE, Daglia M, Barbieri R, Di Lorenzo A, Nabavi SF, Gortzi O, Izadi M, Nabavi SM. Antibacterial and antifungal activities of thymol: A brief review of the literature. Food Chem 2016; 210:402-14. [PMID: 27211664 DOI: 10.1016/j.foodchem.2016.04.111] [Citation(s) in RCA: 380] [Impact Index Per Article: 47.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Revised: 03/27/2016] [Accepted: 04/25/2016] [Indexed: 12/22/2022]
Abstract
Thymol (2-isopropyl-5-methylphenol) is the main monoterpene phenol occurring in essential oils isolated from plants belonging to the Lamiaceae family (Thymus, Ocimum, Origanum, and Monarda genera), and other plants such as those belonging to the Verbenaceae, Scrophulariaceae, Ranunculaceae, and Apiaceae families. These essential oils are used in the food industry for their flavouring and preservative properties, in commercial mosquito repellent formulations for their natural repellent effect, in aromatherapy, and in traditional medicine for the treatment of headaches, coughs, and diarrhea. Many different activities of thymol such as antioxidant, anti-inflammatory, local anaesthetic, antinociceptive, cicatrizing, antiseptic, and especially antibacterial and antifungal properties have been shown. This review aims to critically evaluate the available literature regarding the antibacterial and antifungal effects of thymol.
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Affiliation(s)
- Anna Marchese
- Microbiology Unit, IRCCS-San Martino-IST and DISC, University of Genoa, Italy
| | - Ilkay Erdogan Orhan
- Department of Pharmacognosy, Faculty of Pharmacy, Gazi University, 06330 Ankara, Turkey
| | - Maria Daglia
- Department of Drug Sciences, Medicinal Chemistry and Pharmaceutical Technology Section, University of Pavia, Italy
| | - Ramona Barbieri
- Microbiology Unit, IRCCS-San Martino-IST and DISC, University of Genoa, Italy
| | - Arianna Di Lorenzo
- Department of Drug Sciences, Medicinal Chemistry and Pharmaceutical Technology Section, University of Pavia, Italy
| | - Seyed Fazel Nabavi
- Applied Biotechnology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Olga Gortzi
- Department of Food Technology, Technological Educational Institution of Thessaly, Terma N. Temponera Str., Greece
| | - Morteza Izadi
- Health Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Seyed Mohammad Nabavi
- Applied Biotechnology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran.
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10
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Levent G, Harvey RB, Ciftcioglu G, Beier RC, Genovese KJ, He HL, Anderson RC, Nisbet DJ. In Vitro Effects of Thymol-β-D-Glucopyranoside on Salmonella enterica Serovar Typhimurium and Escherichia coli K88. J Food Prot 2016; 79:299-303. [PMID: 26818992 DOI: 10.4315/0362-028x.jfp-15-360] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Although thymol is bactericidal against many pathogens in vitro, its in vivo effectiveness against pathogens in the lower gastrointestinal tract is limited because of its rapid absorption in the proximal gut. Thymol-β-<small>D</small>-glucopyranoside (β-thymol), a conjugated form of thymol, can deliver thymol to the lower gastrointestinal tract and has shown antibacterial effects. In the present study, we examined the in vitro effects of β-thymol on Salmonella enterica serovar Typhimurium (ST) and Escherichia coli K88 (K88). We inoculated one-half strength Mueller-Hinton broth with 5.8 ± 0.09 log CFU/ml novobiocin- and naladixic acid-resistant (NN) ST (NVSL 95-1776) and 5.1 ± 0.09 log CFU ml(-1) NN-resistant K88, with or without porcine feces (0.1% [wt/vol]) (fecal incubations). The resultant bacterial suspensions were distributed under N2 to triplicate sets of tubes to achieve initial concentrations of 0, 3, 6, and 12 mM for ST treatments and 0, 3, 12, and 30 mM for K88 treatments. Samples were incubated at 39°C and then plated onto NN-containing brilliant green agar and NN-containing MacConkey agar; ST and K88 CFU concentrations were determined via 10-fold dilutions, and viable cell counts were performed at 0, 6, and 24 h. No differences in ST CFU counts were observed in β-thymol-treated tubes without the added porcine feces (i.e., pure culture) at 6 or 24 h. However, in tubes that contained fecal incubations, ST CFU counts were reduced (P < 0.05) from controls at 6 h in tubes treated with 6 and 12 mM β-thymol, whereas in tubes treated with 3, 6, and 12 mM β-thymol the CFU counts were reduced (P < 0.05) at 24 h. No differences were observed in K88 CFU counts in pure culture or in fecal incubations at 6 h, but K88 CFU counts were reduced (P < 0.05) in both pure and fecal incubations at 24 h. The results from this study demonstrate that β-thymol, in the presence of fecal suspensions, has anti-Salmonella and anti-E. coli effects, suggesting a role of β-glycoside-hydrolyzing microbes for the release of bactericidal thymol from β-thymol.
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Affiliation(s)
- G Levent
- Food and Feed Safety Research Unit, Agricultural Research Service, U.S. Department of Agriculture, 2881 F&B Road, College Station, Texas 77845, USA; Department of Food Hygiene and Technology, Faculty of Veterinary Medicine, Istanbul University, 34320 Istanbul, Turkey
| | - R B Harvey
- Food and Feed Safety Research Unit, Agricultural Research Service, U.S. Department of Agriculture, 2881 F&B Road, College Station, Texas 77845, USA.
| | - G Ciftcioglu
- Department of Food Hygiene and Technology, Faculty of Veterinary Medicine, Istanbul University, 34320 Istanbul, Turkey
| | - R C Beier
- Food and Feed Safety Research Unit, Agricultural Research Service, U.S. Department of Agriculture, 2881 F&B Road, College Station, Texas 77845, USA
| | - K J Genovese
- Food and Feed Safety Research Unit, Agricultural Research Service, U.S. Department of Agriculture, 2881 F&B Road, College Station, Texas 77845, USA
| | - H L He
- Food and Feed Safety Research Unit, Agricultural Research Service, U.S. Department of Agriculture, 2881 F&B Road, College Station, Texas 77845, USA
| | - R C Anderson
- Food and Feed Safety Research Unit, Agricultural Research Service, U.S. Department of Agriculture, 2881 F&B Road, College Station, Texas 77845, USA
| | - D J Nisbet
- Food and Feed Safety Research Unit, Agricultural Research Service, U.S. Department of Agriculture, 2881 F&B Road, College Station, Texas 77845, USA
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