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Antimicrobial activity of tea polyphenols

Arpita Basu, Emily Masek, Jeffrey L Ebersole
Periodontitis, which is a chronic infection and disease of the periodontium, is a significant global health burden and is linked to other chronic health conditions such as diabetes and cardiovascular diseases. Dietary polyphenols present in a wide variety of plant-based foods, herbs, and botanicals have been shown to exert antimicrobial, anti-inflammatory, and reduced osteoclast and alveolar bone loss activities in animal models of periodontitis. Polyphenol-containing beverages and foods especially green tea and its active catechin epigallocatechin-3-gallate, cranberries, pomegranates, and fruit and vegetable extracts have reported bacteriostatic/bactericidal activity against microbial species such as P...
July 20, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Sainan Zheng, Liying Hao, Lei Zhang, Kun Wang, Wenyue Zheng, Xiuqing Wang, Xuedong Zhou, Wei Li, Linglin Zhang
New materials with good purification of water quality (heavy metal ions removal and inhibition of bacteria) have increasingly attracted more research attentions. Considering the advantages of zinc oxide (ZnO) and tea polyphenol functionalized and reduced graphene oxide (TPG), the TPG-ZnO composites were prepared under moderate hydrothermal method and characterized by various methods. Lead ions (Pb2+) and Streptococcus mutans (S. mutans) were used to evaluate the adsorption capacity and antimicrobial activity of the TPG-ZnO, respectively...
July 1, 2018: Journal of Biomedical Nanotechnology
Mingyue Feng, Long Yu, Peitao Zhu, Xiangping Zhou, Hongsheng Liu, Yunyi Yang, Jiaqiao Zhou, Chengcheng Gao, Xianyang Bao, Pei Chen
Starch films incorporated with tea polyphenol (TP) were developed to produce active food packaging. The effect of the incorporation of TP with different content on the structure, physicochemical properties, antioxidant activity and antimicrobial activity of the starch films was systematically evaluated. Results showed that TP was well dispersed in the starch matrix, which induced a slight influence on the surface and barrier properties of the films. TP addition led to an important improvement in antioxidant capability, as well as inhibition efficiency against the microorganisms of S...
September 15, 2018: Carbohydrate Polymers
Tao Nie, Chenlu Zhang, Antian Huang, Ping Li
The high antimicrobial activity of epigallocatechin gallate (EGCG), the most bioactive component of tea polyphenol with a number of health benefits, is well-known. However, little is known about the mechanism involved. Here, we discovered the relationship between reactive oxygen species (ROS), the Cpx system, and EGCG-mediated cell death. We first found an increase in ampicillin resistance as well as the transcription level of a LD-transpeptidase (LD-TPase) involved in cell wall synthesis; ycbB transcription was upregulated whereas that of another LD-TPase, ynhG , appeared to be constant after a short exposure of Escherichia coli to sub-inhibitory doses of EGCG...
2018: Frontiers in Microbiology
Denial Mahata, Ahindra Nag, Golok B Nando, Santi M Mandal, Octavio L Franco
Green chemistry polymers from renewable resources have recently received much more attention from pharmaceutical researchers. However, the appropriate application of a polymer depends on its chemical nature, biocompatibility and microstructure. Here, tannin polyphenols from the common beverage, tea, are used to develop a novel self-assembled porous capsule as a microstructure of hydrogel for versatile biological applications, such as drug delivery, antioxidant and wound healing activity. Hydrogel has been successfully used for the delivery of both anticancer and antimicrobial drugs...
April 1, 2018: Journal of Nanoscience and Nanotechnology
Azam Ashrafi, Maryam Jokar, Abdorreza Mohammadi Nafchi
An active film composed of chitosan and kombucha tea (KT) was successfully prepared using the solvent casting technique. The effect of incorporation of KT at the levels 1%-3% w/w on the physical and functional properties of chitosan film was investigated. The antimicrobial activity of chitosan/KT film against Escherichia coli and Staphylococcus aureus was evaluated using agar diffusion test, and its antioxidant activity was determined using DPpH assay. The results revealed that incorporation of KT into chitosan films improved the water vapor permeability (from 256...
March 2018: International Journal of Biological Macromolecules
Hakhee Kim, Takeshi Kawazoe, Kazuaki Matsumura, Shigehiko Suzuki, Suong-Hyu Hyon
Skin grafts can be preserved by cryopreservation and refrigerated storage at 4°C. Epigallocatechin-3- O-gallate (EGCG) enhances the viability of stored skin grafts and also extends the storage time up to 7 weeks at 4°C. EGCG, the major polyphenolic constituent present in green tea, has potent antioxidant, antimicrobial, antiproliferative, and free radical scavenging effects. This study examined the effects of EGCG on skin cryopreservation. Skin sample biopsy specimens from GFP rats were previously treated with/without EGCG then moved to -196°C...
May 2009: Cell Transplantation
Xiaomei Xiao, Liangmei He, Yayun Chen, Longhuo Wu, Lin Wang, Zhiping Liu
Camellia oleifera Abel is a member of Camellia, and its seeds are used to extract Camellia oil, which is generally used as cooking oil in the south of China. Camellia oil consists of unsaturated fatty acids, tea polyphenol, squalene, saponin, carrot element and vitamins, etc. The seed remains after oil extraction of C. oleifera Abel are by-products of oil production, named as Camellia oil cake. Its extracts contain bioactive compounds including sasanquasaponin, flavonoid and tannin. Major components from Camellia oil and its cake have been shown to have anti-inflammatory, antioxidative, antimicrobial and antitumor activities...
November 2017: Future Medicinal Chemistry
Vanesa G Correa, Geferson A Gonçalves, Anacharis B de Sá-Nakanishi, Isabel C F R Ferreira, Lillian Barros, Maria I Dias, Eloá A Koehnlein, Cristina G M de Souza, Adelar Bracht, Rosane M Peralta
Yerba mate (Ilex paraguariensis) is a plant that grows naturally in South America. From its leaves and thin stems different kinds of beverages are prepared (chimarrão, tererê and tea mate), all of them rich in bioactive substances. The aim of this study was to evaluate the influence of in vitro gastrointestinal digestion and colonic fermentation on the stability of the polyphenols and on the antioxidant, antimicrobial and antitumoral activities of the yerba mate beverages. The phenolic chromatographic profile revealed that both the in vitro digestion and the colonic fermentation caused a pronounced decrease in 3,5-O-dicaffeoylquinic acid and 5-O-caffeoylquinic acid in the preparations...
December 15, 2017: Food Chemistry
Florence Malongane, Lyndy J McGaw, Fhatuwani N Mudau
Tea is one of the most widely consumed non-alcoholic beverages in the world next to water. It is classified as Camellia sinensis and non-Camellia sinensis (herbal teas). The common bioactive compounds found mainly in green teas are flavan-3-ols (catechins) (also called flavanols), proanthocyanidins (tannins) and flavonols. Black tea contains theaflavins and thearubigins and white tea contains l-theanine and gamma-aminobutyric acid (GABA), while herbal teas contain diverse polyphenols. Phytochemicals in tea exhibit antimicrobial, anti-diabetic and anti-cancer activities that are perceived to be helpful in managing chronic diseases linked to lifestyle...
November 2017: Journal of the Science of Food and Agriculture
M Bellés, V Alonso, P Roncalés, J A Beltrán
Different concentrations of two aqueous extracts from green tea leaves and borage seeds with potential antioxidant activity were evaluated in lamb leg chops. Chops were sprayed with 0.005, 0.05, 0.5, 5% (p/v) green tea extracts (T) and 0.5, 5 and 10% (p/v) borage seed extracts (B) and displayed under retail conditions for 13days. Total polyphenols, TBARS, colour, microbial and sensory analyses were performed. The extracts showed a concentration-dependent action; the minimum concentration of polyphenols which significantly reduced lipid oxidation was 2...
July 2017: Meat Science
Bibi Sedigheh Fazly Bazzaz, Sahar Sarabandi, Bahman Khameneh, Hossein Hosseinzadeh
OBJECTIVES: Bacterial resistant infections have become a global health challenge and threaten the society's health. Thus, an urgent need exists to find ways to combat resistant pathogens. One promising approach to overcoming bacterial resistance is the use of herbal products. Green tea catechins, the major green tea polyphenols, show antimicrobial activity against resistant pathogens. The present study aimed to investigate the effect of catechins, green tea extract, and methylxanthines in combination with gentamicin against standard and clinical isolates of Staphylococcus aureus (S...
December 2016: Journal of Pharmacopuncture
Xian Hui, Qiao Yue, Dan-Dan Zhang, Heng Li, Shao-Qing Yang, Wen-Yun Gao
1-Deoxy-D-xylulose 5-phosphate reductoisomerase (DXR) is the first committed enzyme in the 2-methyl-D-erythritol 4-phosphate (MEP) terpenoid biosynthetic pathway and is also a validated antimicrobial target. Theaflavins, which are polyphenolic compounds isolated from fermented tea, possess a wide range of pharmacological activities, especially an antibacterial effect, but little has been reported on their modes of antimicrobial action. To uncover the antibacterial mechanism of theaflavins and to seek new DXR inhibitors from natural sources, the DXR inhibitory activity of theaflavins were investigated in this study...
December 12, 2016: Scientific Reports
Xian Hui, Hui Liu, Fang-Lin Tian, Fei-Fei Li, Heng Li, Wen-Yun Gao
1-Deoxy-d-xylulose 5-phosphate reductoisomerase (DXR) is the first committed enzyme in the MEP terpenoid biosynthetic pathway and also a validated antimicrobial target. Green tea which is rich in polyphenolic components such as the catechins, possesses a plenty of pharmacological activities, in particular an antibacterial effect. To uncover the antibacterial mechanism of green tea and to seek new DXR inhibitors from natural sources, the DXR inhibitory activity of green tea and its main antimicrobial catechins were investigated in this study...
September 2016: Fitoterapia
Valeria Romanucci, Giovanni Di Fabio, Daniele D'Alonzo, Annalisa Guaragna, Giovanni Scapagnini, Armando Zarrelli
Sideritis species have been used in folk medicine for their antimicrobial, antiulcerogenic, digestive and anti-inflammatory properties. Over the years, the phytochemistry of the genus Sideritis has been studied, and various terpenoids, sterols, coumarins and especially flavonoid aglycones and glycosides have been identified. In particular, species from the Balkan Peninsula have been studied and were found to be rich in flavonoids, with valuable antioxidant activity. In the folk medicine of the Balkan countries, Sideritis raeseri is used as a herbal tea in the treatment of inflammation, gastrointestinal disorders and coughs, and also as a tonic, whereas extracts are used as a component of dietary supplements for anaemia...
January 2017: Journal of the Science of Food and Agriculture
Lanlan Bai, Shiaki Takagi, Tasuke Ando, Hiroshi Yoneyama, Kumiko Ito, Hiroyuki Mizugai, Emiko Isogai
Epigallocatechin gallate (EGCG) is the major polyphenolic compound of green tea. Polyphenolic compounds were extracted from the leaf of Camellia sinensis (Japanese green tea), and the minimum inhibitory concentration against canine oral bacteria was measured. Subsequently, we investigated the inhibitory effects of polyphenolic compounds and EGCG on the growth of canine oral bacteria. EGCG showed antimicrobial activity against a model bacterium, Streptococcus mutans. Our results indicate that EGCG can inhibit the growth and biofilm formation of S...
October 1, 2016: Journal of Veterinary Medical Science
Karima Dhaouadi, Manel Belkhir, Faten Raboudi, Elsa Mecha, Imen Ghommeme, Maria Do Rosario Bronze, Hajer Ammar, Sami Fattouch
The chemical stability of the green tea (GT) preparation during refrigerated storage was investigated following the addition of mint (MS) or pomegranate (PS) syrups, a common habit in the Mediterranean countries that improves the savor of this popular beverage. The supernatants recovered by centrifuging GT supplemented or not with mint (GTMS) or pomegranate (GTPS) syrup were examined for their polyphenolic profiles using the high performance liquid chromatography with diode array detection and electrospray ionization-mass spectrometry...
February 2016: Journal of Food Science and Technology
Li He, Likou Zou, Qianru Yang, Jinghua Xia, Kang Zhou, Yuanting Zhu, Xinfeng Han, Biao Pu, Bin Hu, Wenwen Deng, Shuliang Liu
Antimicrobial activities of nisin, tea polyphenols (TPs), and chitosan, and their combinations were evaluated against both Gram-positive bacteria (GPB) and Gram-negative bacteria (GNB) by the agar dilution method. Results showed that the MIC of nisin was 2.44 to 1250 mg/L for GPB and reached 5000 mg/L for GNB. The MICs of TPs and chitosan were 313 to 625 mg/L and 469 mg/L for GNB, and 156 to 5000 mg/L and 234 to 938 mg/L for GPB, respectively. These results indicated that TPs and chitosan exhibited inhibitory effects against both GPB and GNB, whereas nisin inhibited the growth of GPB only...
June 2016: Journal of Food Science
Murphy L Y Wan, K H Ling, M F Wang, Hani El-Nezami
SCOPE: Green tea has been known to confer numerous health benefits such as the prevention of cardiovascular disease, cancers, and obesity. Epigallocatechin-3-gallate (EGCG) is the major polyphenol present in green tea. Since EGCG is a food-derived component, intestinal epithelial cells lining the gastrointestinal tract are constantly and directly exposed to EGCG. It is anticipated that EGCG can exert beneficial effects in the intestine. The aim of this study was to explore the protective effects of EGCG on intestinal barrier functions against bacterial translocation by using a porcine jejunal epithelial cell line, IPEC-J2...
May 2016: Molecular Nutrition & Food Research
R Li, P Fei, C X Man, B B Lou, J T Niu, J Feng, L H Sun, M Y Li, Y J Jiang
This study evaluated the antimicrobial activity of tea polyphenols (TP) against 4 Cronobacter sakazakii strains with different sequence types (ST) isolated from powdered infant formula (PIF). The results showed that in normal saline, 5mg/mL of TP (pH 3.44) could eliminate approximately 7.0 log cfu/mL of C. sakazakii within 1 h; in rehydrated PIF, after acidification with HCl (pH 3.55), TP showed a stronger antibacterial activity compared with the controls (malic acid, ascorbic acid, and citric acid). Further, some differences were obvious in tolerance to TP between C...
February 2016: Journal of Dairy Science
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