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Green tea extract

Junfeng Li
(-)-Epigallocatechin-3-gallate (EGCG) is a polyphenol monomer compound extracted and separated from green tea, and is a key catechin in green tea. Recent research has identified that EGCG is equipped with important biological activities, including antitumor, antioxidant, anti-inflammation, blood fat reduction and radiation protection abilities. In the current study, it was investigated whether EGCG exerts a neuroprotective effect on AIT and examined the possible underlying mechanism. The present study sought to establish an experimental autoimmune thyroiditis (AIT) rat model and to investigate the neuroprotective effect of EGCG in this model...
January 2018: Experimental and Therapeutic Medicine
Ju Hee Choi, Jin-Yong Kim, Eun Tak Jeong, Tae Ho Choi, Tae Mi Yoon
The purpose of this study was to investigate the applicability of green tea seed (GTS) extract as a natural preservative in food. Food preservative ability and mutagenicity studies of GTS extract and identification of antimicrobial compounds from GTS extract were carried out. The GTS extract showed only anti-yeast activity against Candida albicans with MIC value of 938μg/mL and Zygosaccharomyces rouxii with a MIC of 469μg/mL. The active compounds were identified as theasaponin E1 (1), assamsaponin A (2), and assamsaponin B (3)...
March 2018: Food Research International
Bor-Yann Chen, Jia-Hui Liao, An-Wei Hsu, Po-Wei Tsai, Chung-Chuan Hsueh
This first-attempt study used extracts of appropriate antioxidant abundant Camellia and non-Camellia tea and medicinal herbs as model ESs to stably intensify bioelectricity generation performance in microbial fuel cells (MFCs). As electron shuttles (ESs) could stimulate electron transport phenomena by significant reduction of electron transfer resistance, the efficiency of power generation for energy extraction in microbial fuel cells (MFCs) could be appreciably augmented. Using environmentally friendly natural bioresource as green bioresource of ESs is the most promising to sustainable practicability...
February 2, 2018: Bioresource Technology
Hirota Fujiki, Tatsuro Watanabe, Eisaburo Sueoka, Anchalee Rawangkan, Masami Suganuma
Cancer preventive activities of green tea and its main constituent, (-)-epigallocatechin gallate (EGCG) have been extensively studied by scientists all over the world. Since 1983, we have studied the cancer chemopreventive effects of EGCG as well as green tea extract and underlying molecular mechanisms. The first part of this review summarizes groundbreaking topics with EGCG and green tea extract: 1) Delayed cancer onset as revealed by a 10-year prospective cohort study, 2) Prevention of colorectal adenoma recurrence by a double-blind randomized clinical phase II trial, 3) Inhibition of metastasis of B16 melanoma cells to the lungs of mice, 4) Increase in the average value of Young's moduli, i...
January 31, 2018: Molecules and Cells
Monallisa Alves Ferreira, Anna Paula Oliveira Gomes, Ana Paula Guimarães de Moraes, Maria Luiza Ferreira Stringhini, João Felipe Mota, Alexandre Siqueira Guedes Coelho, Patrícia Borges Botelho
BACKGROUND & AIMS: Both green tea and metformin are used as adjuvants to treat and prevent complications associated with obesity; however, studies comparing their action and interaction in non-diabetic overweight women have not been reported. Thus, the current study evaluated the effects of green tea extract and metformin, both individually and in combination, on type 2 diabetes risk factors in non-diabetic overweight women. METHODS: A total of 120 overweight women were randomly assigned in a double-blind manner to 1 of 4 groups, as follows: control (n = 29; 1 g of cellulose), green tea (n = 32; 1 g of dry green tea extract), metformin (n = 28; 1 g of metformin), and green tea + metformin (n = 31; 1 g of dry green tea extract + 1 g of metformin)...
December 2017: Clinical Nutrition ESPEN
Camila A Zamperini, Ana K Bedran-Russo
This study investigated the remineralization effect of experimental mint formulations containing bioactive agents (xylitol; green tea extract, GT; and amorphous calcium phosphate, ACP) in the progression of artificially induced root caries. Root caries lesions were induced by demineralization solution (pH 4.6; 96 h; 37°C). The lesions were treated with mint A, mint B, mint C, xylitol, GT, ACP, or remineralization solution (RS; negative control). Specimens were pH-cycled through treatments (5×/day; 3 min) and 6 cycles of acidic (pH 5...
February 8, 2018: Caries Research
Shubhadeep Roychoudhury, Marek Halenar, Katarina Michalcova, Sangeeta Nath, Miroslava Kacaniova, Adriana Kolesarova
Green tea is a commonly used beverage and green tea extract is a common dietary herbal supplement manufactured into different over-the-counter products. The aim of this in vitro study was to examine the steroid hormone secretion (progesterone and 17-β estradiol), proliferation and apoptosis of porcine ovarian granulosa cells after addition of green tea extract. Granulosa cells were incubated with green tea extract at five doses (0.1, 1, 10, 100 and 200 μg/ml) and the release of hormones by granulosa cells was assessed by EIA after 24 h exposure...
January 30, 2018: Reproductive Biology
Peigen Yu, Mei Yin Low, Weibiao Zhou
In order to develop products that would be preferred by consumers, the effects of the chemical compositions of ready-to-drink green tea beverages on consumer liking were studied through regression analyses. Green tea model systems were prepared by dosing solutions of 0.1% green tea extract with differing concentrations of eight flavour keys deemed to be important for green tea aroma and taste, based on a D-optimal experimental design, before undergoing commercial sterilisation. Sensory evaluation of the green tea model system was carried out using an untrained consumer panel to obtain hedonic liking scores of the samples...
January 2018: Food Research International
Yilong Ma, Yafang Shang, Fengru Liu, Wenqing Zhang, Caihong Wang, Danye Zhu
Zirconium phosphate (ZrP) was prepared and employed to separate strictinin-rich tea polyphenol from Chinese green tea extracts. The influences of ZrP calcination temperatures, green tea extraction conditions, and the amounts of ZrP on the isolation of strictinin-rich tea polyphenol were evaluated; the absorption and desorption dynamics of strictinin on ZrP were also determined. Our results revealed that the HPLC content of strictinin increased from 4.96% in 70% ethanol extract of green tea to 58.2% in isolated strictinin-rich tea polyphenol obtained by ZrP-900 (ZrP calcined at 900°C)...
January 2018: Journal of Food and Drug Analysis
Rabia Johnson, Dalene de Beer, Phiwayinkosi V Dludla, Daneel Ferreira, Christo J F Muller, Elizabeth Joubert
Aspalathin is a C-glucosyl dihydrochalcone that is abundantly present in Aspalathus linearis. This endemic South African plant, belonging to the Cape Floristic region, is normally used for production of rooibos, a herbal tea. Aspalathin was valued initially only as precursor in the formation of the characteristic red-brown colour of "fermented" rooibos, but the hype about the potential role of natural antioxidants to alleviate oxidative stress, shifted interest in aspalathin to its antioxidant properties and subsequently, its potential role to improve metabolic syndrome, a disease condition interrelated with oxidative stress...
January 31, 2018: Planta Medica
Doglas Cecchin, Ana Paula Farina, Ana Karina Bedran-Russo
Aim: To evaluate the effects of sodium hypochlorite (NaOCl), chlorhexidine (CHX), and two naturally derived reducing agents on the bond strength of epoxy resin-based sealer to root dentin. Materials and Methods: A total of 60 single-rooted human teeth were prepared using ProTaper (Dentsply Tulsa Dental Specialties, Johnson City, TN, USA) and an irrigation protocol including 5% NaOCl or 2% CHX gel, and ethylenediaminetetraacetic acid (EDTA), for smear layer removal...
September 2017: Journal of Conservative Dentistry: JCD
Ana Claudia Losinskas Hachul, Valter Tadeu Boldarine, Nelson Inácio Pinto Neto, Mayara Franzoi Moreno, Patricia Oliveira Carvalho, Alexandra C H F Sawaya, Eliane Beraldi Ribeiro, Claudia Maria Oller do Nascimento, Lila Missae Oyama
The objective was to investigate the effects of the maternal consumption of the green tea extract during pregnancy and lactation on mothers and offspring metabolism. The female Wistar rats, on the first day of pregnancy until the end of lactation, was divided into groups: MC- received water and ME- received green tea extract (400 mg/kg body weight/day), both ingested control diet. After lactation, at day 28th post-partum, the mothers and pups from each mother were euthanized and composed the groups: FC- pup from mother received water and FE- pup from mother received green tea extract...
January 30, 2018: Scientific Reports
Z Y Ozkan, M Cakirgoz, E S Kaymak, E Erdim
The effectiveness of green tea (Camellia sinensis) and pomegranate (Punica granatum) extracts for the production of iron nanoparticles and their application for color removal from a textile industry wastewater was investigated. Polyphenols in extracts act as reducing agents for iron ions in aqueous solutions, forming iron nanoparticles. Pomegranate extract was found to have almost a 10-fold higher polyphenolic content than the same amount of green tea extract on a mass basis. However, the size of the synthesized nanoparticles did not show a correlation with the polyphenolic content...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Tayyaba Afsar, Suhail Razak, Maria Shabbir, Muhammad Rashid Khan
BACKGROUND: Acacia hydaspica belongs to family leguminosae possess antioxidant, anti-inflammatory and anticancer activities. During our search for antioxidant compounds from A. hydaspica, we carried out bioassay guided fractionation and obtained antioxidant compounds with free radical scavenging activity. MATERIALS AND METHODS: The polyphenol compounds in the plant extract of A. hydaspica were isolated by combination of different chromatographic techniques involving vacuum liquid chromatography and medium pressure liquid chromatography...
January 25, 2018: Chemistry Central Journal
Shingen Misaka, Osamu Abe, Hideyuki Sato, Tomoyuki Ono, Yayoi Shikama, Satomi Onoue, Hirooki Yabe, Junko Kimura
PURPOSE: The objective of this study is to assess the effects of green tea and its major catechin component, (-)-epigallocatechin gallate (EGCG), on CYP2C9-mediated substrate metabolism in vitro, and the pharmacokinetics of fluvastatin in healthy volunteers. METHODS: The metabolism of diclofenac and fluvastatin in human recombinant CYP2C9 was investigated in the presence of EGCG. In a randomized three-phase crossover study, 11 healthy volunteers ingested a single 20-mg dose of fluvastatin with green tea extract (GTE), containing 150 mg of EGCG, along with water (300 mL), brewed green tea (300 mL), or water (300 mL) after overnight fasting...
January 24, 2018: European Journal of Clinical Pharmacology
Giampiero Barbieri, Monica Bergamaschi, Marco Franceschini, Germana Barbieri
Pork loins were cooked with 5 different polyphenol-rich vegetable extracts: Polygonum cuspidatum, oregano extract, rosemary extract, white grape extract and green tea extract. These extracts were added to brine, taking into account their solubility, for subsequent injection and cooking. Loins with added vegetable extracts exhibited higher antioxidant effect compared to controls, as shown by the oxidized/reduced ascorbate ratio, the potential of reduction and the fat oxidation rate. However, some effects were observed in terms of taste, colour changes and, in some cases (green tea and oregano), presence of blots on meat slices...
January 12, 2018: Meat Science
Margit Lw Juhász, Melissa K Levin, Ellen S Marmur
BACKGROUND: The cosmeceutical industry is an ever-growing and in demand market, especially in Asia. Korea has been on the forefront of creating the newest generation and most innovative cosmeceuticals products including ingredients such as snail secretions, starfish powder, botanical extracts, green tea, and red ginseng. Given their increasing prevalence in the cosmeceutical industry, scientists have been conducting investigations into these extracts and their properties. OBJECTIVE: To summarize the current literature surrounding multiple natural ingredients found in Korean cosmeceutical products...
January 24, 2018: Journal of Cosmetic Dermatology
Sisse Jongberg, Mari Ann Tørngren, Leif H Skibsted
Background: Phenolic plant extracts are added as antioxidants in meat to prevent lipid oxidation, but depending on the concentration applied, may affect proteins either through covalent interactions or by serving as a prooxidant. Methods: Brine-injected pork chops prepared with green tea extract (25-160 ppm gallic acid equivalents (GAE)), or maté extract (25-160 ppm GAE) and stored (5 °C, 7 days) in high-oxygen atmosphere packaging (MAP: 80% O2 and 20% CO2) were analyzed for color changes, lipid oxidation by thiobarbituric acid reactive substances (TBARS), and protein oxidation evaluated by thiol loss and protein radical formation by electron spin resonance (ESR) spectroscopy, and compared to a control without antioxidant...
January 22, 2018: Medicines (Basel, Switzerland)
Hanyang Sun, Yuhui Chen, Mei Cheng, Xin Zhang, Xiaojie Zheng, Zhicheng Zhang
In the present study, polyphenols from green tea (GTP), oolong tea (OTP) and black tea (BTP) were prepared by extraction with hot water and polyamide column chromatography. In antioxidant assay in vitro, each tea polyphenols exhibited potential activity; the intestinal absorption of GTP, OTP and BTP was investigated individually by Caco-2 transwell system, and each sample was poorly transported, illustrating a low transport rate for tea polyphenols through cell monolayers. The effects of GTP, OTP and BTP on human intestinal microbiota were also evaluated, and each sample induced the proliferation of certain beneficial bacteria and inhibited Bacteroides - Prevotella and Clostridium histolyticum ...
January 2018: Journal of Food Science and Technology
Berna Özalp Özen, Ayla Soyer
The effects of different plant extracts [green tea extract (GTE), grape seed extract (GSE), and pomegranate rind extract (PRE)] at a level of 100 ppm equivalent phenolics and butylated hydroxytoluene (BHT) on the changes in quality of fish (Scomber scombrus) mince during 6 months frozen storage at -18 ± 1 °C were investigated. During storage, significant oxidative reactions in both the lipids and proteins were observed with the increase in thiobarbituric acid reactive substances (TBARS) and carbonyls and decrease in sulphydryl groups and protein solubility...
January 2018: Journal of Food Science and Technology
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