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Green tea extract

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https://www.readbyqxmd.com/read/29209613/evaluation-of-phenolic-phytochemical-enriched-commercial-plant-extracts-on-the-in-vitro-inhibition-of-%C3%AE-glucosidase
#1
Allie Brown, Danielle Anderson, Kenneth Racicot, Sarah J Pilkenton, Emmanouil Apostolidis
Green tea (GT), cranberry (CR), and tart cherry extracts were evaluated for their ability to inhibit yeast α-glucosidase, relevant to glucose uptake. The total phenolic content (TPC), antioxidant activity, and in vitro inhibitory activity of yeast α-glucosidase were examined for the extracts in the present study. GT had higher TPC and antioxidant activity, but CR demonstrated a greater α-glucosidase inhibitory activity, on phenolic basis. CR was fractionated using LH-20 column chromatography into two fractions: 30% methanol (CME) and 70% acetone (CAE)...
2017: Frontiers in Nutrition
https://www.readbyqxmd.com/read/29207823/an-in-vitro-study-to-compare-the-effect-of-different-types-of-tea-with-chlorhexidine-on-streptococcusmutans
#2
Dona Elizabeth George, Roshan Shetty, Pooja J Shetty, Leslie Allan Gomes
Introduction: Tea is the second most commonly consumed beverage in the world after water. The leaf and bud of the plant Camellia sinensis produces tea. The different forms of tea are 'non-fermented' green tea, 'semi-fermented' oolong tea and 'fermented' black tea according to the manufacturing process. Streptococcus mutans is the main causative organism in dental caries and plaque formation. Aim: The present study was undertaken to determine the antibacterial effectiveness of aqueous and ethanol extracts of green tea, black tea and oolong tea against S...
September 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/29190550/green-tea-extract-protects-against-hepatic-nf%C3%AE%C2%BAb-activation-along-the-gut-liver-axis-in-diet-induced-obese-mice-with-nonalcoholic-steatohepatitis-by-reducing-endotoxin-and-tlr4-myd88-signaling
#3
Jinhui Li, Geoffrey Y Sasaki, Priyankar Dey, Chureeporn Chitchumroonchokchai, Allison N Labyk, Joshua D McDonald, Joshua B Kim, Richard S Bruno
Green tea extract (GTE) reduces NFκB-mediated inflammation during nonalcoholic steatohepatitis (NASH). We hypothesized that its anti-inflammatory activities would be mediated in a Toll-like receptor 4 (TLR4)-dependent manner. Wild-type (WT) and loss-of-function TLR4-mutant (TLR4m) mice were fed a high-fat diet containing GTE at 0 or 2% for 8 weeks before assessing NASH, NFκB-mediated inflammation, TLR4 and its adaptor proteins MyD88 and TRIF, circulating endotoxin, and intestinal tight junction protein mRNA expression...
November 3, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/29175576/potential-role-of-the-mitochondria-as-a-target-for-the-hepatotoxic-effects-of-epigallocatechin-3-gallate-in-mice
#4
Karma D James, Mary J Kennett, Joshua D Lambert
Green tea and (-)-epigallocatechin-3-gallate (EGCG) have been studied for their obesity-related health effects. Many green tea extract (GTE)-based dietary supplements are commercially-available. Although green tea beverage has a long history of safe use, a growing number of case-reports have linked GTE-based supplements to incidents of hepatotoxicity. Animal studies support the hepatotoxic potential of GTE and EGCG, but the mechanisms remain unclear. Here, we examined the hepatotoxic effects of EGCG in C57BL/6J mice and evaluated changes in hepatic antioxidant response and mitochondria structure and function...
November 22, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29168179/phenolic-and-physicochemical-stability-of-a-functional-beverage-powder-mixture-during-storage-effect-of-the-microencapsulant-inulin-and-food-ingredients
#5
Dalene de Beer, Claire E Pauck, Marique Aucamp, Wilna Liebenberg, Nicole Stieger, Marieta van der Rijst, Elizabeth Joubert
BACKGROUND: The need for a convenience herbal iced tea product with reduced kilojoules merited investigation of the shelf-life of powder mixtures containing a green Cyclopia subternata Vogel (honeybush) extract with proven blood glucose-lowering activity and alternative sweetener mixture. RESULTS: Prior to long-term storage testing, the wettability of powder mixtures containing food ingredients and the compatibility of their components were confirmed using the static sessile drop method and isothermal microcalorimetry, respectively...
November 23, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29161690/catechins-blunt-the-effects-of-oxldl-and-its-primary-metabolite-phosphatidylcholine-hydroperoxide-on-endothelial-dysfunction-through-inhibition-of-oxidative-stress-and-restoration-of-enos-in-rats
#6
Hao-Hsiang Chang, Chen-Yen Chien, Kuo-Hsin Chen, Shih-Chung Huang, Chiang-Ting Chien
BACKGROUND/AIMS: We explored the effects of catechins (decaffeinated green tea extracts containing (-)-epicatechin, (-)-epigallocatechin, (-)-epicatechin gallate and (-)-epigallocatechin gallate) on atherosclerosis risk factors, oxidized low-density lipoprotein (oxLDL) and its primary metabolite, phosphatidylcholine hydroperoxide (PCOOH) induced oxidative injury in cultured endothelial cell line and rats. METHODS: We used endothelial cell line and male Wistar rats to determine the effect of catechins on oxLDL or PCOOH induced oxidative injury including apoptosis, H2O2 level, vascular responses and urinary 8-isoprostane and nitrite/nitrate concentration...
November 22, 2017: Kidney & Blood Pressure Research
https://www.readbyqxmd.com/read/29157815/an-efflux-pump-mexab-oprm-of-pseudomonas-aeruginosa-is-associated-with-antibacterial-activity-of-epigallocatechin-3-gallate-egcg
#7
Rashmi Kanagaratnam, Rida Sheikh, Fahad Alharbi, Dong H Kwon
BACKGROUND: Pseudomonas aeruginosa is a notorious multidrug resistant nosocomial pathogen. An efflux pump (MexAB-OprM) is the main contributor to the multidrug resistance in clinical isolates of P. aeruginosa. Epigallocatechin-3-gallate (EGCG), a polyphenolic compound extracted from green tea, exhibits antibacterial activity. It is unclear that molecular details of the antibacterial activity of EGCG, EGCG-effect on antibiotic susceptibility, and clinical relevance of EGCG in bacteria...
December 1, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/29156308/modulatory-effects-of-green-tea-extract-against-the-hepatotoxic-effects-of-4-nonylphenol-in-catfish-clarias-gariepinus
#8
A H Sayed, Hamdy A M Soliman
The antioxidant role of the green tea (Camellia sinensis) extract (GTE) was examined to remedy the toxic effects of (0.2mgl(-1)) 4-nonylphenol(4-NP). Biochemical parameters, antioxidant enzymes, liver lipid peroxidation (LPO), DNA fragmentation, and apoptosis as well as histopathology of liver of African catfish Clarias gariepinus were considered. Catfishes were divided into four groups: first group (control), second group (0.2mgl(-1) of 4-NP), third group (0.2mgl(-1)of 4-NP +100mg GTE l(-1)water), and fourth group (0...
November 17, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29146363/vortex-assisted-deep-eutectic-solvent-des-emulsification-liquid-liquid-microextraction-of-trace-curcumin-in-food-and-herbal-tea-samples
#9
Funda Aydin, Erkan Yilmaz, Mustafa Soylak
We developed a new microextraction method for separation and preconcentration of curcumin using deep eutectic solvent known as green solvent. Deep eutectic solvent (DES) formed by mixing of choline chloride and phenol was used as an extraction solvent in microextraction study to extract the curcumin at pH 4.0. The curcumin concentration in enriched DES phase was analyzed by UV-Visible spectrophotometer. The effect of parameters such as pH, mol ratio of DES composition, volume of DES, volume of tetrahydrofuran (THF) and sample volume were examined...
March 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29131612/functional-characterization-of-epitheaflagallin-3-o-gallate-generated-in-laccase-treated-green-tea-extracts-in-the-presence-of-gallic-acid
#10
Nobuya Itoh, Junji Kurokawa, Yasuhiro Isogai, Masaru Ogasawara, Takayuki Matsunaga, Tutomu Okubo, Yuji Katsube
Epitheaflagallin (ETFG) and epitheaflagallin 3-O-gallate (ETFGg) are minor polyphenols in black tea extract that are enzymatically synthesized from epigallocatechin (EGC) and epigallocatechin gallate (EGCg), respectively, in green tea extract via laccase oxidation in the presence of gallic acid. The constituents of laccase-treated green tea extract in the presence of gallic acid are thus quite different from those of non-laccase-treated green tea extract: EGC and EGCg are present in lower concentrations, and ETFG and ETFGg are present in higher concentrations...
November 13, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29129901/the-inhibitory-effects-of-anthocyanin-rich-sunrouge-tea-on-pancreatic-lipase-activity
#11
Nobuya Shirai
This study investigated the in vitro and in vivo effects of Sunrouge (SR), which is an anthocyaninrich green tea. Hot and cold water extracts (CWEX) of Yabukita (YK; regular green tea), SR second crop (SR2), and SR third crop (SR3) were prepared. The 50% inhibitory concentrations for YK, SR2, and SR3 CWEXs against pancreatic lipase in vitro were 12.3±2.8, 6.2±0.3, and 4.0±1.1 mg/mL, respectively. Epigallocatechin gallate (EGCG) accounted for 4.3%, 6.0%, and 6.3% of YK, SR2, and SR3 CWEXs, respectively. SR2 had the highest anthocyanin content of these three samples...
November 13, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/29129782/reactive-oxygen-species-production-triggers-green-tea-induced-anti-leukaemic-effects-on-acute-promyelocytic-leukaemia-model
#12
Cristiane Okuda Torello, Rodrigo Naoto Shiraishi, Fernanda Isabel Della Via, Tamara Cristina Lopes de Castro, Ana Leda Longhini, Irene Santos, André Luis Bombeiro, Cleide Lúcia Araujo Silva, Mary Luci de Souza Queiroz, Eduardo Magalhães Rego, Sara Teresinha Olalla Saad
Green tea (GT) has been consumed as a beverage for thousands of years because of its therapeutic properties observed over time. Because there is no sufficient evidence supporting the protective role of tea intake during the development of acute myeloid leukaemia, we herein study GT extract effects on an acute promyelocytic leukaemia model. Our results demonstrated that GT reduces leucocytosis and immature cells (blasts) in peripheral blood, bone marrow (BM), and spleen of leukaemic mice, parallel with an increase of mature cells in the BM...
November 10, 2017: Cancer Letters
https://www.readbyqxmd.com/read/29129232/effect-of-green-tea-on-plasma-leptin-and-ghrelin-levels-a%C3%A2-systematic-review-and-meta-analysis-of-randomized-controlled-clinical-trials
#13
Fahimeh Haghighatdoost, B Fatemeh Nobakht M Gh, Mitra Hariri
OBJECTIVE: The purpose of this study was to conduct a meta-analysis of randomized controlled trials (RCTs) to assess the effect of green tea on serum leptin and ghrelin concentrations. METHODS: We searched PubMed, ISI Web of Science, Scopus, and Google scholar databases up to December 2016. The searches included RCTs conducted in human adults, and studies on the effect of green tea and green tea extract on serum leptin and ghrelin concentrations as outcome variables...
January 2018: Nutrition
https://www.readbyqxmd.com/read/29124646/metal-availability-soil-nutrient-and-enzyme-activity-in-response-to-application-of-organic-amendments-in-cd-contaminated-soil
#14
Zhanbiao Yang, Lixia Liu, Yanfeng Lv, Zhang Cheng, Xiaoxun Xu, Junren Xian, Xuemei Zhu, Yuanxiang Yang
The study investigated the effects of organic amendments: green tea amendment (GTA) and oil cake amendment (OCA) on Cd bioavailability, soil nutrients, and soil enzyme activity in Cd-contaminated soil. The amendments were added to the soil at the doses of 1, 3, and 5% and were incubated for 45 days. Then, pakchoi cabbage was planted to test the remediation effect of the above two organic amendments. The diethylenetriaminepentaacetic acid (DTPA)-extractable Cd in GTA and OCA treatments was reduced by 14.69-27...
November 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29120370/amorphous-solid-dispersion-of-epigallocatechin-gallate-for-enhanced-physical-stability-and-controlled-release
#15
Yizheng Cao, Jing Teng, Jon Selbo
Epigallocatechin gallate (EGCG) has been recognized as the most prominent green tea extract due to its healthy influences. The high instability and low bioavailability, however, strongly limit its utilization in food and drug industries. This work, for the first time, develops amorphous solid dispersion of EGCG to enhance its bioavailability and physical stability. Four commonly used polymeric excipients are found to be compatible with EGCG in water-dioxane mixtures via a stepwise mixing method aided by vigorous mechanical interference...
November 9, 2017: Pharmaceuticals
https://www.readbyqxmd.com/read/29119790/green-tea-polyphenols-decrease-strecker-aldehydes-and-bind-to-proteins-in-lactose-hydrolyzed-uht-milk
#16
Therese Jansson, Valentin Rauh, Bente P Danielsen, Mahesha M Poojary, Sandra S Waehrens, Wender L P Bredie, John Sørensen, Mikael A Petersen, Colin A Ray, Marianne N Lund
The effect of epigallocatechin gallate enriched green tea extract (GTE) on flavor, Maillard reactions and protein modifications in lactose-hydrolyzed (LH) ultrahigh temperature (UHT) processed milk was examined during storage at 40 °C for up to 42 days. Addition of GTE inhibited the formation of Strecker aldehydes by up to 95% compared to control milk, and the effect was similar when GTE was added either before or after UHT treatment. Release of free amino acids, caused by proteolysis, during storage was also decreased in GTE-added milk either before or after UHT treatment compared to control milk...
November 17, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29119399/green-tea-extract-increases-the-expression-of-genes-responsible-for-regulation-of-calcium-balance-in-rat-slow-twitch-muscles-under-conditions-of-exhausting-exercise
#17
E A Korf, I V Kubasov, M S Vonsky, A V Novozhilov, A L Runov, E V Kurchakova, E V Matrosova, T V Tavrovskaya, N V Goncharov
We studied the role of calcium-regulating structures of slow- (m. soleus, SOL) and fast-twitch (m. extensor digitorum longus, EDL) skeletal muscles of rats during adaptation to exhausting physical activity and the possibility of modulating this adaptation with decaffeinated green tea extract. It was established that EDL adaptation is mainly aimed at Са(2+) elimination from the sarcoplasm by Са-ATPase and its retention in the reticulum by calsequestrin. Administration of green tea extract increased endurance due to involvement of slow-twitch muscles whose adaptation is associated with enhanced expression of all the studied genes responsible for the regulation of Ca(2+) balance...
November 9, 2017: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/29104381/comparison-of-antimicrobial-efficacy-of-green-tea-garlic-with-lime-and-sodium-fluoride-mouth-rinses-against-streptococcus-mutans-lactobacilli-species-and-candida-albicans-in-children-a-randomized-double-blind-controlled-clinical-trial
#18
Ann Thomas, Sneha Thakur, Rishika Habib
Introduction: With greater awareness worldwide, the use of herbs and herbal products has increased to a large extent. Objective: To evaluate and compare the antimicrobial efficacy of green tea, garlic with lime, and 0.05% sodium fluoride (NaF) mouth rinses against Streptococcus mutans, Lactobacilli species, and Candida albicans. Materials and methods: A total of 45 children aged 4 to 6 years with severe early childhood caries (S-ECC; based on decayed extracted filled [defs] score) were selected...
July 2017: International Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/29103160/long-term-intake-of-green-tea-extract-causes-mal-conformation-of-trabecular-bone-microarchitecture-in-growing-rats
#19
Akira Minematsu, Yasue Nishii, Hidetaka Imagita, Susumu Sakata
The purpose of this study was to examine the effects of green tea extract (GTE) intake on bone structural and physiological properties, such as bone mass, trabecular bone microarchitecture, cortical bone geometry, and bone mechanical strength, in growing rats. Four-week-old male Wistar rats were divided into the following four groups: standard diet feeding for 85 days (S-CON) or 170 days (L-CON), and GTE diet feeding for 85 days (S-GTE) or 170 days (L-GTE). At the end of the experiment, in addition to measurement of circulating bone formation/resorption markers, bone mass, trabecular bone microarchitecture, and cortical bone geometry were analyzed in the left femur, and bone mechanical strength of the right femur was measured...
November 4, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/29081458/determination-of-formetanate-hydrochloride-in-agricultural-products-by-lc-ms-ms
#20
Maki Kobayashi, Naoko Sakai, Kyoko Kamijo, Hiroshi Koike, Satoru Nemoto, Tetsuya Shindo
An analytical method based on LC-MS/MS was developed for the determination of formetanate hydrochloride in agricultural products. Formetanate hydrochloride was confirmed to be stable in acetonitrile. It was therefore extracted from samples with acetonitrile, and the crude extracts were purified using a combination of ethylenediamine-N-propyl silylation silica gel and graphite carbon mini columns. Formetanate hydrochloride in the resulting sample solutions was quantified by LC-MS/MS utilizing an external solvent calibration curve...
2017: Shokuhin Eiseigaku Zasshi. Journal of the Food Hygienic Society of Japan
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