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Showing 1 to 17 of 17 for “"Catechins"”.
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Effects of water chemistry and panning on flavor volatiles and catechins in teas (Camellia sinensis)
In the first experiment, effects of brewing time, chlorine, chloramine, iron, copper, pH and water hardness were investigated for their effects on extraction of epigallocatechine gallate (EGCG) and caffeine in green tea and oolong tea aqueous infusions. The extraction of EGCG and caffeine were …
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A Molecular Dynamics Study on the Interaction of Tea Catechins and Theaflavins with Biological Membranes
… performed to study the interactions of bioactive catechins and theaflavins commonly found in tea with lipid bilayers, as a model for cell membranes. Previously, multiple experimental studies rationalized the anticarcinogenic, antibacterial, and other beneficial effects of these compounds in terms …
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Modulating Bone morphogenetic protein (BMP) and Transforming growth factor-beta (TGF-β) signalling with green tea catechins in mammalian cells
Familial cases of pulmonary arterial hypertension (PAH) are often caused by germline mutations, the most common being a loss of characteristic mutation in the BMPR2 gene, a member of the TGFβ Superfamily. In this study, it was hypothesised that these green tea catechin compounds might inhibit TGFβ …
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Antioxidant activity, protective effects and absorption of polyphenolic compounds
… wine fraction was analysed for total phenolics, catechins and anthocyanins, while antioxidant activity was determined by electron spin resonance spectroscopy (ESR). The preparative HPLC step did into completely separate the compounds in red wine, nonetheless increasing antioxidant activity was …
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A MUSCADINE GRAPE EXTRACT PREVENTS HYPERTENSION-INDUCED CARDIAC AND VASCULAR DAMAGE IN ASSOCIATION WITH ANTI-FIBROTIC AND ANTIOXIDANT MECHANISMS
… including ellagic acid, gallic acid, and catechins. Previous studies demonstrated that muscadine grapes reduce cell proliferation and decrease inflammation. In these studies, we investigated the effects of a muscadine grape extract (MGE) on angiotensin II (Ang II)-induced hypertension and …
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Studies on the interaction of surfactants and neutral cyclodextrins by capillary electrophoresis. Application to chiral analysis
… the thermal epimerisation of epi-structured catechins, (-)-Epicatechin and (-)-Epigallocatechin, to non epi-structured (-)-Catechin and (-)-Gallocatechin. The latter compounds, being non-native molecules, were for the first time regarded as useful phytomarkers of tea sample degradation. The …
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Enzyme structure, function, and evolution in flavonoid biosynthesis
… involved in the biosynthesis of galloylated catechins, a highly enriched class of flavonoids in tea that are thought to have health benefits in humans. These findings contribute to an understanding of the evolution of enzyme structure and function in flavonoid biosynthesis, and how it has …
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Tropical citrus antioxidants and catabolism of phenolics in green tea, coffee, cocoa and orange juice
… and supplementation of green tea and green tea catechins was conducted using GC-MS. Pyrogallol, pyrocatechol, 4-hydroxyphenylacetic acid, (-)5-(3',4'-dihydroxyphenyl)-gamma-valerolactone, (-)-5-(3',4',5'-trihydroxyphenyl)-gamma-valerolactone, 3-(3-hydroxyphenyl)propionic acid and …
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The vasodilatory and antioxidant activities of polyphenolic substances
… of grape and tea based extracts and green tea catechins on vascular tension in vitro, further determine the relationship between their vasodilatory and antioxidant activities and identify the major polyphenols present in green and black tea. Grape and tea based extracts were examined for their …
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Protective Mechanism of Epigallocatechin-3-gallate against Helicobacter pylori- induced Gastric Epithelial Cytotoxicity via Blockage of TLR-4 Signaling
… (EGCG), one of green tea catechins, is known to suppress H. pylori-induced gastritis through its antioxidative and anti-bacterial actions. In this study, we evaluated protective mechanism of EGCG against H. pylori-induced cytotoxicity in gastric epithelial cells. For …
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Rapid analysis of the chemical composition of black tea leaves using vibrational spectroscopy techniques
… production. During this significant stage, the catechins in the tea leaves are converted to theaflavin and the thearubigin compounds and their ratios at the end point of this process plays a major role in the quality of the final product. The implementation of rapid techniques to monitor this …
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Immunohistochemical localisation of caffeine in young tea (Camellia sinensis (L.) O. Kuntze) leaves
… as well as an aid in the sequestration of catechins and polyphenols within the vacuoles of parenchyma cells. Different methods of decaffeination exist using solvents such as methylene chloride, supercritical CO2, and using hot water. Each method has a specific disadvantage. Currently, the …
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Spray Techniques And Lung Cancer Chemoprevention
… E without EGCG, which are mixtures of tea catechins, were studied to investigate the prevention mechanism of the mixture. Resveratrol was delivered in aerosol form to improve its efficacy, because it did not show any inhibitory effects in the dietary form due to its low bioavailability in …
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Effects of green tea catechin extract on serum lipids in postmenopausal women: a randomized, placebo-controlled clinical trial
bold>ABSTRACT</bold> <bold>Objective:</bold> Test the efficacy of a green tea catechin extract (GTE) to improve lipid profile in postmenopausal women. <bold>Methods:</bold> 886 women were enrolled and randomized to consume either 1200 mg of GTE (800 mg EGCG) or placebo, daily. Fasting serum samples …
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Effetti del chitosano su composti polifenolici in colture cellulari di vite: aspetti molecolari e metabolici
… brought relevant variations in stilbenes and catechins levels, so that the production of a certain compound (or class of compounds) could be hypothetically promoted by modulating one or more culture parameters. For example the catechin yield could be improved by increasing sucrose content and …
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Colonic metabolism of dietary grape seed extract: Analytical method development, effect on tight-junction proteins, tissue accumulation, and pan-colonic pharmacokinetics
Procyanidins (PCs) have been extensively investigated for their potential health protective activities, but the prospective bioactivities are limited by their poor bioavailability. The majority of the ingested dose remains unabsorbed and reaches the colon where extensive microbial metabolism …