نتایج جستجو برای: catechin

تعداد نتایج: 3195  

Journal: :Chemical communications 2014
Gen Watanabe Ken Ohmori Keisuke Suzuki

A viable route has been developed for the selective synthesis of the 4→6-linked catechin dimers, scarcely accessible from Nature and/or through synthesis. An acyclic nucleophilic catechin precursor (seco-catechin) was used for the regioselective union with an electrophilic catechin unit, and subsequent pyran cyclization gave the desired 4→6-linked dimers, i.e., procyanidin B6 and catechin-(4α→6...

Journal: :Life sciences 2006
Wen-Bin Wu Han-Sun Chiang Jia-You Fang Shao-Kuan Chen Chieh-Chen Huang Chi-Feng Hung

High levels of (+)-catechin are found in the skin and seed of many fruits such as apples and grapes. Dietary supplementation with (+)-catechin has been demonstrated to protect epidermal cells against damage induced by ultraviolet B (UVB) radiation. However, the underlying mechanisms are not well understood yet. To determine whether (+)-catechin protects keratinocytes from UVB-induced damage, th...

2015
Priyanka Sharma Pradeep K. Goyal

Aim of the study: Green tea catechin possesses antioxidant and free radical scavenging activity which stimulate detoxification system through selective induction or modification of phase I and phase II metabolic enzymes. This study was carried out to assess the antioxidative and antimetalotoxic effect of green tea Catechin against cadmium chloride in mice. Method: Adult Swiss albino mice were i...

Journal: :Enzyme and microbial technology 2011
Hyun-Kug Cho Hee-Hang Kim Dong-Ho Seo Jong-Hyun Jung Ji-Hae Park Nam-In Baek Myo-Jeong Kim Sang-Ho Yoo Jaeho Cha Young-Rok Kim Cheon-Seok Park

Amylosucrase (ASase, EC 2.4.1.4) is a glucosyltransferase that hydrolyzes sucrose into glucose and fructose and produces amylose-like glucan polymers from the released glucose. (+)-Catechin is a plant polyphenolic metabolite having skin-whitening and antioxidant activities. In this study, the ASase gene from Deinococcus geothermalis (dgas) was expressed in Escherichia coli, while the recombinan...

Journal: :Molecules 2009
Kazuomi Sato Masaru Toriyama

The aim of the present work was to clarify the anti-melanogenic mechanism of the catechin group. In this study, we used (-)-epigallocatechin-3-gallate (EGCG), (-)-epigallocatechin (EGC), (-)-catechin (C), and gallic acid (GA). The catechin group inhibited melanin synthesis in B16 melanoma cells. To elucidate the anti-melanogenic mechanism of the catechin group, we performed Western blotting ana...

Journal: :Food chemistry 2015
N P Aditya Sheetal Aditya Hanjoo Yang Hye Won Kim Sung Ook Park Sanghoon Ko

Curcumin and catechin are naturally occurring phytochemicals with extreme sensitivity to oxidation and low bioavailability. We fabricated a water-in-oil-in-water (W/O/W) double emulsion encapsulating hydrophilic catechin and hydrophobic curcumin simultaneously. The co-loaded emulsion was fabricated using a two-step emulsification method, and its physicochemical properties were characterised. Vo...

2008
Hiroshi Isogai Emiko Isogai Koichi Takahashi Yoichi Kurebayashi

We examined the effect of catechin diet on gingivitis in cats. Gingival inflammation, oral malodor, and percentage of Porphyromonas were decreased after feeding of diet with catechin compounds. We suggest that feline gingivitis can be controlled by phytomedical activities of catechin in pet food. Twenty nine cats affected with gingivitis were fed either a catechin diet of 0.8 mg/g or 0.4 mg/g o...

2011
W Jeffrey Hurst Susann H Krake Stephen C Bergmeier Mark J Payne Kenneth B Miller David A Stuart

This paper reports a systematic study of the level of flavan-3-ol monomers during typical processing steps as cacao beans are dried, fermented and roasted and the results of Dutch-processing. Methods have been used that resolve the stereoisomers of epicatechin and catechin. In beans harvested from unripe and ripe cacao pods, we find only (-)-epicatechin and (+)-catechin with (-)-epicatechin bei...

2010
Jarrod L. Pollock Ragan M. Callaway Giles C. Thelen William E. Holben

1. Evaluating variation, or ‘conditionality’, in plant interactions is crucial to understanding their ecological importance and predicting where theymight be at play.Much is known about conditionality for competition, facilitation and herbivory, but not for allelopathy, which likely contributes to the equivocal nature of reports on this topic.Centaurea maculosa (spotted knapweed) is an invasive...

2016
Bin Li Wenbo Zhang Hanjun Ma

Purpose: To investigate the suitability of glucosyl-β-cyclodextrin (G-β-CD) to form inclusion complex with catechin, and characterize the physicochemical properties of the inclusion complex of catechin and G-β-CD. Methods: Catechin and G-β-CD was mixed in water at the same molar ratio, stirred at 20 °C for 48 h and lyophilized to obtain the complex. Its physicochemical properties were investiga...

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