WebThe cis-configuration of the C-3 hydroxyl group and the B-ring of (-)-epigallocatechin was apparently crucial for rapid and selective production of dehydrotheasinensin C. Oxidation of (-)-gallocatechin proceeded in a manner similar to that of (+)-gallocatechin, and produced an enantiomer of the (+)-gallocatechin product. The results suggest ... WebJan 1, 2011 · Treatment of epigallocatechin gallate with copper(II) chloride efficiently afforded an unstable quinone dimer, dehydrotheasinensin A, and subsequent treatment with ascorbic acid stereoselectively yielded theasinensin A. The latter is a dimer with an R-biphenyl bond, one of the major polyphenols found in black tea. ...

Reactive oxygen species scavenging activities and inhibition

WebNov 19, 2009 · Oxidation of EGC proceeds rapidly and, as mentioned above, the major oxidation product is dehydrotheasinensin C while proepitheaflagallin is the minor product. In contrast, oxidation of (+)-GC is slow and the major product is a 2,3-trans analog of proepitheaflagallin . Only a small amount of the dehydrotheasinensin-type product was … WebDec 1, 2015 · Representing the characteristic flavonoids of oolong tea, theasinensins are dimeric flavan-3-ols. Many recent studies have indicated that oolong tea and theasinensins possess several health ... fox news ruth bader ginsburg obituary

by o-phenylenediamine based metabolomics combining …

WebOct 10, 2024 · It was elucidated that the transformation of dehydrotheasinensin A gives theasinensins A and D. Moreover it was implied that this process may be a … WebApr 2, 2024 · EGC may be oxidized into EGC quinones and dimerize to dehydrotheasinensin C (DTS C), which is a desgalloyl form of DTS A (Tanaka et al., 2010). DTS C then decomposes to give theasinensin C … Web20EGCG; C, procyanidin dimer; D, theasinensin A; E, theasinensin B; F, theasinensin C; 21G, dehydrotheasinensin A; H, dehydrotheasinensin B; I, dehydrotheasinensin C … blackweb outlet