𝔖 Bobbio Scriptorium
✦   LIBER   ✦

The constitution of theaflavin

✍ Scribed by A.G. Brown; C.P. Falshaw; E. Haslam; A. Holmes; W.D. Ollis


Publisher
Elsevier Science
Year
1966
Tongue
French
Weight
417 KB
Volume
7
Category
Article
ISSN
0040-4039

No coin nor oath required. For personal study only.

✦ Synopsis


The recent publication1 describing (a) thedetermination of the molecular weight of thkaflavin acetate, (b) the deuterirrm analysis of theaflavin delaeroacetate, and (c) the interpretation of the NMR spectrum of the theaflavinmethanol solvate, makes it desirable for us to report our evidence regarding the constitution of theaflavin. Our results are in certain respects more extensive and more detailed than those reported by Gianturco ei al. ' and --No.11 HO IV; R=OtI


πŸ“œ SIMILAR VOLUMES


The constitution and configuration of th
✍ D.T. Coxon; A. Holmes; W.D. Ollis; V.C. Vora πŸ“‚ Article πŸ“… 1970 πŸ› Elsevier Science 🌐 French βš– 220 KB

The pigments characteristic of black tea infusions are of two general types' associated with the theaflavin fraction and the thearubigin fraction. The thearubigins have been recognised as polymeric proanthocyanidins . 2 The theaflavin fraction contains a considerable number of compounds which are

1H and 13C NMR assignment of theaflavin,
✍ Adrienne L. Davis; Ya Cai; Alan P. Davies πŸ“‚ Article πŸ“… 1995 πŸ› John Wiley and Sons 🌐 English βš– 356 KB

## Abstract Theaflavin, theaflavin monogallate and theaflavin digallate were isolated from black tea leaves and studied by 1D and 2D NMR techniques, thus allowing unambiguous assignment of the ^1^H and ^13^C resonances of these complexes. Earlier studies have not yielded ^13^C data of equal reliabi

Deuterium labelling of theaflavin
✍ Weimin Peng; Yin-fang Yao πŸ“‚ Article πŸ“… 2009 πŸ› John Wiley and Sons 🌐 French βš– 123 KB

## Abstract An efficient deuterium labelling of theaflavin, aiming at radiolabelling of theaflavin, was accomplished for the first time by using 4‐deuterium‐labelled __epi__‐catechin as the precursor and the resulting D‐labelled theaflavin was fully characterized by ^1^H NMR, ^13^C NMR, IR spectros

The structure of theaflavin, A polypheno
✍ Y. Takino; A. Ferretti; V. Flanagan; M. Gianturco; M. Vogel πŸ“‚ Article πŸ“… 1965 πŸ› Elsevier Science 🌐 French βš– 278 KB

A crystalline orange-red polyphenol, which has been named theaflavin, has been known for some time to be present in black tea.

Chemical studies of the antioxidant mech
✍ Shengmin Sang; Shiying Tian; Jin-woo Jhoo; Hsin Wang; Ruth E Stark; Robert T Ros πŸ“‚ Article πŸ“… 2003 πŸ› Elsevier Science 🌐 French βš– 232 KB

The objective of the current study is to characterize the reaction products of theaflavin 3,3%-digallate, one of the major characteristic polyphenols of black tea, with hydroxyl radicals generated by hydrogen peroxide, with the aim of gaining insights into specific mechanisms of antioxidant reaction