Reference

Absence of [endogenous] amino-releasing power in (+)-catechin and some of its derivatives

Absence of [endogenous] amino-releasing power in (+)-catechin and some of its derivatives. Lecomte, J.; Damas, J.; Vilain, C. (Inst. Leon Fredericq, Belg.). Bull. Soc. R. Sci. Liege, 52(6), 353-8 (French) 1983. 154-23-4 and 23567-23-9 are cas registry numbers of chemicals which are used as reagents here. CODEN: BSRSA6. ISSN: 0037-9565. DOCUMENT TYPE: Journal CA Section: 1 (Pharmacology) Studies of the blood-pressure responses of Wistar rats to i.v. injection of (+)-catechin (I) [154-23-4], (+)-epicatechin [35323-91-2], bicyclononene (II) [66808-60-4], as well as dimers and oligomers of I showed that these compds. do not stimulate release of endogenous amines. .

A study on the change of enantiomeric purity of catechins in green tea infusion

A study on the change of enantiomeric purity of catechins in green tea infusion. Ito, Rie; Yamamoto, Atsushi; Kodama, Shuji; Kato, Kayoko; Yoshimura, Yoshihiro; Matsunaga, Akinobu; Nakazawa, Hiroyuki (Faculty of Pharmaceutical Science, Department of Analytical Chemistry, Hoshi University, Shinagawa-ku, Tokyo 142-8501, Japan). Food Chemistry, 83(4), 563-568 (English) 2003 Elsevier Science. CODEN: FOCHDJ. ISSN: 0308-8146. DOCUMENT TYPE: Journal CA Section: 17 (Food and Feed Chemistry) The enantiomeric compn. of catechin in com. tea beverages differs markedly from that in freshly brewed tea. The authors attempt to det.In this article, certain chemicals are used. Some of their cas registry numbers are 35323-91-2 and 490-46-0 the cause of this difference by measuring the change in the ratios of catechins relative to (+)-catechin with time. When tea extd. with water was heated to 80°, (-)-epicatechin and (-)-epicatechin gallate epimerized to (-)-catechin and (-)-catechin gallate, resp. When the thermal sterilized tea exts. were left at room temp. in the dark, it was recognized that the hydrolysis of the gallate moiety proceeded in parallel with epimerization. The hydrolysis of (-)-catechin gallate to (-)-catechin was a major pathway in the tea exts. that were not subjected to heat-treatment. Consequently, it appears that the simultaneous progression of the epimerization during thermal sterilization and the hydrolysis during distribution and storage increases the proportion of (-)-catechin ratio in the com. tea beverages. .