Catechins


Also found in: Dictionary, Thesaurus, Medical.

Catechins

 

phenols of vegetable origin. Characteristic representatives of catechins are the stereoisomers catechin and epicatechin.

Catechins are colorless crystalline substances, often with a bitter, astringent taste. They are easily soluble in water and alcohol. Tannins are formed upon their polymerization. Catechins have been found in a number of edible fruits (apples, peaches, apricots, quinces, plums, and cherries) and berries (strawberries, currants, raspberries, gooseberries, and red bilberries). A large amount is present in the young shoots of the tea plant (as much as 20–25 percent of the dry weight), in catechu acacias, in grapes (primarily in the pits and skin), and in cocoa beans. The compounds are extracted from tea leaves on an industrial scale.

Catechins are highly active biologically. They regulate capillary permeability, increase the elasticity of capillary walls, and promote more efficient use of ascorbic acid by the organism. Therefore, catechins are among the substances that have vita-min-P activity, and they are used in the treatment of diseases connected with functional disorders of the capillaries and of edemas of vascular origin. Tea catechins have antimicrobial properties and are used in the treatment of dysentery. Oxidative conversions of catechins play an important role in food production technology, including the fermentation of tea, wine-making, and the preparation of cocoa.

REFERENCES

Zaprometov, M. N. Biokhimiia katekhinov. Moscow, 1964. Biokhimiia fenol’nykh soedinenii. Edited by G. Harborne. Moscow, 1968. (Translated from English.)

M. N. ZAPROMETOV

References in periodicals archive ?
A 2007 study using human volunteers suggests that green tea catechins can help boost the production of key detoxification enzymes that provide a metabolic defense against toxic substances.
8) In 1996, the first finding that catechins induce apoptosis was made by Hibasami et al.
The use of indigestible markers showed that most of the monomers and dimers of catechins were totally digested at the end of the intestinal tract of chickens.
Green Tea Catechins and Their Oxidative Protection in the Rat Eye," hitp://pubs.
Using a green tea catechin mixture, they conducted a murine model study evaluating the presence and degree of oxidative stress in fibrotic liver tissue, and the effects of this catechin mix upon the progression of liver damage.
Catechins are antioxidants, and they belong to a class of polyphenols called flavanols.
Animal studies have suggested that a mechanism by which tea catechins may reduce lipid levels is via decreased absorption of cholesterol (32,33).
Catechins in green tea in general were high and showed little variation.
Green tea contains the most catechins, followed by oolong and black teas.
Reducing cholesterol because of its main component - catechins.
Invented by ADM scientists, this patent covers plant-derived compositions enriched with at least two phytochemicals (plant-derived chemicals) from a group consisting of isoflavones, lignans, saponins, catechins and phenolic acids.
Chocolate contains four times more catechins than tea, and a 1.