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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.


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


References in periodicals archive ?
In particular, (-)-epigallocatechin gallate (EGCG) is thought to be one of the most active catechins in lowering plasma lipids (20).
Polyphenols from the catechin family present in tea have been shown to have antioxidant effects as powerful as vitamins C and E.
In this study, therefore, we examined whether green tea catechins affect the pharmacokinetics of nadolol in rats.
Due to its low percentage in natural products such as green tea, it is not economically viable to isolate commercial quantities of catechins from these materials.
a) Consumption of green tea catechins is only effective at reducing blood glucose if caffeine is also present.
Preliminary studies suggest that EGCG and related catechin compounds in green tea may aid in weight management and reduce the risk of certain types of cancer.
The company's gallate catechin extract will be the active ingredient in formulated products supporting weight loss, anti-aging, the lowering of blood cholesterol, the regulation of high blood pressure and controlling diabetes 1 and 2.
Epigallocatechin has been shown to lower cellular cholesterol concentrations in vitro (Bursill 2006) and catechins extracted from green tea have lowered plasma cholesterol levels in vivo (Bursill 2007).
Green tea contains five types of catechins, namely gallocatechin, epicatechin, epigallocatechin, epicatechin gallate and epigallocatechin gallate, but the most potent of the group is the last one, epigallocatechin gallate, often referred to as EGCg, for short.
The reformulated Heart Blend now combines the heart-healthy benefits of apple and pomegranate polyphenols, green tea catechins and resveratrol from grape skin.
The researchers analyzed the amount of catechins in chocolate and tea and found that dark chocolate contained the most.
Merken explains that foods contain more than 50 flavonoids, and they fit into 5 major subclasses: anthocyanidins, catechins, flavanones, flavones, and flavonols (see list).