Catechins

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Related to catechin: Epicatechin

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 ?
* This green tea extract boosts total catechin bioavailability up to 12 times.
Catechins are substances naturally present in green tea, the most abundant of which is epigallocatechin gallate (EGCG).
Caption: Figure 2: Changes of catechin components content of fresh leaf cultivars from different varieties, region and seasons during tea processing (mg/g).
(+) Catechin (>97%), poly (D,L-lactic acid) (PLA), polyethylene glycol (PEG), polyvinyl alcohol (PVA), pancreatin 3x, pepsin 1:1000, 3-(2-pyridyl)-5,6-diphenyl-1,2,4-triazine-p,p'-disulfonic acid monosodium salt hydrate (Ferrozine), pyrogallol (for synthesis), 2-thiobarbituric acid, 2,2-diphenyl-1-picrylhydrazyl (DPPH), and amyloid beta protein fragments 1-42 were purchased from Sigma Chemical Co.
In addition, topically applying green tea catechins in the morning in combination with traditional sunscreens is believed to have the potential to protect the skin from UV-induced damage.
Catechin Treatment and Exercise Prevent the Altered Vascular Function with Age.
After 8 weeks of therapy, the xylitol-containing placebo failed to affect saliva output while the green tea catechin containing formula resulted in a statistically significant increase in saliva output with a 3.8-fold increase in unstimulated saliva output and a 2.1-fold increase in stimulated saliva output, compared with baseline.
2 THEY contain catechin, an antioxidant that scavenges the free radicals in the body and can help prevent cancer from forming.
2 Raisins contain catechin, an antioxidant that scavenges the free radicals in the body and can help prevent cancer from forming.