tea polyphenols Is refers to the tea catechins class (flavanols class), flavones and flavonols, anthocyanidin and phenolic acids and depside polyphenol compound complex, their structure, besides phenolic acids and depside both hydrogen has 2 - phenyl benzo pyran (flavane) as the main body of C6 C3 - C6 basic carbon frame, the catechin compounds as the main body of tea polyphenol ingredients, accounts for about 50% ~ 70% of the total tea polyphenols, accounts for 12% ~ 24% of the dry weight of the tea, it is a kind of structure is more complex compounds, including catechins, gallic catechins, gallic catechins gallic acid ester, catechins gallic acid ester, etc. Tea polyphenol content is roughly in tea is green tea than black tea, summer, autumn tea more than tea. The main therapeutic effects of tea polyphenols are:
(1) lower blood lipid, inhibit atherosclerosis. Many studies have shown that drinking tea can reduce blood cholesterol levels, has obvious function of atherosclerosis. This is because the tea polyphenol compounds on the organism's fat metabolism plays an important role, has to inhibit the action of the rise in cholesterol content in serum and liver, can promote the function of the lipid compounds from the eduction in feces, therefore, it not only can prevent atherosclerosis, and the effect of weight loss.
(2) strengthen the capillaries, reduce blood sugar. Tea polyphenols can not only prevent fat caused by microvascular permeability increase, also with the tea alkaloids work together, make the blood vessel walls sagging, effective diameter increases, which is beneficial to human body blood vessels to relax, enhance the toughness of the capillary wall, have the effect of preventing vascular rupture. The experiment shows that catechins can effectively reduce blood sugar, reduce the risk of diabetes.
(3) resistance to radiation. About radiation protection, tea was first reported by the Japanese. They found that after the atomic bomb survivors, often drink tea, showed less radiation sickness. A series of animal test showed that tea polyphenols has evident effect against radiation. Generally think that the radiation effect of tea polyphenols, and tea polyphenols involved in REDOX reaction in the body, protect blood phase, repair the physiological function, inhibit hemorrhage and so on. Another tea polyphenols can reduce DNA damage caused by radiation.
(4) anti aging. Lipid peroxide in the human body is one of the mechanisms of human aging, free radicals and is the main factor of organic peroxide in the body. Tea polyphenols has strong scavenging free radicals, which can have the effect of antioxidant anti aging. Animal test showed that tea polyphenols can inhibit the skin in the mitochondria of lipoxygenase activity and lipid peroxidation.