Tannic acid is a polyphenolic compound found in plant tissues such as persimmons, tea, coffee, and pomegranate. These plants have a particularly high tannic acid content in the immature period. The structure of tannic acid is very complex, but it usually produces glucose, gallic acid or other polyphenolic acids after hydrolysis. Tannins are associated with astringency in foods, can form precipitates with proteins, alkaloids, pectins, and form black matter with ferric iron.
Tannin has anti-oxidant effect and is a natural preservative. It can effectively prevent wine from being acidified due to oxidation, so that long-term storage of wine can maintain its best condition. Therefore, tannin is decisive for the ageing ability of red wine. effect. Tannin can also resolve greasy, because the tannin molecule has a negative charge, and the protein molecules in the meat food have a positive charge, and the meat can be softened and softened by chemical reaction.
Tannin can effectively lower blood cholesterol, prevent fat from depositing in the blood vessel wall, maintain or restore the normal resistance of capillaries, enhance the flexibility and elasticity of blood vessels, and prevent and cure arteriosclerosis. Therefore, foods such as wine and tea with high tannin content not only have the effect of preventing cerebrovascular diseases, but also anti-aging, anti-aging, prevention of Alzheimer's disease, cancer, colds and strengthening immunity.
In addition, tannin has astringent effect, which can make the skin's large pores shrink and tighten, reducing wrinkles and giving the skin a delicate appearance. Tannin has the function of absorbing ultraviolet rays, and the absorption rate can reach over 98%; tannin can also inhibit the activity of tyrosinase and catalase, and can reduce the decolorization of melanin. Therefore, tannin is used for cosmetics with sunscreen and whitening. The role of the skin. Not only that, tannins also have the effect of scavenging free radicals, promoting cell metabolism, maintaining skin vitality, etc., which can make skin healthy, shiny and elastic.
Tannic acid is also toxic: oral administration to the gastric mucosa is irritating, can cause nausea and vomiting; for localized damage, such as large area burns or when added to the barium sulphate enema enema, it is easy to absorb poisoning, causing serious toxicity of the liver, even death.
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