Tannic acid is an organic substance with the chemical formula C76H52O46, which is a tannin obtained from gallnut. It is yellow or light brown light non-crystalline powder or scale; odorless, slightly special smell, very astringent taste. It is soluble in water and ethanol, easily soluble in glycerin, and almost insoluble in ether, chloroform or benzene.
Can be used as food antioxidants. It is generally mixed with vitamin E, vitamin C or gallic acid before use.
Tannin is used as a viscosity reducer and fluid loss reducer for water-based drilling fluids and can improve the quality of filter cake. It is also used for tanning raw hides and turning them into leather. Tannin has the activity of reacting with proteins, polysaccharides, alkaloids, microorganisms, enzymes, and metal ions, and has the properties of anti-oxidation, capturing free radicals, antibacterial, and derivatization reactions. It is more and more widely used in food processing, fruit and vegetable processing, storage, cosmetics, medicine and water treatment.
Tannic acid can combine with protein to produce water-insoluble tannin protein, so adding it to shampoo can prevent the dissolution of hair fiber protein and protect the hair, and use it in nail products to increase nail strength. Gallic tannic acid and isogallic tannic acid have a strong free radical scavenging effect, similar to those of gallic acid and catechin compounds, and can be used in skin care products to sunscreen and brighten the skin. Tannic acid has astringent and antibacterial properties. It is clinically used to treat local bleeding, and can be used for toothpaste to protect teeth and prevent gum bleeding.
Mainly used in medicine, ink, printing and dyeing, leather and metallurgy industries and water treatment, tannin has flocculation, deoxidation, scale inhibition and sterilization in the water treatment process. Because there are a large number of hydroxyl groups and carboxyl groups produced after partial hydrolysis in the molecular structure, it forms complexes with calcium and magnesium ions in the water to prevent calcium and magnesium ions in the boiler water from forming scale, and can also reduce the deposition of calcium sulfate in the cooling water , Play a decentralized role. In addition, the cohesive force of tannin can aggregate the sediment into slag, which is discharged out of the boiler and cooling water system through sewage.
It can be used as a clarifying agent for low-alcohol wine and fruit wine. It can also be used as a leather tanning agent.
Tannic acid is used for chromium-free passivation of zinc coatings.
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