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Tannic Acid

A specific form of tannin, tannic acid is a weakly acidic polyphenol found in some plants. Its applications include use in the chemical staining of wood and as a mordant, a corrosion inhibitor, and a clarifying agent for wine and beer.

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ALADDIN SCIENTIFIC CORPORATION Tannic acid, 100g

Slight special smell strong astringency dark color in exposed light and air Soluble in water soluble in ethanol acetone and glycerol almost insoluble in ether benzene chloroform and petroleum ether Slight special smell with strong astringency Light yellow amorphous powder or loose glossy scaly or spongy solid most of them decompose into pyrogallic acid and carbon dioxide at 210-215 degC 1G in 0 35ml water and 1ml hot glycerin Odorless flammable When it comes to albumin starch gelatin and many alkaloids and metal salts it will precipitate When it comes to iron salts it will also produce black or precipitate The spontaneous combustion point was 526 6 degC and the median lethal dose (rabbit oral) was 5 0 g / kg Tannin is not a single compound and its chemical composition is complex Condensed tannin is a kind of flavanol The 2-position of flavanol in the molecule combines with catechol or pyrogallol through carbon carbon bond Hydrolyzable tannin with ester bond in molecule is ga

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2

ALADDIN SCIENTIFIC CORPORATION Tannic acid, 25g

Slightly special smell strong astringency exposure to light and deep color change in the air Soluble in water easily soluble in ethanol acetone and glycerol almost insoluble in ether benzene chloroform and petroleum ether Slightly special smell and strong astringency Pale yellow amorphous powder or loose shiny scaly or spongy solid which is mostly decomposed into pyrogallic acid and carbon dioxide at 210-215degC 1g is dissolved in 0 35ml water and 1ml hot glycerin It is odorless and flammable When exposed to albumin starch gelatin and many alkaloids and metal salts they precipitate and when exposed to iron salts they also produce black or precipitate Autoignition point 526 6degC The median lethal dose (LD) (rabbit oral) was 5 0g/kg Tannin is not a single compound but its chemical composition is complex and can be roughly divided into two types-(1) condensed tannin is flavanol and the 2-position of flavanol in the molecule is combined with catechol or phloroglucinol through carbon

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