Tannic Acid

Product name: Tannic acid

Tannic acid is a specific form of tannin, a type of polyphenol. Its weak acidity (pKa around 6) is due to the numerous phenol groups in the structure. The chemical formula for commercial tannic acid is often given as C₇₆H₅₂O₄₆, which corresponds with decagalloyl glucose, but in fact it is a mixture of polygalloyl glucoses or polygalloyl quinic acid esters with the number of galloyl moieties per molecule ranging from 2 up to 12 depending on the plant source used to extract the tannic acid. Commercial tannic acid is usually extracted from any of the following plant parts: Tara pods (Caesalpinia spinosa), gallnuts from Rhus semialata or Quercus infectoria or Sicilian sumac leaves

Chemical name: 1,2,3,4,6-penta-O-{3,4-dihydroxy-5-[(3,4,5-trihydroxybenzoyl)oxy]benzoyl}-D-glucopyranose

Other names: Acidum tannicum,Gallotannic acid,Digallic acid,Gallotannin,Tannimum,Quercitannin,Oak bark tannin,Quercotannic acid,Querci-tannic acid,Querco-tannic acid

Molecular formula: C₇₆H₅₂O₄₆,

Molecular weight: 1701.19

Melting point: decomposes above 200 °C

CAS Number : 1401-55-4

Quality index : The product complies with the national standard GB5308-85.