machinery extracts - gallic acid

Tannic acid is a specific formation of tannin, a category of polyphenol. Its weak acidity (pKa all 6) is suitable to the numerous phenol groups in the structure. The chemical formula as a service to commercial tannic acid is ordinarily foreordained as C76H52O46, which corresponds with decagalloyl glucose, but in act it is a amalgamating 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 spy start acclimated to to extract the tannic acid. Commercial tannic acid is chiefly extracted from any of the following weed parts: Tara pods (Caesalpinia spinosa), gallnuts from Rhus semialata or Quercus infectoria or Sicilian sumac leaves (Rhus coriaria).

According to the definitions provided in alien references such as international pharmacopoeia, Subsistence Chemicals Codex and FAO-WHO tannic acid paper one tannins sourced from the above-mentioned plants can be considered as tannic acid. Sometimes extracts from chestnut or oak wood are also described as tannic acid but this is an faulty expend of the term. It is a yellow to light brown amorphous powder.

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