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plant extracts - gallic acid


Tannic acid is a determined cast of tannin, a keyboard of polyphenol. Its frangible acidity (pKa approximately 6) is suitable to the numerous phenol groups in the structure. The chemical method in behalf of commercial tannic acid is time after time given as C76H52O46, which corresponds with decagalloyl glucose, but in in reality it is a mixture of polygalloyl glucoses or polygalloyl quinic acid esters with the digit of galloyl moieties per molecule ranging from 2 up to 12 depending on the spy source euphemistic pre-owned to extort the tannic acid. Commercial tannic acid is chiefly extracted from any of the following works parts: Tara pods (Caesalpinia spinosa), gallnuts from Rhus semialata or Quercus infectoria or Sicilian sumac leaves (Rhus coriaria).

According to the definitions provided in apparent references such as cosmopolitan pharmacopoeia, Edibles Chemicals Codex and FAO-WHO tannic acid paper one tannins sourced from the above-mentioned plants can be considered as tannic acid. Every now 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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