Does coffee contain tannic acid?
from what i have read, tannic acid is in coffee, and is potentially harmful to the human body. ANSWER: Tannic acid is common to decomposing oak, maple and mahogany leaves and bark. It is the commercial form of tannin. It is primarily used in the preservation of animal and mainly cow skins. Thus the uses 'tanning', to 'tan' or a 'tanned' hide. See the related link for more details.
Is it possible to use tannic acid in place of gallic acid for calculation of gallic acid equivalents?
Functional groups in tannic acid are the phenolic -OH groups. Tannic acid is a specific commercial 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 A sketch of its formula is found in 'Related links' below this answer.
Tannic acid is a specific commercial form of tannin, a type of polyphenol. Its weak acidity (pKa around 10) 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…
tannic acid, a mildly acidic substance derived from polyphenolic compounds (tannins), can precipitate many organic and inorganic compounds. tannic acid also has antiseptic properties. tannic acid complexes with and precipitates alkaloids such as nicotine, apomorphine, strychnine; and it also precipitates, to a lesser extent, metals like aluminium, lead, mercury, and silver. potassium permanganate is an oxidising agent that can react with weak basic compounds such as alkaloids.