Tannic acid is a exact cast of tannin, a category of polyphenol. Its frangible acidity (pKa roughly 6) is appropriate to the numerous phenol groups in the structure. The chemical formula as a service to commercial tannic acid is time after time prone 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 number of galloyl moieties per molecule ranging from 2 up to 12 depending on the plant rise acclimated to to excerpt the tannic acid. Commercial tannic acid is normally 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 external references such as cosmopolitan pharmacopoeia, Food Chemicals Codex and FAO-WHO tannic acid paper only 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 work of the term. It is a yellow to taper brown amorphous powder.
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plant extracts - gallic acid
MichaelVip | 16.07.2021
pozvání na stáž aikido
David B. | 31.03.2014
Zdravím hronovské borce a borky. 10-11.května budu mít v Brně stáž. Tímto si Vás dovoluji co nejsrdečněji pozvat.
David
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zbraně
Lukáš | 28.12.2013
Tady jsem kupoval já ten bokken, JO a tanto .... všechno bylo v pohodě a bezproblémové .. dokonce i komunikace s kamenným obchodem kvůli výměně BO za JO byla pohodová, konkrétně s pobočkou v HK.
Re: Re: zbraně
Lukáš | 28.12.2013
Ajo sry :D :D trošku jsme to zvoral :D
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