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Introduction of Tannic acid

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Introduction of Tannic acid

Post  gill on Wed Dec 01, 2010 10:27 pm


Tannic acid is a specific commercial form of tannin, a type of polyphenol. Its weak acidity 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 part: 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 international pharmacopoeia, Food Chemical Codex and FAO-WHO tannic acid monograph 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 incorrect use of the term. It is a yellow to light brown amorphous powder which is highly soluble in water; one gram dissolves in 0.35 mL of water.


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Uses of tannic acid

Post  jyoti on Thu Dec 02, 2010 2:01 am

Tannic acid has many uses such as:
in staining of wood
Used as mordant used in the dyeing process such as cotton.
Also used in Food, medicines etc. and in [urlhttp://www.wiziq.com/tutorial/83641-MVQ-ON-GENERAL-ORGANIC-CHEMISTRY]general organic chemistry[/url]

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