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英文名: Tannic acid

CAS: 1401-55-4      分子式: C76H52O46

分子量: 1701.20000

别名:


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描述

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 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 Chemicals 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; 2850 grams dissolves in one litre of water (1.7 moles per liter). While tannic acid is a specific type of tannin (plant polyphenol), the two terms are sometimes (incorrectly) used interchangeably. The long-standing misuse of the terms, and its inclusion in scholarly articles has compounded the confusion. This is particularly widespread in relation to green tea and black tea, both of which contain tannin but not tannic acid. Tannic acid is not an appropriate standard for any type of tannin analysis because of its poorly defined composition.

基本信息
英文名:
Tannic acid
CAS号.:
1401-55-4
别名:
1,2,3,4,6-penta-O-{3,4-dihydroxy-5-[(3,4,5-trihydroxybenzoyl)oxy]benzoyl}-D-glucopyranose; 2,3-dihydroxy-5-({[(2R,3R,4S,5R,6R)-3,4,5,6-tetrakis({3,4-dihydroxy-5-[(3,4,5-trihydroxyphenyl)carbonyloxy]phenyl}carbonyloxy)oxan-2-yl]methoxy}carbonyl)phenyl 3,4,5-trihydroxybenzoate; Acidum tannicum; Gallotannic acid; Digallic acid; Gallotannin; Tannimum; Quercitannin; Oak bark tannin; Quercotannic acid; Querci-tannic acid; Querco-tannic acid; Tannic acid; Gallotannin Tannin; Glycerite;
分子式:
C76H52O46
分子量:
1701.20000
PSA:
777.98000
LogP:
4.83810
物化属性
外观:
Light yellow to tawny solids with a faint odor
密度:
2.12 g/cm3
熔点:
218 °C
沸点:
闪点:
198°C
储存条件:
Low temperature ventilation and drying in warehouse
安全信息
危害声明:
H412
警示性声明:
P273
海关编码:
3201909000
WGK Germany:
2
危险类别码:
R40
安全说明:
S24/25; S36; S26; S36/37/39; S22
危险品标志:
Xi
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