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Citation: YANG Jing-Zhi, SUN Yan-Hua, WANG Ri-Wei, QU Xiang-Jin, BAI Ji-Gang. Determination of Tannic Acid in Chinese Gall Nut via Oxidation with I₂[J]. Chinese Journal of Applied Chemistry, ;2005, 22(2): 227-229. shu

Determination of Tannic Acid in Chinese Gall Nut via Oxidation with I₂

1.
a College of Life Science, Shandong Agricultural University, Taian 271018;
2.
b College of Chemistry and Material Science, Shandong Agricultural University, Taian 271018

Corresponding author: SUN Yan-Hua,
Received Date: 26 March 2004
Available Online: 12 July 2004

Oxidation reaction of tannic acid by I₂ was used in the determination of tannic acid in Chinese gall nut by ultraviolet spectrophotometry in aqueous ethanol solution, where I₂ exhibits a sensitive absorption at 289 nm. The linear regression equation of the method is A=0.018 61+0.245 3c(mg/L) with a correlation coefficient of 0.999 8. The linear response range is 0.0~2.0 mg/L, the apparent molar absorptivity is 4.14×10⁵ L/(mol·cm) and the recovery is in the range of 97.8%~104.3%. The method has the advantages of simplicity, high sensitivity and rapidity.
- tannic acid,
- Chinese gall nut,
- iodine oxidation,
- ultraviolet spectrophotometry
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Determination of Tannic Acid in Chinese Gall Nut via Oxidation with I2

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Determination of Tannic Acid in Chinese Gall Nut via Oxidation with I₂