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Citation: HAO Ai-You, ZHANG Li-Xin, ZHANG Hai-Guang. Chemical Determination of Average Substitution Degree of Hydroxyethyl-β-Cyclodextrin[J]. Chinese Journal of Applied Chemistry, ;2002, 19(3): 301-303. shu

Chemical Determination of Average Substitution Degree of Hydroxyethyl-β-Cyclodextrin

1.
School of Chemistry & Chemical Engineering, Shandong University, Jinan 250100

Corresponding author: HAO Ai-You,
Received Date: 19 April 2001
Available Online: 5 December 2001
Fund Project: 国家自然科学基金资助课题(29902004) (29902004)

A chemical analytical method for quantitative determination in hydroxyethyl group of hydroxyethyl-U-cyclodextrin is proposed. The method consists of reacting hydroxyethyl-U-cyclodextrin with HI in the presence of catalyst on heating to form the corresponding amounts of ethene and iodoethane. Then react these compounds with bromine to give I 2, which can be easily determined by standard hyposulphite solution. The formulas for calculation of the average substitution degree from titration results are described. The results obtained by this method appeared to be more accurate than those based on ¹H NMR method.
- hydroxyethyl-U-cyclodextrin,
- average substitution degree,
- chemistry titration
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