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A new linear potentiometric titration method for the determination of deacetylation degree of chitosan

✍ Scribed by Xuan Jiang; Lirong Chen; Wei Zhong

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
135 KB
Volume
54
Category
Article
ISSN
0144-8617

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✦ Synopsis

The degree of deacetylation (DD) is one of the most important properties of chitosan. Therefore, a simple, rapid and reliable method for the determination of DD of chitosan is essential. In this report, two new potentiometric titration functions are derived for the determination of DD of chitosan. The effects of the precipitation and the errors induced in pH measurement are discussed in detail. To make this method more simple and reliable, two universal pH regions for the accurate plotting of different DD chitosan samples are proposed for the new potentiometric titration functions. The DD values of three chitosan samples obtained with this new method show good agreement with those yielded from elemental analysis and 1 H-NMR.

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