期刊
CARBOHYDRATE POLYMERS
卷 54, 期 4, 页码 457-463出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2003.05.004
关键词
chitosan; deacetylation degree; linear potentiometric titration
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 H-1-NMR. (C) 2003 Elsevier Ltd. All rights reserved.
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