Journal
CARBOHYDRATE POLYMERS
Volume 54, Issue 4, Pages 457-463Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2003.05.004
Keywords
chitosan; deacetylation degree; linear potentiometric titration
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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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