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M. Ratajska, M. H. Struszczyk, S. Boryniec, M. G. Peter, F. Loth

The degree of deacetylation of chitosan: optimization of the IR method – RAPID COMMUNICATION

Polimery 1997, No 9, 572

DOI: dx.doi.org/10.14314/polimery.1997.572


The FTIR spectrophotometric determination of the degree of deacetylation (DD) of krill- and shrimp-derived chitosans was optimized with respect to sample type (film or KBr pellet), evaluation procedure (peak height vs. area), measurement and reference absorption bands, etc. (Table 2, Fig. 5). The 13C-NMR method was assumed to be the reference method. Potentiometric titration was found to be equally reliable. Within the DD 70—100% range, the best DD data are obtained with KBr pellet, peak height, 1650 cm-1 and 3400 cm-1 as the measurement and the reference bands, respectively, and with the base line cut off from a single peak.

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