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Polímeros

versão impressa ISSN 0104-1428versão On-line ISSN 1678-5169

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ABREU, Fernanda R. de  e  CAMPANA-FILHO, Sérgio P.. Preparation and characterization of carboxymethylchitosan. Polímeros [online]. 2005, vol.15, n.2, pp.79-83. ISSN 1678-5169.  http://dx.doi.org/10.1590/S0104-14282005000200004.

Chitosan was reacted with monochloroacetic acid at room temperature for different reaction times (3h, 5h, 7h and 10h) and employing two chitosan/monochloroacetic acid molar ratios (1:4.3 or 1:8.6). The carboxymethylation of chitosan was confirmed by 1H NMR and 13C NMR spectroscopy. The carboxymethylchitosans had average degrees of substitution ranging from 0.52 to 1.44 as determined by potentiometric and conductimetric analysis. The occurrence of N,O-carboxymethylation was also observed in all cases.

Palavras-chave : Chitosan; carboxymethylchitosan; degree of substitution; characterization.

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