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The thermal depolymerization of chitosan and alkaline deacetylation of chitin were characterized by measurement of viscosity, gel permeation chromatography (GPC), potentiometric titration (PT), and proton nuclear magnetic resonance spectroscopy ( H 1 NMR). The depolymerization rates (DR) measured by kinematic viscosity (KV), apparent viscosity (AV), and GPC (Mw) until 4 h of treatment were DR KV = 21.9 , DR AV = 25.5 , and D R M w = 23.3 % h - 1 and for 5 to 10 h of treatment they decreased slowly to produce of D R KV = 0.545 , D R AV = 0.248 , and DR Mw = 1.11 % h - 1 . The mole fraction of N-acetylglucosamine residues F A of chitosans was not modified after 10 h of thermal treatment at 100°C. The initial F A values of chitosan without any treatment were F APT = 0.21 and F A HNMR 1 = 0.22 and of chitosan treated for 10 h were F APT = 0.27 and F A HNMR 1 = 0.22 . The variables used to characterize the depolymerization process showed a good correlation. Six hours of thermal treatment as sufficient to obtain chitosans with a molar mass 90% smaller than that of the control chitosan without treatment.

Physicochemical Characterization of Thermally Treated Chitosans and Chitosans Obtained by Alkaline Deacetylation