Comparison of Physicochemical, Binding, and Antioxidant Properties of Chitosans Prepared by Different Decoloration Methods = Comparison of Physicochemical, Binding, and Antioxidant Properties of Chitosans Prepared by Different Decoloration Methods

다국어 초록 (Multilingual Abstract)

Selected physicochemical and functional properties of chitosans as affected by three different decoloration methods (by bleaching agent, sun drying, and UV irradiation) were evaluated. A white-colored chitosan with high viscosity (816.8 and 2460.0 mPa s, respectively) could be prepared by sun drying or UV irradiation without using a bleaching agent. Use of a bleaching agent (NaOCl) caused significantly reduced viscosity (8.2 mPa s) of chitosan in addition to the observed undesirable light brown color. However, chitosan decolorized by a bleaching agent exhibited higher water-binding capacity (529%) and DPPH radical scavenging activity (17.02%) than did the sun drying-chitosan (491% and 14.67%, respectively) and UV-chitosan (485% and 13.55%), due mainly to the lower viscosity. No significant differences in fat-binding capacity (303-313%) were observed among three chitosans.