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KMID : 0525720090140030155
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Journal of Chitin and Chitosan
2009 Volume.14 No. 3 p.155 ~ p.159
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Influence of Temperature on Ultrasonic Degradation of Chitosan in Acetic Acid Solution
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Na Jae-Sik
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Abstract
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Chitosans of different molecular weight are usually prepared by various hydrolysis methods such as acid hydrolysis, oxidative degradation method, enzyme hydrolysis method, a microbial method, mechanical energy methods. Ultrasonic degradation of the mechanical methods has been proved to be a highly effective method for degrading macromolecules because it reduces their molecular weight simply by splitting the most susceptible chemical bond of the chain. The purpose of this study was to examine the effect of temperature on variation of physicochemical properties of ultrasonicated chitosan in acetic solution, inferred by reduction in solution viscosity, molecular weight and polydispersity. The ultrasonic conditions were studied in parameters of temperature and reaction time with ultrasonic power at 200W. Ultrasonic degradation has been characterized by colloid titration method, ubbelohde viscometer, and gel permeation chromatography. Results show that the intrinsic viscosity and the molecular weight of chitosan in acetic acid solution were decreased by ultrasonic reaction, and chitosan was more easily degraded in lower temperature than in higher temperature. The ultrasonic degradation rate of chitoan can be accelerated at room temperature.
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KEYWORD
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chitosan, ultrasonication, degradation, molecular weight, sonic temperature
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