Influence of KCl Concentration on Chitin Deacetylation in Microwave Field
微波场中KCl浓度对几丁质脱乙酰反应的影响

This paper presents the effect of KCl concentration on chitin deacetylation in the microwave field. The experimental result shows that the reaction was enhanced when salts were introduced into the reaction system. The degree of deacetylation (DD) of chitosan increases with time, but the rate of increase slows down gradually, revealing the characteristics of first order reaction. The molecular weight (MW) of chitosan decreases with time. The DD of chitosan decreases with the increase of the concentration of KCl, but it is higher than that of the control in the concentration range of KCl investigated. When KCl concentration equals 0.05 mol/L, the DD is 79.3%, as compared with that of the control (69.6%). Along with the increase of KCl concentration, the MW of chitosan decreased, but it increased when the concentration was greater than 0.2 mol/L.