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脱乙酰甲壳质是甲壳质衍生物中最重要,用途最为广泛的一种,属阳离子性聚电解质,可以溶于多种酶溶液中。本文从脱乙酰甲壳质在甲酸、乙酸和丁酸溶液中粘度的变化,研究其稀溶液性质。分别考察了脱乙酰甲壳质浓度在8×10~(-2)g/dl-3×10~(-3)g/dl,酸浓度在5×10~(-1)M-1×10~(-2)M范围内溶液ηsp/c-C的关系。实验结果表明,作为脱乙酰甲壳质溶剂的酸,在溶液稀释时对溶液ηsp/c的影响,在不同的阶段可以是完全不同的,当溶液中可离解的酸还未能完全满足游离氨基成盐要求时,酸的增加将导致溶液的ηsp/c的增加,而一旦游离氨基都已成盐,过量酸的增加都会导致溶液粘度的下降。而在一般情况下,酸的酸性越强,酸的浓度越大,都会使溶液得到较低的粘度值。
Chitosan is the most important chitin derivatives, the most widely used one, is a cationic polyelectrolyte, soluble in a variety of enzyme solution. In this paper, the change of viscosity of chitosan in formic acid, acetic acid and butyric acid solution was studied in order to study its dilute solution properties. The chitosan concentration of 8 × 10 -2 g / dl-3 × 10 -3 g / dl and acid concentration of 5 × 10 -1 M -1 × 10 ~ (-2) M solution within the range of ηsp / cC relationship. The experimental results show that as the acid of chitosan solvent, the effect on the solution ηsp / c when the solution is diluted can be completely different at different stages. When the dissociable acid in the solution has not fully satisfied the free amino group When the salt is required, an increase in acid will result in an increase in the ηsp / c of the solution, and an increase in excess acid will cause a decrease in solution viscosity once the free amino groups have all been salified. In general, the more acidic the acid, the greater the acid concentration, will result in a lower viscosity solution.