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首页> 外文期刊>Journal of Applied Polymer Science >Effect of time/temperature treatment parameters on depolymerization of chitosan
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Effect of time/temperature treatment parameters on depolymerization of chitosan

机译：时间/温度处理参数对壳聚糖解聚的影响

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Depolymerization of the biopolymer chitosan by an autoclaving process at 121degreesC and 15 psi was investigated using various treatments. Acetic acid was found to be the most effective solvent in decreasing chitosan viscosity among the six organic acids tested. The rate of viscosity decrease increased with increasing chitosan concentration. The viscosity of 1% chitosan in 1% acetic acid decreased rapidly to 91% of the initial viscosity following the initial 15 min of autoclaving. This decreased gradually to 93% and 94% in 30 and 60 min, respectively, without being adversely affected by the chitosan solution volume. The degree of deacetylation was comparable before and after autoclaving for 60 min. Chitosan at three molecular weights (M-r = 1597, 1110, and 789 kDa) decreased in molecular weight by 46%-51% in the 15-min treatment, 55%-60% in the 30-min treatment, and 60%-62% in the 60-min treatment. The addition of 0.1%-1.0% (v/v) concentrations of hydrogen peroxide to the chitosan solution autoclaved for 15 min decreased viscosity by 94%-98% and molecular weight by 69%-83%. This process is a simple, timesaving, homogeneous depolymerization procedure, and it is possible to prepare partially hydrolyzed chitosan with specified molecular weights by regulating the time of treatment. (C) 2003 Wiley Periodicals, Inc. [References: 28]
机译：使用各种处理方法，研究了在121℃和15 psi下通过高压灭菌法对生物聚合物壳聚糖的解聚。在测试的六种有机酸中，发现乙酸是降低壳聚糖粘度的最有效溶剂。粘度降低的速率随着壳聚糖浓度的增加而增加。在开始高压灭菌15分钟后，在1％乙酸中的1％壳聚糖的粘度迅速降至初始粘度的91％。分别在30和60分钟内逐渐降至93％和94％，而不受壳聚糖溶液体积的不利影响。高压灭菌60分钟前后的脱乙酰度相当。三种分子量（Mr = 1597、1110和789 kDa）的壳聚糖的分子量在15分钟的处理中分别降低了46％-51％，30分钟的处理中分别降低了55％-60％和60％-62在60分钟的治疗中所占的百分比。将0.1％-1.0％（v / v）浓度的过氧化氢添加到高压灭菌15分钟的壳聚糖溶液中，粘度降低94％-98％，分子量降低69％-83％。该方法是一种简单，省时，均匀的解聚步骤，可以通过调节处理时间来制备具有特定分子量的部分水解的壳聚糖。 （C）2003 Wiley Periodicals，Inc. [参考：28]

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