Institute of Agro-Products Processing Science and Technology, Chinese Academy of Agricultural Sciences, PR China; Key Laboratory of Agro-Products Processing, Ministry of Agriculture, P.O. Box 5109, Beijing 100193, PR China.
Institute of Agro-Products Processing Science and Technology, Chinese Academy of Agricultural Sciences, PR China; Key Laboratory of Agro-Products Processing, Ministry of Agriculture, P.O. Box 5109, Beijing 100193, PR China.
Ultrason Sonochem. 2015 Mar;23:75-80. doi: 10.1016/j.ultsonch.2014.09.008. Epub 2014 Sep 26.
Molecular weight degradation effects of schizophyllan (SPG) under ultrasonic treatments were investigated in this study. The degradation product was treated by alcohol fractional precipitation technology, and the molecular weight and rheological properties of ultrasonic-treated SPG (USPG) fractions were evaluated. Average molecular weight of SPG decreased significantly after ultrasonic treatments, and degradation product had more narrow distribution of molecular weight. The molecular weight degradation kinetics of SPG is adequately described by a second-order reaction. USPG fractions with different molecular weight were obtained by fractional precipitation for final alcohol concentration fractions 0-40%, 40-60% and 60-80%, respectively. USPG fractions had near-Newtonian flow behaviors, and USPG₈₀% exhibited viscous responses over the entire accessible frequency range. Therefore, ultrasonic treatment is a viable modification technology for SPG and other polymer materials with high molecular weight.
本研究考察了超声处理对裂裥菌素（SPG）分子量降解的影响。降解产物采用醇分级沉淀技术处理，并对超声处理 SPG（USPG）级分的分子量和流变性能进行了评估。超声处理后 SPG 的平均分子量显著降低，降解产物的分子量分布更窄。SPG 的分子量降解动力学可以很好地用二级反应来描述。通过分级沉淀获得了最终醇浓度分别为 0-40%、40-60%和 60-80%的 SPG 级分。USPG 级分呈近牛顿流动行为，USPG₈₀%在整个可及频率范围内表现出粘性响应。因此，超声处理是 SPG 及其他高分子量聚合物材料的一种可行的改性技术。
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