论文部分内容阅读
以葡聚糖为研究对象,采用高效凝胶渗透色谱(HPGPC)测定不同超声场与不同初始分子量条件下超声降解过程葡聚糖分子量变化,并建立葡聚糖降解反应的动力学方程。结果表明,适当提高超声场功率和对超声降解体系保持低温均能有效地提高超声降解速率;一定范围内,超声场功率和体系温度的变化与葡聚糖降解速率有较好的线性关系。葡聚糖的初始分子量越大,超声降解速率越高,说明超声波对大分子量的葡聚糖降解作用更明显。
Dextran as the research object, the molecular weight changes of dextran during ultrasonic degradation under different ultrasonic fields and different initial molecular weights were determined by HPGPC, and the kinetic equation of dextran degradation reaction was established. The results show that ultrasonic power and temperature can be effectively enhanced by properly increasing the power of ultrasonic field and keeping the temperature at low temperature. Under certain range, the change of ultrasonic field power and system temperature has a good linear relationship with the degradation rate of dextran. The higher the initial molecular weight of dextran, the higher the rate of ultrasonic degradation, indicating that ultrasonic degradation of dextran with greater molecular weight is more pronounced.