论文部分内容阅读
目的研究橙皮苷水溶液在不同的pH、温度、离子强度、初始浓度条件下降解反应的动力学特征。方法采用高效液相色谱法考察不同条件下橙皮苷含量随时间的变化,利用化学反应动力学的方法计算橙皮苷在不同环境下的降解反应动力学参数,预测其半衰期(t0.5)和活化能。结果橙皮苷在不同环境条件下的降解反应均遵循一级动力学规律,在酸性pH环境中最为稳定,碱性条件下较容易降解,pH=10时的半衰期为2.56 h,活化能为24.73 kJ·mol-1,离子强度和初始浓度对其降解影响不大。结论橙皮苷在酸性水溶液中较为稳定,随着pH的增大降解速率逐渐加快,呈现pH和温度依赖型,提示橙皮苷的使用和保存适宜在低温偏酸性条件下,避免碱性环境和高温条件。
Objective To study the kinetics of degradation of hesperidin aqueous solution under different pH, temperature, ionic strength and initial concentration. Methods The changes of hesperidin content under different conditions were studied by HPLC. The kinetic parameters of hesperidin degradation under different environments were calculated by chemical reaction kinetics. The half-life (t0.5) And activation energy. Results The degradation of hesperidin under different environmental conditions followed the first order kinetics and was the most stable in acidic pH environment. The degradation of hesperidin was easier under alkaline conditions. The half-life at pH = 10 was 2.56 h and the activation energy was 24.73 kJ · mol-1, ionic strength and initial concentration had little effect on its degradation. Conclusion Hesperidin is relatively stable in acidic aqueous solution. The degradation rate of Hesperidin gradually increases with the increase of pH, showing the pH and temperature-dependent, suggesting that the use and preservation of hesperidin is suitable under low temperature and acidic conditions, to avoid alkaline environment and High temperature conditions.