摘要:
OBJECTIVE To explore the hydrolysis kinetics of capilliposide B and capilliposide C under different temperatures and pH values,and identify the hydrolysis products.METHODS The LC-B and LC-C were quantified by HPLC,then the hydrolysis process was deduced.Samples were taken to investigate the stability of LC-C and LC-B at different time points under the conditions of 30,50,70 °C,and pH 8.0,9.0,10.0,11.0,respectively.The hydrolysis products were identified by mass spectrometry and nuclear magnetic resonance spectroscopy.RESULTS The hydrolysis reaction rates of LC-B and LC-C obeyed first-order kinetics under different pH values and temperatures.And they were related to hydrolysis temperature and pH:at the same temperature,the higher the pH,the faster the hydrolysis rate;at the same pH,the higher the temperature,the faster the hydrolysis rate.The hydrolysis product was capilliposide A.CONCLUSION The study provided an effective method for the preparation of LC-A.%目的 研究细梗香草皂苷B(capilliposide B,LC-B)和细梗香草皂苷C(capilliposide C,LC-C)在不同温度,pH条件下水解动力学,及水解产物的鉴定.方法 采用高效液相色谱法测定LC-B,LC-C含量,推导出LC-B,LC-C水解过程,恒温30,50和70°C,pH分别为9.0,10.0,11.0的条件下,不同时间点分别取样检测LC-C和LC-B的含量,探讨其稳定性,并通过质谱、核磁共振谱鉴定水解产物.结果 LC-B,LC-C在不同温度,pH条件下的水解反应均符合一级动力学.水解速率受水解的温度和体系pH值的影响:相同的水解温度,pH越高,水解越快;相同pH,温度越高水解越迅速.水解产物为细梗香草皂苷A(capilli-poside A,LC-A).结论 该实验为LC-A的制备提供一种有效方法.