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 研究細梗香草皂苷B(capilliposide B,LC-B)和細梗香草皂苷C(capilliposide C,LC-C)在不同溫度,pH條件下水解動力學,及水解產(chǎn)物的鑒定.方法 采用高效液相色譜法測定LC-B,LC-C含量,推導出LC-B,LC-C水解過程,恒溫30,50和70°C,pH分別為9.0,10.0,11.0的條件下,不同時間點分別取樣檢測LC-C和LC-B的含量,探討其穩(wěn)定性,并通過質(zhì)譜、核磁共振譜鑒定水解產(chǎn)物.結(jié)果 LC-B,LC-C在不同溫度,pH條件下的水解反應均符合一級動力學.水解速率受水解的溫度和體系pH值的影響:相同的水解溫度,pH越高,水解越快;相同pH,溫度越高水解越迅速.水解產(chǎn)物為細梗香草皂苷A(capilli-poside A,LC-A).結(jié)論 該實驗為LC-A的制備提供一種有效方法.