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[摘要]
目的研究人参皂苷Rg3与羟丙基-β-环糊精(HP-β-CD)在水溶液中的包合作用、包合比及包合过程中的热力学参数变化。方法采用相溶解度法、薄层色谱法、红外光谱法、核磁共振法测定人参皂苷Rg3与HP-β-CD在水溶液中包合作用、包合比及包合过程中热力学参数变化。结果在水溶液中人参皂苷Rg3与HP-β-CD均可形成1∶1摩尔比可溶性包合物;人参皂苷Rg3的苷元部分可能嵌入HP-β-CD分子的疏水性空穴中,两个葡萄糖裸露在环糊精腔外。对包合物进行了鉴定和确证,表明人参皂苷Rg3与羟丙基-β-环糊精已经形成包合物。人参皂苷Rg3与HP-β-CD在水溶液中的包合过程可自发进行(△G<0),且为放热反应(△H<0),同时也是熵减过程(△S<0)。结论人参皂苷Rg3与HP-β-CD在水溶液中可自发形成1∶1摩尔比可溶性包合物,从而增加溶解度。选择适宜的包合温度将有利于包合作用的进行。
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[Abstract]
Objective<、b> To investigate the inclusion of ginsenoside Rg3 with hydroxylpropyl-β-cyclodextrin (HP-β-CD) in aqueous solutions, inclusion molar ratio of host and guest molecules, and change of thermodynamic parameters during the inclusion process. Methods<、b> The measurements of the inclusion mechanism, inclusion molar of the host and guest molecules, and change of thermodynamic parameters were carried out by the following methods: phase solubility, IR, NMR, and TLC methods, respectively. Results The results indicated that the inclusion compound of ginsenoside Rg3-HP-β-CD was formed. The content analysis of the inclusion compound showed that the inclusion ratio of ginsenoside Rg3-HP-β-CD was 1∶1. The change in the thermodynamic parameters suggested that the inclusion could proceed (△G<0) spontaneously along with the heat release (△H<0) and the entropy decrease (△S<0). Conclusion A molar ratio inclusion complex (1∶1) of ginsenoside Rg3 with HP-β-CD in aqueous solution could be formed spontaneously and, hence the solubility of ginsenoside Rg3 in aqueous solution increased. Appropriate temperature probably favors the progress of inclusion procedure.
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