OBJECTIVE:To determine the solubility and apparent oil and water partition coefficient(lg P)of saponin H1,and provide reference for dosage form design and druggability research of saponin. METHODS:HPLC-ELSD was conducted to determine the equilibrium solubility of saponin H1 in different organic solvents and pH buffer solutions;shaking flask was applied to determine lg P value of saponin H1. RESULTS:The equilibrium solubility of saponin H1 in water,methanol and ethanol at 25 ℃ was 0.09175 g/L,96.51 g/L and 46.89 g/L,respectively. The solubility increased apparently at high pH within pH range at 7.6-10.0; the lg P value was between 0.695-0.773 in buffers within pH range at 6.0-8.0. CONCLUSIONS:Saponin H1 and the oleanolic acid type saponins belong to low solubility
low transmission components
so it is not suitable for use as a conventional oral formulation is developed.
关键词
败酱皂苷H1高效液相色谱-蒸发光散射检测法平衡溶解度表观油水分配系数
Keywords
Saponin H1HPLC-ELSDEquilibrium solubilityApparent oil and water partition coefficient