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Determination of equilibrium solubility and n-octanol/water partition
coefficient of pulchinenosiden D by HPLC
RAO Xiao-yong1,2, YIN Shan3, ZHANG Guo-song1,2, LUO Xiao-jian2,3,
JIAN Hui2,3, FENG Yu-lin2,3, YANG Shi-lin1,2*
(1.Beijing University of Traditional Chinese Medicine, Beijing 100102, China;
2.National Pharmaceutical Engineering Center for Solid Preparation in Chinese Herbal Medicine, Nanchang 330006, China;
3.Jiangxi University of Traditional Chinese Medicine, Nanchang 330006, China)
[Abstract] Objective: To determine the equilibrium solubility of pulchinenosiden D in different solvents and its n-octanol/water partition coefficients. Method: Combining shaking flask method and high performance liquid chromatography (HPLC) to detect the n-octanol/water partition coefficients of pulchinenosiden D, the equilibrium solubility of pulchinenosiden D in six organic solvents and different pH buffer solution were determined by HPLC analysis. Result: n-Octanol/water partition coefficients of pulchinenosiden D in different pH were greater than zero, the equilibrium solubility of pulchinenosiden D was increased with increase the pH of the buffer solution. The maximum equilibrium solubility of pulchinenosiden D was 255.89 g·L-1 in methanol, and minimum equilibrium solubility of pulchinenosiden D was 0.20 g·L-1 in acetonitrile. Conclusion: Under gastrointestinal physiological conditions, pulchinenosiden D exists in molecular state and it has good absorption but poor water-solubility, so increasing the dissolution rate of pulchinenosiden D may enhance its bioavailability.
[Key words] HPLC; pulchinenosiden D; equilibrium solubility; n-octanol/water partition coefficien
doi:10.4268/cjcmm20140910