摘要
以β-环糊精为流动相添加剂，采用反相高效液相色谱法于C18反相柱上拆分了羟基积雪草酸及其同分异构体，建立了积雪草样品中羟基积雪草酸含量的测定方法，探讨了β-环糊精浓度、流动相pH对同分异构体分离度的影响。结果表明：当流动相为甲醇-水（体积比为65：35），pH为4时，同分异构体的分离度随着β-环糊精浓度的增加而增大；羟基积雪草酸在0．1～5．0g／L范围内，峰面积与浓度呈线性关系（r^2=0．9989），说明该法适用于羟基积雪草酸的含量检测及有关药品的质量控制。
Centella asiatica （L.） Urban is a tropical medicinal plant with a long history of therapeutic uses. Madecassic acid and terminolic acid, which are a pair of structural isomers, are two constituents of Centella asiatica. A method using reversed-phase high performance liquid chromatography in which β-cyclodextrin （β-CD） was the additive in mobile phase has been developed for separation of the structural isomers and determination of madecassic acid. The two compounds can be isolated with high resolution on a C18 reversed-phase column with the addition of β-CD in the mobile phase. The separation mechanism of the isomers was discussed. It was assumed that the separation of the isomers might have been resulted from different inclusion forces of complexes with β-CD. The effects of β-CD concentration and the pH of mobile phase on resolution were investigated. It was found that the resolution of the isomers increased with the increase of β-CD concentration when the mobile phase consisted of methanol-water （65： 35, v/v） at pH 4. The correlation coefficient （r^2） of the linear calibration curve between peak area and concentration of madecassic acid was 0.998 9 in the range of 0.1 - 5.0 g/L. This method was successfully used to determine the madecassic acid in triterpenic genins of CenteUa asiatica.
出处
《色谱》
CAS
CSCD
北大核心
2007年第3期316-318,共3页
Chinese Journal of Chromatography
基金
国家自然科学基金资助项目(No.20136020)
