胶束电动毛细管电泳分离测定北沙参中5种香豆素类成分

目的:建立同时测定北沙参中补骨脂素、花椒毒素、异茴芹内酯、佛手柑内酯和东莨菪内酯5种香豆素类成分的胶束电动毛细管电泳法。方法:采用未涂层融硅石英毛细管柱(50.2 cm×75μm×40 cm),20 mmol.L-1硼砂溶液-16 mmol.L-1十二烷基硫酸钠(SDS)-15%乙腈(pH9.6)为运行缓冲液,分离电压22 kV,紫外检测波长214 nm。对缓冲液种类、浓度、pH、SDS、乙腈浓度、电压、温度等因素对分离的影响做了系统的考察。结果:补骨脂素、花椒毒素、异茴芹内酯、佛手柑内酯和东莨菪内酯在7 min内全部分离,线性范围分别为9.91～82.6,37.2～162,2.23～18.6,2.73～22.3,2.89～20.1 mg.L-1,平均回收率分别为98.9%,98.4%,101.3%,99.1%,98.0%。结论:该方法为北沙参药材的质量评价提供了新的途径,简便、快速、灵敏、准确。

Determination of five coumarins in Radix Glehniae by micellar electrokinetic capillary chromatography

A micellar electrokinetic capillary chromatography method with ultraviolet detection was developed for the simultaneous determination of psoralen, xanthotoxin, isoimpinellin, bergapten and scopoletin in Radix Glehniae. The separation was performed on an uncoated fused silica capillary column (50.2 cm x 75 microm x 40 cm) with 20 mmol x L(-1) borax solution (pH 9.6) containing 16 mmol x L(-1) sodium dodecylsulfate (SDS) and 15% acetonitrile as running buffer at applied voltage of 22 kV. The detection wavelength was 214 nm. The effects of concentrations of borax solution, sodium dodecylsulfate (SDS), and organic modifier, voltage, temperature on the separation and sensitivity were investigated. The five active constituents were completely separated within 7 min. The linear ranges of psoralen, xanthotoxin, isoimpinellin, bergapten and scopoletin were 9.91-82.6, 37.2-162, 2.23-18.6, 2.73-22.3 and 2.89-20.1 mg x L(-1), respectively. And the average recoveries were 98.9%, 98.4%, 101.3%, 99.1% and 98.0%, respectively. This simple and rapid method provided a new basis for assessment on quality of Radix Glehniae.