摘 要 ：乙酰哈巴苷和哈巴苷是筋骨草提取物中含量最高的2种有效成分.该文建立了LC-MS/MS法,对beagle犬口服筋骨草提取物后乙酰哈巴苷和哈巴苷的药代动力学进行研究.健康雌性Beagle犬口服不同剂量的筋骨草提取物,对不同时间点的乙酰哈巴苷和哈巴苷血药浓度进行测定,采用winnonlin 6.3软件以非房室模型进行拟合.色谱条件:安捷伦ZORBAX XDB-C18柱 (2.1 mm×50 mm,3.5 μm);柱温30 ℃;流动相(A为0.1%甲酸水溶液;B为乙腈)为0~2 min 5% B;2.1~5 min 95% B;5.1~10 min 5% B.流速0.3 mL·min-1.质谱条件:电喷雾离子源;正离子模式;选择离子分别为乙酰哈巴苷(m/z 429.2→369.2)、哈巴苷(m/z 387.2→207.2)和肉桂酸(m/z 149.2→103.1).干燥气流速10 L·min-1;干燥气温度300 ℃;毛细管电压4 000 V.结果表明Beagle犬口服筋骨草提取物后乙酰哈巴苷和哈巴苷存在剂量依赖性,乙酰哈巴苷和哈巴苷的达峰时间分别为1.7,1.57 h左右,远大于大鼠口服筋骨草提取物后的乙酰哈巴苷和哈巴苷的达峰时间,这可能是由于种属差异造成的.
Abstract:8-O-acetylharpagide and harpagide are two kinds of effective component of Ajuga decumbens extract. A sensitive LC-MS/MS method has been established for pharmacokinetics of 8-O-acetylharpagide and harpagide in beagle dog after oral administration of from A. decumbens extract. Female beagle dogs received orally 12.9, 25.7 mg·kg-1p.o. Concentrations of 8-O-acetylharpagide and harpagide in plasma were determined by LC-MS/MS method at different time points and all pharmacokinetic parameters were estimated by non-compartment analysis. The mobile phase consisted of 0.1% formic acid in water (A) and acetonitrile (B), which was run at a flow rate of 0.3 mL·min-1. Chromatographic separation was achieved on an Agilent ZORBAX XDB-C18 column(2.1 mm×50 mm, 3.5 μm) using a gradient elution of 5%B at 0-2 min, 95%B at 2.1-5 min and 5% B at 5.1-10 min. All analytes, including the IS, were monitored under positive ionization conditions and quantified in MRM mode with transitions of m/z 429.2-369.2 for 8-O-acetylharpagide, m/z 387.2-207.2 for harpagide, and m/z 149.2-103.1 for IS. High purity nitrogen was employed as both the nebulizing and drying gas. Other parameters of the mass spectrometer were optimized as follows: drying gas flow 10.0 L·min-1; drying gas temperature 300 ℃; capillary voltage 4 000 V. Results showed that 8-O-acetylharpagide and harpagide showed a dose-dependence profile. Tmax of 8-O-acetylharpagide is 1.7 h, and Tmax of harpagide is 1.57 h, which was higher than Tmax of 8-O-acetylharpagide and harpagide after oral administration of from A. decumbens extract in rats. The different pharmacokinetic parameters may be due to the species differences of rat and beagle dog.