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HPLC-FLD法同时测定丁酸氯维地平及其代谢物

HPLC-FLD method for simultaneous measurement of clevidipine butyrate and its metabolites

  • 摘要: 研究丁酸氯维地平脂微球(CDB-LM)注射液在小鼠体内的药代动力学过程,探讨丁酸氯维地平(CDB)在体内的代谢规律。采用HPLC-FLD法同时测定CDB及其代谢物氯维地平酸(MI)在小鼠全血样品中的浓度。色谱柱Waters C18(4.6 mm×150 mm,5 μm);流动相:乙腈-甲醇-磷酸盐缓冲液(2∶1∶2);FLD检测波长:激发波长358 nm,发射波长440 nm。采用DAS 2.0软件分析计算出CDB和MI的药代动力学参数,所得参数采用PASW Statistics 18软件进行统计分析。结果表明,CDB和MI的半衰期分别在4 min和20 min左右。低剂量组和高剂量组的药代动力学参数依次为:CDB的CL为4.21和2.72 L·min-1·kg-1,AUC0-t为3.86和6.43 mg/L·min,MRT0-t为7.09和6.17 min。MI的CL为0.34和0.22 L·min-1·kg-1,AUC0-t为52.23和74.90 mg/L·min,MRT0-t为201.24和217.33 min。采用乙腈沉淀蛋白法处理全血样品,操作简单快速,全血中内源性杂质无干扰,方法准确可靠。体内研究结果表明,建立的HPLC-FLD法简便、灵敏,可同时测定CDB和MI的血药浓度。高、低两剂量组的血药浓度-时间曲线趋势相同,CDB在体内迅速代谢为MI。

     

    Abstract: To evaluate pharmacokinetic and metabolic characteristics of clevidipine butyrate lipid microspheres(CDB-LM)injection in mice, a novel HPLC-FLD method was developed for simultaneous measurement of clevidipine butyrate(CDB)and its metabolites clevidipine acid(MI)in whole blood samples. The chromatographic column was Waters C18(4. 6 mm×150 mm, 5 μm)and the mobile phase is consisted of acetonitrile-methanol-phosphate(2 ∶1 ∶2). The detection wavelength of FLD included excitation wavelength at 358 nm and emission wavelength at 440 nm. The pharmacokinetic parameters of CDB and MI were calculated by using DAS 2. 0. Then obtained parameters were statisticaly analyzed using PASW Statistics 18. The results showed that the half-life of CDB and MI were about 4 min and 20 min, respectively. Pharmacokinetic parameters of the low- and high-dose groups were as follows: CL of CDB were 4. 21 and 2. 72 L ·min-1 ·kg-1; AUC0-t were 3. 86 and 6. 43 mg/L ·min; MRT0-t were 7. 09 and 6. 17 min. CL of MI were 0. 34 and 0. 22 L ·min-1 ·kg-1; AUC0-t were 52. 23 and 74. 90 mg/L ·min; MRT0-t were 201. 24 and 217. 33 min. A method of protein precipitation was established, and acetonitrile was used to deal with whole blood samples. This method was simple, fast, with no interference with endogenous impurities. The results showed that the established HPLC-FLD method was simple and sensitive. It can be used to determine CDB and MI simultaneously. Comparing the low-dose group with the high-dose group, it was found that the plasma concentration-time curve of the two groups revealed the same tendency, which confirms that CDB has a short half-life and that it metabolizes to MI quickly.

     

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