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摘要 建立了一种简易的反相高效液相色谱方法测定沙丁胺醇血药浓度。以含磷酸二(2-乙基己基)酯的氯仿液进行提取,0.1mol/L盐酸反提,内标为丁酚胺。固定相为Spherisorb
C18;流动相为:0.03mol/L磷酸二氢铵(用磷酸调至pH2.6)—甲醇—乙腈(92.2∶3.4∶4.4),流速1.5mL/min。荧光检测器的激发波长为225nm,荧光波长为310nm。在血浆浓度0.5~50ng/mL范围内线性良好。回收率为78.3%~83.6%。日内相对标准偏差为4.5%~6.8%,日间相对标准偏差为7.2%~9.5%。应用本方法测定了8名志愿者口服沙丁胺醇片后的血药浓度。 沙丁胺醇(Salbutamol)为选择性β-受体激动剂,有较强的支气管扩张作用,临床用于治疗支气管哮喘症。该药血药浓度很低,分析方法的灵敏度要求高,报道有气-质联用法[1]和高效液相色谱法[2~9]等。本文报道一种以磷酸二(2-乙基己基)酯加入氯仿进行液—液提取、0.1
mol/L盐酸反提和荧光检测器检测沙丁胺醇血药浓度的简易HPLC,该法具有灵敏度高、方法简便、试剂价廉易得的优点。应用本法测定了8名健康志愿者口服8mg沙丁胺醇片后血药浓度。 |
图1 高效液相色谱图 3.2 标准曲线的制备 于空白血浆中加入沙丁胺醇对照溶液,使其浓度分别为0.5、1、2、5、10、20、30、40、50ng/mL,按上述“样品处理”项处理,进行测定。以沙丁胺醇浓度(C)为横坐标,沙丁胺醇与内标色谱峰高比值(H)为纵坐标作回归计算。结果表明,在0.5~50ng/mL范围内线性良好,回归方程及相关系数分别为: |
图2 8名志愿者单次口服8mg沙丁胺醇片后的药时曲线4 讨论 4.1 提取条件的选择 沙丁胺醇具有两性特征,pKa为9.3和10.3,易溶于水,故多用固相提取[2~6]。因固相提取法成本较高且繁琐,我们尝试了液-液提取法。用有机溶剂如氯仿提取时回收率为零,如用含0.12mol/L
DEHP的氯仿提取,0.1mol/L盐酸反提,可得回收率约80%,这与文献报道[7~9]相似。 参考文献 1 Weisberger M,et al.Quantitative
analysis of albuteral in human plasma by combined gas chromatography
chemical ionization mass spectrometry. Biomed Mass Spectrom,1983,10:556 (本文于1997年3月10日收到) A
Simple and Rapid HPLC Determination of Salbutamol Chen Xiao Zhao Xianglan Abstract:A simple and rapid HPLC method
is presented for the determination of salbutamol in human plasma.Plasma
samples were extracted with chloroform containing di(2-ethylhexyl)phosphate.Samples
were back extracted into a hydrochloric acid solution.This method
involved a C18 column as stationary phase and
0.03mol/L (NH4)H2PO4(pH2.6,adjusted by H3PO4)-methanol-acetonitrile(92.2:3.4:4.4)as mobile phase.A
fluorescence detector was used for this assay.Bamethane was used
as the internal standard.The carlibration curve was linear between
0.5 and 50 ng/mL with a regression coefficient of 0.999. The recoveries
of salbutamol samples were 78.3%~83.6% for plasma. Inter-day and
intra-day RSD were 4.5%~6.8% and 7.2%~9.5% respectively. This method has been used in the bioavailability
study of salbutamol tablets (Ventolin, Glaxo) given to eight healthy
volunteers. |