固相萃取-HPLC法测定儿童血浆中咪达唑仑的浓度

目的:建立测定儿童血浆中咪达唑仑浓度的方法。方法:采用固相萃取-高效液相色谱法分别测定22例ICU机械通气患儿给药24h后血浆中咪达唑仑浓度。色谱柱为Zorbax Eclipse XDB C18,流动相为乙腈—7·56mmol·L-1硫酸铵溶液(梯度洗脱),柱温为25℃,流速为1·0mL·min-1,紫外检测波长为254nm。结果:咪达唑仑检测浓度在0·05～25·00mg·L-1范围内线性关系良好(r=0·9998);平均回收率为99·29%,日内和日间RSD均<4%;分析方法的最小定量限为0·01mg·L-1。结论:本方法灵敏、准确、简单、快速,可用于临床咪达唑仑血药浓度监测。

Determination of Midazolam in Children''''s Plasma by Solid - phase Extraction - HPLC

OBJECTIVE:To develop a method for the determination of midazolam in child plasma.METHODS:Plasma level of midazolam in twenty two ICU children with mechanical ventilation was detected by solid-phase extraction-HPLC after treatment with midazolam for 24h.The separation was performed on Zorbax Eclipse XDB C18 column with acetonitrile — 7.56mmol· L-1 ammonium sulfate(gradient elution) as mobile phase.The flow rate was 1.0mL· min-1,the column temperature was 25℃ and the wavelength of UV detector was 254nm.RESULTS:The calibration curves for midazolam had a good linearity over the range of 0.05～ 25.00mg· L-1(r=0.999 8).The average recovery for midazolam was 99.29%.Both the intra-day RSD and inter-day RSD were less than 4%.The limits of quantitation for midazolam was 0.01mg· L-1.CONCLUS-ION:The method is sensitive,accurate,simple and rapid,and applicable for clinical blood drug level monitoring of midazolam.