目的：建立简便、快速、灵敏的 LC-MS ／MS 法测定 Bea-gle 犬血浆中手性药物布洛芬浓度的分析方法，进行系统的方法学验证，并用于布洛芬在 Beagle 犬体内的药代动力学研究。方法以酮洛芬为内标，血浆样品经正己烷（含5％异丙醇）液萃取后，以甲醇：1 mmol·L －1甲酸铵（含0.2％甲酸，10％甲醇）（82∶18，V／V）为流动相，采用 Lux 5u Cellu-lose-3（250 mm·4.6 mm，5μm）柱分离，流速为0.8 mL· min －1。通过电喷雾电离源以多反应监测（MRM）方式进行负离子检测，用于定量分析的离子对分别为 m／z 205.2／161.2（布洛芬）和 m／z 253.1／209.2（内标，酮洛芬）。方法验证包括基质效应、提取回收率、线性、定量下限、批内与批间精密度、稳定性、稀释效应等。结果犬血浆中左／右旋布洛芬的线性范围为0.2～50 mg·L －1，最低定量限为0．2 mg ·L －1，批内、批间精密度（RSD）介于1.01％～13.1％之间。Beagle 犬单次口服给予右旋布洛芬后的主要药动学参数Cmax、T1／2、AUC（0-t）分别为：（82.98±14.83）mg · L －1、（3.217±0.7298）h、（362.0±58.67）h·mg·L －1。单次口服给予消旋布洛芬后，其左／右旋布洛芬的主要药动学参数Cmax、T1／2、AUC（0-t）分别为：（70.62±14.81）／（74.48±20.08） mg·L －1、（1.520±0.9286）／（5.432±1.234）h、（177.8±34.18）／（649.6±200.2）h·mg·L －1。结论该方法简便、快速、灵敏度高、重复性好，能够同时测量血浆中左／右旋布洛芬的药物浓度，可用于布洛芬在 Beagle 犬体内的药代动力学研究。%Aim To develop a simple,rapid and ac-curate analysis method for determination of chiral ibu-profen in Beagle dog plasma.Method The plasma sample was submitted to liquid - liquid extraction u-sing hexane /isopropanol (95 ∶5,V/V),with ketopro-fen as the internal standard (IS).The separation was accomplished in a Lux 5u Cellulose-3 (250 mm·4.6 mm,5 μm)column,and the mobile phase consisted of methanol and a mixture of 1 mmol·L -1 ammonium acetate-methanol-formic acid (90 ∶1 0 ∶0.2,V/V/V) with the volume ratio of 82 ∶1 8 at a flow rate of 0.8 mL· min -1 .The mass spectrometer consisted of an ESI interface operating at negative ionization mode and the detection was performed using multiple reaction monitoring at the transitions of m /z 205.2 /1 61 .2 for ibuprofen and m /z 253.1 /209.2 for ketoprofen (IS). Method validation included the evaluation of the matrix effect, extraction recovery, linearity, lower LOQ, within-run and between-run precision,stability and di-lution effect.Results The calibration curve was line-ar across the concentration range of 0.2 ~50 mg·L -1 for each ibuprofen enantiomer with a lower LOQ of 0.2 mg·L -1 .The within-run and between-run precision (RSD%)was in the range 1 .01 % ~1 3.1 % for each ibuprofen.The pharmacokinetic parameters for orally single dose of (S +)and racemic ibuprofen in Beagle dogs were as follows: Cmax , T1 /2 , AUC(0-t) were (82.98 ±1 4.83 )mg·L -1 ,(3.21 7 ±0.7298)h, (362.0 ±58.67)h·mg·L -1 for (S +)ibuprofen and 70.62 /74.48 mg·L -1 ,1 .520 /5.432 h ,1 77.8 /649.6 h·mg·L -1 for (R -)/(S +)ibuprofen,re-spectively.Conclusions A simple,rapid,accurate, high sensitivity and repeatability method has been suc-cessfully developed,which can analyze the concentra-tions of (R -)/(S +)ibuprofen in Beagle dog plasma simultaneously.The method could be applied for the investigation of pharmacokinetics of ibuprofen enanti-omers in Beagle dogs.
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