目的：建立灵敏、快速、稳定的测定大鼠血浆中CYP450探针药物／代谢产物，咖啡因／副黄嘌呤、奥美拉唑／5-羟基奥美拉唑、右美沙芬／右啡烷、咪达唑仑／1′-羟基咪达唑仑的 LC-MS ／MS 方法，并用于其在大鼠体内的药代动力学研究。方法100μL 血浆样品加入内标地西泮及乙酸铵溶液，乙酸乙酯进行液液萃取，离心取上清挥干复溶，LC-MS ／MS 检测。选用 Agilent Eclipse Plus-C18色谱柱（50 mm ×2.1 mm，3.5μm），乙腈和0.01％甲酸（1 mmol·L －1甲酸铵）作为流动相，梯度洗脱，流速为0.3 mL·min －1，进样量10μL。采用电喷雾电离源（ESI），扫描方式为多反应正离子监测模式（MRM＋），咖啡因 m／z：195.0／138.1；副黄嘌呤 m／z：181.1／124.1；奥美拉唑 m／z：346.1／198.1；5-羟基奥美拉唑m／z：362.1／214.1；右美沙芬 m／z：272.2／147.1；右啡烷 m／z：258.1／157.1；咪达唑仑 m／z：326.1／291.1；1′-羟基咪达唑仑m／z：342.1／324.1；内标地西泮 m／z：285.1／154.0。结果咖啡因、副黄嘌呤、奥美拉唑、5-羟基奥美拉唑、右美沙芬、右啡烷、咪达唑仑和1′-羟基咪达唑仑的线性范围分别为1.95～2000、0.98～250、0.48～2000、0.98～250、0.98～2000、0.48～125、1.95～2000和1.95～250μg·L －1。RSD ＜15％且无基质效应。结论该方法快速、灵敏、重现性好，可用于血浆中上述探针药物／代谢产物浓度的测定，便于深入进行代谢酶 CYP1 A2、CYP2C19、CYP2D6和 CYP3A4的代谢相关研究。%Aim To develop a sensitive,rapid and ac-curate LC-MS /MS method for the simultaneous deter-mination of cytochrome P450 probe substrates,inclu-ding caffeine and its metabolite paraxanthine for CYP1 A2,omeprazole and its metabolite 5-hydroxyome-prazole for CYP2C1 9,dextromethorphan and its metab-olite dextrorphan for CYP2D6,midazolam and its me-tabolite 1 ′-hydroxymidazolam for CYP3A4.Methods Probe drugs with the IS diazepam were extracted using ethyl acetate.Gradient elution was performed on an Agilent Eclipse Plus-C1 8 column (50 mm ×2.1 mm, 3.5 μm).The mobile phase consisted of 0.01 % for-mic acid(1 mmol·L -1 ammonium formate)and aceto-nitrile.The flow rate was 0.3 mL·min -1 ,and the in-jection volume was 1 0 μL.The analyte was detected u-sing electrospray ionization(ESI)in positive multiple reaction monitoring(MRM+)mode.The reaction se-lected ions were 1 95.0 /1 38.1 m /z for caffeine, 1 81 .1 /1 24.1 m /z for paraxanthine,346.1 /1 98.1 m /z for omeprazole,362.1 /21 4.1 m /z for 5-hydroxyome-prazole, 272.2 /1 47.1 m /z for dextromethorphan, 258.1 /1 57.1 m /z for dextrorphan,326.1 /291 .1 m /z for midazolam,342.1 /324.1 m /z for 1 ′-hydroxymid-azolam and 285.1 /1 54.0 m /z for diazepam as internal standard.Results The linear ranges of caffeine,pa-raxanthine,omeprazole,5-hydroxyomeprazole,dextro-methorphan, dextrophan, midazolam and 1 ′-hydroxymidazolam were 1 .95 ~2 000,0.98 ~250, 0.48 ~2 000,0.98 ~250,0.98 ~2 000,0.48 ~1 25,1 .95 ~2 000 and 1 .95 ~250 μg·L -1 respec-tively.The RSD of all probe drugs was less than 1 5%and matrix effects in plasma on the ionization of probe drugs were negligible.Conclusion This sensitive and rapid LC-MS /MS method is suitable for determination of the drug/metabolite concentrations in plasma,so as to study the metabolism of CYP1 A2, CYP2C1 9, CYP2D6 and CYP3A4 in depth.
展开▼
