The plasma concentration of omeprazole and metabolites 5′-hydroxy omeprazole, omeprazole sulphone are determinated by HPLC / 中国药理学通报

ABSTRACT

AIM To set up a method which can determining the blood concentration of omeprazole and its metabolite 5′ omeprazole, omerpazole sulphone in order to study its cinical pharmacokinetics. METHODS The blood concentration of omerpazole was determinated by HPLC. RESULTS Calibrated standard curve of omeprazole in blood is Y=-0 004 499+0 001 909X (r =0 9990), the recoveries of three concentrations 50, 500, 2 000 mg?L -1 are 90 36, 109 62, 108 91%, respectively; and the precisions are 9 86,7 86, 15 52% , respectively. Calibrated standard curve of its metabolite 5′ OH omeprazole in plasma is Y=-0 003 659+0 001 328X(r =0 9970), the recoveries of three concentrations 20, 200, 1 000 mg?L -1 are 79 42%, 96 49%, 95 04%, respectively; and the precisions are 8 95%, 4 52%, 9 73%, respectively. Calibrated standard curve of its another metabolite omeprazole sulphone in plasma is Y=0 009 248+0 001 765X (r =0 999 2), the recoveries of three concentrations 20, 200, 1 000 mg?L -1 are 94 44%, 105 59%, 104 26%, respectively; and the precisions are 8 72, 8 58, 9 60%, respectively. After 20 mg omeprazole were administered by a voluteer via oral, C max of 5′ OH omeprazole, omeprazole, and omerpazole sulphone were 14 622 7, 408 433 2, 454 363 7 mg?L -1 . CONCLUSION The method is good enough to study pharmacokinetics of omeprazole.