对乙酰氨基酚在大鼠体内药动学研究

目的应用反相高效液相色谱法（RP-HPLC）测定大鼠血浆中对乙酰氨基酚浓度,研究单剂量口服不同剂量对乙酰氨基酚片在大鼠体内的药代动力学。方法3组SD大鼠分别按体重单剂量口服对乙酰氨基酚片300 mg/kg、600 mg/kg、1 200 mg/kg后,采用RP-HPLC测定血浆中药物的浓度,绘制血药浓度-时间曲线,计算其药代动力学参数。结果3个剂量组的对乙酰氨基酚药-时曲线均符合口服吸收的一级动力学二室模型,主要药代动力学参数：Tmax分别为（0.78±0.17）h、（1.07±0.12）h、（1.19±0.12）h;Cmax分别为（158.99±26.08）μg/ml、（226.26±20.38）μg/ml、（402.95±86.46）μg/ml;T1/2kα分别为（0.24±0.09）h、（0.39±0.11）h、（0.43±0.14）h;T1/2ke分别为（3.78±0.33）h、（3.66±0.32）h、（4.33±0.47）h;AUC0→24分别为（718.71±143.03）μg·h^-1·ml^-1（1 578.53±246.76）μg·h^-1·ml^-1（3 734.67±665.58）μg·h^-1·ml^-1AUC0→∞分别为（757.16±155.29）μg·h^-1·ml^-1（1 594.61±247.11）μg·h^-1·ml^-1（3 847.99±692.03）μg·h^-1·ml^-1结论所建立RP-HPLC法能够准确地测定对乙酰氨基酚血药浓度,能满足药代动力学的研究需求;低剂量组和中剂量组的药代动力学过程基本相似,但高剂量组则与上述两组则有所不同,这可能与其剂量过高有关。

Study on Pharmacokinetics of Paracetamol in Rats

Objective To apply the reversed-phase high performance liquid chromatography(RP-HPLC)method for determination of plasma drug concentration of paracetamol in rats,to investigate the pharmacokinetics in rats after different doses of a single oral paracetamol tablet.Methods After three groups of rats were given an oral paracetamol tablet in a single oral dose of 300 mg/kg,600 mg/kg,1 200 mg/kg by weight separately,the concentrations of paracetamol in plasma were determined by RP-HPLC,and then the blood concent...