在体皮肤微透析的建立及对乌头碱经皮给药药代动力学研究

目的:建立大鼠在体皮肤微透析技术,并用于乌头碱经皮给药药代动力学研究。方法:采用HPLC-MS/MS联用技术建立大鼠血浆和微透析样品中乌头碱的分析方法。体外回收率的测定采用浓差法(增量法、减量法),体内回收率的测定采用减量法,考察流速、浓度对回收率的影响。5只SD大鼠在麻醉状态下,作皮肤微透析预处理后,将乌头碱凝胶涂于探针所在皮肤表面,进行皮肤微透析和颈动脉采血,应用HPLC-MS/MS测定透析液样品及血浆中乌头碱浓度,并绘制血药浓度-时间曲线,并计算药动学参数。结果:乌头碱在检测要求范围内线性关系良好,色谱的专属性、回收率、精密度等测定结果均符合生物样品测定要求。增量法及减量法测定的回收率一致;回收率随灌流速度的增大而减小,探针的回收率与溶媒中乌头碱的浓度无关。体内皮下探针对乌头碱的回收率为(34.48±3.05)%,乌头碱在皮下探针中6 h回收率的变化基本上保持稳定。乌头碱经皮给药后,在皮肤中最大药物浓度为(2723.8±848.8)mg.L-1,AUC(0～t)为(18212.4±4749.1)mg.h.L-1,体内血药浓度比较稳定。结论:本研究提示体内研究的反透析法可作为微透析研究中乌头碱回收率的测定...

A novel skin microdialysis technique in vivo and its application on pharmacokinetics study of aconitine after transdermal administration

Objective:To develop a novel skin microdialysis technology in vivo,and to determine the pharmacokinetic of aconitine after transdermal administration in rats.Methods:An HPLC-MS/MS method used for the determination of aconitine in microdialysis samples and plasma was established.Comparable in vitro recoveries were obtained by different established approaches including recovery estimation by gain and loss method.Recovery by loss was used to study the in vivo recovery of aconitine from rat subcutaneous tissue....