盐酸丁丙诺啡凝胶体外透皮渗透实验研究

Experimental study of in vitro buprenorphine hydrochloride transdermal permeation through hairless mouse skin

目的观察透皮促渗剂对盐酸丁丙诺啡凝胶体外透皮特性的影响。方法实验分为无促渗剂组和促渗剂组,其中无促渗剂组又分为含0.5%、1%、2%盐酸丁丙诺啡3组;促渗剂组根据含促渗剂不同又分为氮酮、油酸和混合组,氮酮组再分含1%、2%、4%氮酮3组,油酸组再分含2%、4%、6%油酸3组,混合组含4%油酸+4%氮酮。以无毛小鼠皮肤为渗透屏障,进行体外渗透试验,分析该凝胶稳态透皮速率(Js)和Js提高率。结果无促渗剂3组Js分别为(0.69±0.11)、(0.90±0.14)和(1.18±0.10)μg/cm2·h,Js提高率分别为0.76、1.00和1.31,组间差异不显著(P>0.05);混合组促渗效果最明显,Js为(13.22±1.27)μg/cm2·h,与4%油酸组和4%氮酮组比较,Js提高率为1.8和1.3(P<0.05),与对照组比较,Js提高率为14.6(P<0.01)。结论盐酸丁丙诺啡凝胶具有良好的透皮特性,适当加入促渗剂油酸或氮酮可以显著提高其Js,使其释放近似零级动力学模型。

Objective To investigate the in vitro transdermal permeation of buprenorphine hydrochloride gel through hairless mouse skin and the effect of permeation enhancers on the permeability of this transdermal drug delivery system. Methods Skin samples 1.0 cm in diameter were obtained from hairless mice for subsequent in vitro tests of the permeability of the drug. In permeation enhancer-free group, the permeability of buprenorphine hydrochloride at the concentrations of 0.5%, 1.0% and 2.0% was tested. The permeation enhancer group (all application containing 1% buprenorphine hydrochloride) was further divided into oleic group (including 3 subgroups with 2%, 4%, and 6% oleic), azone group (subdivided into 3 groups with 1%, 2%, and 4% azone) and mixed group (with 4% oleic plus 4% azone). The permeation parameters, namely steady state flux (Js) and Js enhancement ratio were evaluated. Results Js in permeation enhancer-free groups were 0.69±0.11, 0.90±0.14 and 1.18±0.10 μg/cm 2 ·h respectively, which differed only insignificantly (P>0.05). The mixed group showed the maximum permeation, with Js and ER of 13.22±1.27 μg/cm 2 ·h and 14.6 respectively. Conclusion Permeation enhancers significantly increase Js of buprenorphine hydrochloride gel and renders its release kinetics approaching zero-order.