乙基纤维素膜中壬苯醇醚的释放

目的考察水不溶高分子乙基纤维素薄膜中具有两亲性质的壬苯醇醚的释放行为,考察水微溶阳离子表面活性剂三甲基十六烷基溴化铵的添加对壬苯醇醚释放的影响。方法以刮板法制备5种乙基纤维素载药薄膜,使壬苯醇醚载药量与乙基纤维素质量比为1.5∶10.0、5.0∶10.0、10.0∶10.0、20.0∶10.0、40.0∶10.0,同样以刮板法制备6种添加有三甲基十六烷基溴化铵的薄膜,使壬苯醇醚,三甲基十六烷基溴化铵与乙基纤维素质量比1.5∶0.5∶10.0、1.5∶1.0∶10.0、5.0∶0.5∶10.0、5.0∶1.0∶10.0、10.0∶0.5∶10.0、10.0∶1.0∶10.0。以去离子水为释放介质,37℃,120 r.min-1条件下考察药物的释放,采用HPLC法测定释放介质中药物的量,绘制8 h内的药物累计释放曲线并进行拟合。结果乙基纤维素薄膜中壬苯醇醚载药量的高低,可以使得其8 h内的释放行为从没有释放到30 min内完全突释,2个系列的样品具有缓释能力,并且载药量越大同一时间点乙基纤维素薄膜中壬苯醇醚的释放量越大。添加三甲基十六烷基溴化铵能促进壬苯醇醚的释放。具有缓释行为的样品的释药曲线对Higuchi's和1级释放方程拟合均较好。结论在乙基纤维素薄膜中,壬苯醇醚的载药量可以影响其自身的释放行为,三甲基十六烷基溴化铵的添加和增多可加速壬苯醇醚的释放,为研究其它类型乙基纤维素/壬苯醇醚共混系统药物释放行为提供了参考。

Release behavior of polyethylene glycol mono-4 -nonylphenyl ether from ethyl cellulose films

Objective To investigate release behavior of amphiphilic polyethylene glycol mono-4-nonylphenyl ether from water-insoluable polymer ethyl cellulose,and the effect on release behavior when water semi-soluable cationic surfactant hexadecyltrimethyl ammonium bromide was added.Methods Five kinds of drug-loaded ethyl cellulose film were prepared by casting method with mass ratio of polyethylene glycol mono-4-nonylphenyl ether/ethyl cellulose at 1.5∶ 10.0,5.0∶ 10.0,10.0∶ 10.0,20.0∶ 10.0,40.0∶ 10.0,respectively.Another 3 kinds film with hexadecyltrimethyl ammonium bromide were prepared wiht the ratio of polyethylene glycol mono-4-nonylphenyl ether/hexadecyltrimethyl ammonium bromide /ethyl cellulose at 1.5∶ 0.5∶ 10.0,1.5∶ 1.0∶ 10.0,5.0∶ 0.5∶ 10.0,5.0∶ 1.0∶ 10.0,10.0∶ 0.5∶ 10.0,10.0∶ 1.0∶ 10.0.Drug release test was carried out at 37 ℃,120 r · min-1 in deionized water,release amount was determined by HPLC before accumulative release profiles were prepared and regressed within 8 h.Results Loading amount of polyethylene glycol mono-4-nonylphenyl ether in ethyl cellulose film could lead no drug release within 8h or total burst release after 30 min,2 series of films had the ability of sustained release and as the loading amount of drug lifted,drug release amount became bigger at the same sampling time.Addition of trimethylhexadecyl ammonium bromide favored the release of the drug.Drug release profiles of films which release drug sustainably fitted the regress of Higuchi′s equation and 1st order release equation well.Conclusions Loading amount of polyethylene glycol mono-4-nonyl phenyl ether in ethyl cellulose can affect the release behavior of itself and addition of trimethylhexadecyl ammonium bromide can accelerate the release of the drug.This research provides some references of release behavior for other polyethylene glycol mono-4-nonylphenyl ether/ethyl cellulose hybrid systems.