摘要：
目的 考察微乳液递送吴茱萸碱(evodiamine loaded microemulsion,EDM)体外释放特征及大鼠的在体吸收情况.方法 制备EDM,用透析法研究其在pH 1.2盐酸溶液和pH 6.8磷酸缓冲溶液中的体外释放特征,计算其累积释放率.再用大鼠在体单向肠循环法研究其在十二指肠、空肠、回肠和结肠的吸收情况,以及在胃的吸收情况,计算其在各部位的吸收速率常数(absorption rate constant,Ka)与有效渗透率(effective permeability,Pef).本实验用HPLC法测定吴茱萸碱(evodiamine,ED)的浓度.结果 EDM和ED在pH 1.2盐酸溶液中的累积释放率分别为(64.76±0.73)％、(13.98±0.49)％,EDM的累积释放率为ED的4.63倍;在pH 6.8磷酸缓冲液中的累积释放率分别为(91.72±0.51)％、(18.34±0.20)％,EDM的累积释放率为ED的5.01倍.EDM在胃肠的Ka为ED的3倍以上,Pef为ED的2倍以上.结论 微乳液能使ED的体外释放以及大鼠胃肠吸收均得以改善.%Aim To study the characteristics of in vitro release and in situ absorption of evodiamine load-ed microemulsion (EDM).Methods EDM was pre-pared, its release in pH 1.2 HCl solution and pH 6.8 phosphate buffer solution were studied by dialysis , and the cumulative release rates were calculated .The sin-gle-pass intestinal perfusion was used to study the ab-sorption of EDM in duodenum , jejunum , ileum and co-lon, the absorption in stomach was also studied , and the absorption rate constant ( Ka ) and effective perme-ability (Pef ) of the drug were calculated.The concen-tration of ED was measured by HPLC .Results The cumulative release rate of EDM and ED in pH 1.2 HCl solution was ( 64.76 ±0.73 )％, ( 13.98 ±0.49 )％, respectively , and that of EDM was 4.63 times of ED . In pH 6.8 phosphate buffer solution the cumulative re-lease rate was ( 91.72 ± 0.51 )％, ( 18.34 ± 0.20)％, respectively, which was 5.01 times of ED. The Ka of EDM was more than 3 times of ED, and Pef was more than 2 times of ED .Conclusion Microe-mulsion can improve in vitro release and in situ absorp-tion of ED.
