Aim In vitro dissolution test and pharmacokinetics in beagle dogs wereconducted to assess the formulation of tretinoin in self-emulsifying systems. Methods Theconcentrations of tretinoin were determined by HPLC. A cro...Aim In vitro dissolution test and pharmacokinetics in beagle dogs wereconducted to assess the formulation of tretinoin in self-emulsifying systems. Methods Theconcentrations of tretinoin were determined by HPLC. A crossover study was performed in four fastingbeagle dogs with the formulation of self-emulsifying systems and commercial capsules. Results Theresults showed that the dissolution rate in 15 min of tretinoin in self-emulsifying systems washigher than 80% while that of the commercial capsules was lower than 5% . The area under the plasmaconcentration-time curve (AUC) of the self-emulsifying formulation was significantly higher andC_(max) was approximately two times greater than those of commercial capsule, respectively, Inaddition, the time taken to reach peak was shorter (2 h to 1.25 h) for self-emulsifying formulationof tretinoin. Conclusion The self-emulsifying drug delivery systems.can significantly increasetretinoin in vitro dissolution and in vivo absorption.展开更多
全球大概有40%-70%的新的化学实体由于水溶性差而导致生物利用度低。对于这些化学实体而言,吸收的限速步骤是在胃肠道内的溶出。20世纪70年代,科研工作者们应用自微乳释药系统,以提高难溶性药物的溶出速率和生物利用度。自微乳化...全球大概有40%-70%的新的化学实体由于水溶性差而导致生物利用度低。对于这些化学实体而言,吸收的限速步骤是在胃肠道内的溶出。20世纪70年代,科研工作者们应用自微乳释药系统,以提高难溶性药物的溶出速率和生物利用度。自微乳化药物传递系统(self-microemulsifying drug delivery systems,SMEDDS)是由表面活性剂、油相、助表面活性剂有时还含有促过饱和物质等形成的固体或液体释药体系。展开更多
文摘Aim In vitro dissolution test and pharmacokinetics in beagle dogs wereconducted to assess the formulation of tretinoin in self-emulsifying systems. Methods Theconcentrations of tretinoin were determined by HPLC. A crossover study was performed in four fastingbeagle dogs with the formulation of self-emulsifying systems and commercial capsules. Results Theresults showed that the dissolution rate in 15 min of tretinoin in self-emulsifying systems washigher than 80% while that of the commercial capsules was lower than 5% . The area under the plasmaconcentration-time curve (AUC) of the self-emulsifying formulation was significantly higher andC_(max) was approximately two times greater than those of commercial capsule, respectively, Inaddition, the time taken to reach peak was shorter (2 h to 1.25 h) for self-emulsifying formulationof tretinoin. Conclusion The self-emulsifying drug delivery systems.can significantly increasetretinoin in vitro dissolution and in vivo absorption.
文摘全球大概有40%-70%的新的化学实体由于水溶性差而导致生物利用度低。对于这些化学实体而言,吸收的限速步骤是在胃肠道内的溶出。20世纪70年代,科研工作者们应用自微乳释药系统,以提高难溶性药物的溶出速率和生物利用度。自微乳化药物传递系统(self-microemulsifying drug delivery systems,SMEDDS)是由表面活性剂、油相、助表面活性剂有时还含有促过饱和物质等形成的固体或液体释药体系。