Preparation of VEGF-loaded PLGA fluorescent sub-micrometer spheres and in vitro controlled release characteristics / 重庆医学

ABSTRACT

Objective To prepare the biodegradable polylactic acid glycolic acid (PLGA) copolymer.encapsulated vascular endothelial growth factor(VEGF) loaded fluorescent controlled release sub-microspheres,to understand the efficiency of microspheres loading and releasing VEGF and to observe in vitro microspheres degradation.Methods VEGF-loading PLGA sub-microspheres were prepared by the two-phase solvent evaporation method,the in vitro degradation of fluorescent microspheres was observed by the laser confocal scanning electron microscopy.The drug loading efficiency and drug release curve were observed by ELISA.Results The VEGF loading PLGA fluorescent microspheres were successfully prepared by using the two-phase solvent evaporation method.The microspheres morphology was normal by using the scanning electron microscope and laser confocal microscope.The particle size was 0.5-1.0 μm with the laser particle size analyzer.The distribution was homogeneous.The VEGF loading rate and encapsulation rate detected by the quantitative ELISA were 3.91％ and 51.42 ％ respectively.The fluorescent microscope observed their slow degradation.The VEGF gentle release was detected by the quantitative ELISA,which showing linear zero order release trend.Conclusion The drug loading efficiency of VEGF-loading PLGA microspheres with 0.5-1.0 μm diameter is higher with linear zero order release,which can be directly observed by fluorescent light.