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Emulsion electrospinning as a novel process in spinning core-sheath fibers shows a promising potential in drug release control.The volume ratio of water phase to oily phase is one of the critical parameters in forming core-sheath fibers.In this study,water phase was presented by hydrophilic tetracycline hydrochloride and oily phase by hydrophobic poly( ε-caprolactone)( PCL).The effects of volume ratios of water phase to oily phase on fiber morphology and in vitro drug release were investigated.Scanning electron microscopy( SEM), transmission electron microscopy( TEM),and confocal laser scanning microscopy( CLSM) were used to observe the morphology,core-sheath structure of the fibers and drug loading in the fibers,respectively.Samples of three different volume ratios of water phase to oily phase,1 ∶ 25,1 ∶ 15,and 1 ∶ 10,were prepared with the same concentration of drug solution.Experiment results showed that,with an increase in the volume ratios of water phase to oily phase,the fiber diameter increased and diameter distribution scattered.The drug entrapment efficiency of the fibers reduces with the increase in volume ratios,i.e.,from 73.48% in the ratio of 1∶ 25,62.23% in 1 ∶ 15,down to 45.63% in1∶ 10.In vitro release tests showed that a higher volume ratio of water phase to oily phase would lead to a lower release rate resulted from thicker fiber sheath.
Emulsion electrospinning as a novel process in spinning core-sheath fibers shows a promising potential in drug release control. The volume ratio of water phase to oily phase is one of the critical parameters in forming core-sheath fibers. In this study, water phase was presented by hydrophilic tetracycline hydrochloride and oily phase by hydrophobic poly (ε-caprolactone) (PCL). The effects of volume ratios of water phase to oily phase on fiber morphology and in vitro drug release were investigated. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and confocal laser scanning microscopy (CLSM) were used to observe the morphology, core-sheath structure of the fibers and drug loading in the fibers, respectively. Samples of three different volume ratios of water phase to oily phase, 1: 25, 1: 15, and 1: 10, were prepared with the same concentration of drug solution. Experimental results showed that, with an increase in the volume ratios of water phase to oily phase, the f iber diameter increased and diameter distribution scattered. the drug entrapment efficiency of the fibers reduces with the increase in volume ratios, ie, from 73.48% in the ratio of 1:25, 62.23% in 1: 15, down to 45.63% in1: 10 . In vitro release tests showed that a higher volume ratio of water phase to oily phase would lead to a lower release rate resulted resulted from thicker fiber sheath.