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Fabrication of Eprinomectin-Loaded PLGA Microspheres and their In Vitro Veterinary Release Profiles
Abstract:
To prolong the bioactivity of eprinomectin (EPM), a batch of EPM-loaded PLGA microspheres were fabricated by a solvent evaporation method. The morphology of resultant microspheres was observed with an S-4800-I scanning electron microscope (SEM). The EPM release behaviors were investigated with a dialysis method and fitted with Zero-order, First-order, and Higuchi dynamical models. The optimum formula, CPVA 2.0 w/v%, stirring rate 1, 200 r/min, CPLGA 4.0 wt%, and oil/water ratio 1/250, was obtained from single-factor experiments. SEM images suggested that the resultant microspheres were monodispersed spheres with a few micropores on their surfaces. Furthermore, more pores and hollows were observed in the degraded PLGA matrix. EPM-loaded PLGA microspheres showed the maximum release amount in the mixture of alcohol/PBS (4/6, v/v). The release process lasted for 30 d, which increased the bioactivity and insecticidal efficacy of EPM. Besides, microspheres with the diameter of 50 μm showed a better release behavior than those from 100 μm and 150 μm ones. Therefore, such method had a promising application on sustained release of veterinary medicine.
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807-812
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July 2015
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© 2015 Trans Tech Publications Ltd. All Rights Reserved
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