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Abstract
Gelatin nanoparticle-poly(lactic-co-glycolic acid) (PLGA) microsphere composites were prepared by encapsulating protein-loaded gelatin nanoparticles in PLGA microspheres. This encapsulation was conducted by using a phase separation method and a solvent extraction method. The average diameter of the gelatin nanoparticle-PLGA microsphere composites is between 160 and 175 μm. Protein loading efficiency is 93.2% for the nanoparticle-microsphere composite prepared by the phase separation method, while it is 31.31% for the composite prepared by the solvent extraction method. Protein release experiments indicate that this new composite system possesses sustained release characteristics. This system also demonstrates the capability of preventing the denaturation of protein drugs.
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