One-step production of protein-loaded PLGA microparticles via spray drying using 3-fluid nozzle

Pharmaceutical Research
Feng WanMingshi Yang

Abstract

The aim of this study was to investigate the potential of using a spray-dryer equipped with a 3-fluid nozzle to microencapsulate protein drugs into polymeric microparticles. Lysozyme and PLGA were used as a model protein and a model polymer, respectively. The effects of process and formulation variables, such as i) the type of organic solvent, ii) the feeding rate ratio of the outer PLGA-containing feed solution to inner lysozyme-containing feed solution, and iii) the mass ratio of PLGA to protein, on the properties (morphology, internal structure, protein surface enrichment and release profiles) of the spray dried microparticles were investigated to understand protein microencapsulation and particle formation mechanisms. The spherical, condensed microparticles were obtained with D50 of 1.07-1.60 μm and Span in the range of 0.82-1.23. The lysozyme surface content decreased upon different organic solvents used as follows: acetonitrile > acetone > dichloromethane. Additionally, the lysozyme surface enrichment decreased slightly when increasing the feeding rate ratio of the outer feed solution to the inner feed solution from 4:1 to 10:1. Furthermore, it was observed that there was a correlation between the degree of burst release ...Continue Reading

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