期刊
JOURNAL OF CONTROLLED RELEASE
卷 129, 期 3, 页码 223-227出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jconrel.2008.04.008
关键词
microspheres; non-halogenated solvents; poly(dl-lactic-co-glycolic acid); acetone; glycerol
We investigated a new preparation method for microspheres based on an Oil/Water type emulsion solvent evaporation method using non-halogenated solvents. This method is based on phase separation between acetone and aqueous glycerol. For the preparation of microspheres by this method, a solution of poly(DL-lactic-co-glycolic acid) (PLGA) in acetone and aqueous glycerol containing poly(vinyl alcohol) were used as the dispersed and continuous phases in the emulsification process, respectively. Vitamin B-12 was used as the model drug. The formation of PLGA microspheres was observed above 60% glycerol in the continuous phase. The yield and encapsulation efficiency of the PLGA microspheres was about 80%, which was the maximum yield obtained with 70% glycerol. The release of vitamin B12 lasted for three weeks. (C) 2008 Elsevier B.V. All rights reserved.
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