期刊
JOURNAL OF PHARMACEUTICAL SCIENCES
卷 92, 期 8, 页码 1582-1591出版社
JOHN WILEY & SONS INC
DOI: 10.1002/jps.10414
关键词
r-met-HuGdNF; PLGA microspheres; spontaneous emulsification; burst effect; proteins
资金
- NIGMS NIH HHS [GM26698] Funding Source: Medline
A central issue in controlled delivery of therapeutics from biodegradable microspheres is the immediate burst of drug release upon injection. This burst is often observed with microsphere systems made by the double emulsion (w/o/w) technique, and may be prevented by improving the drug distribution throughout the polymer matrix. To this end, protein and polymer (poly-lactide-co-glycolide or PLGA) were dissolved within the same solvent system, and micron-sized microspheres were created from this solution by spontaneous emulsification. Improved protein loading was achieved by ion-pairing the protein with charged surfactants to increase solubility in the single-phase solvent system. Both in vitro and in vivo results showed a much diminished burst: compared to microspheres made by double emulsion, it was reduced over 10-fold. (C) 2003 Wiley-Liss, Inc. and the American Pharmacists Association.
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