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A potential approach for decreasing the burst effect of protein from PLGA microspheres

✍ Scribed by Karen Fu; Roy Harrell; Kim Zinski; Christina Um; Ana Jaklenec; Jan Frazier; Noah Lotan; Paul Burke; Alexander M. Klibanov; Robert Langer

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
162 KB
Volume
92
Category
Article
ISSN
0022-3549

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✦ Synopsis

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.

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