Journal
ARCHIVES OF PHARMACAL RESEARCH
Volume 32, Issue 3, Pages 359-365Publisher
PHARMACEUTICAL SOC KOREA
DOI: 10.1007/s12272-009-1308-9
Keywords
Microparticles; Poly(D,L-lactide-co-glycolide); d-alpha-tocopheryl polyethylene glycol 1000 succinate; Initial burst; Sustained release
Categories
Funding
- Korean Science and Engineering Foundation (ERC) [R11-2002-100-04001-0]
- Dongkook Pharmaceutical Co.
- Chungnam National University
- National Research Foundation of Korea [R11-2002-100-04001-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The objective of this study was to investigate the potential of various formulation strategies to achieve sustained release of the peptide, from injectable poly(D,L-lactide-co-glycolide) (PLGA) and d-alpha-tocopheryl polyethylene glycol 1000 succinate (TPGS) microparticles. The microparticles were prepared by a solvent evaporation method. Peptide loaded PLGA microparticles exhibited a pronounced initial burst release (22.3% in 1 day) and lag phase in phosphate buffer of pH 7.0. In contrast, blending of 5.0% TPGS (8.6% release in 1 day) or 10.0% TPGS (5.5% release in 1 day) in PLGA microparticles reduced initial burst release and the lag-phase time. Incorporation of TPGS in PLGA microparticles further increased drug release, attributable to improved drug encapsulation, increased particle size, and exempt of pores. PLGA+ 10.0% TPGS composite microparticles exhibited the most desirable drug release among all the formulations tested, and demonstrated triphasic release after minimal initial burst.
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