Controlling degradation of acid-hydrolyzable pluronic hydrogels by physical entrapment of poly(lactic acid-co-glycolic acid) microspheres.
Chemically crosslinked biodegradable hydrogels based on di-acrylated Pluronic F-127 tri-block copolymer were prepared by a photopolymerization method. Poly(lactic acid-co-glycolic acid) (PLGA) microspheres were physically entrapped within the Pluronic hydrogel in order to modulate the local pH environment by acidic degradation by-products of PLGA microspheres. The PLGA microspheres were slowly degraded to create an acidic microenvironment, which facilitated the cleavage of an acid-labile ester-linkage in the biodegradable Pluronic hydrogel network. The presence of PLGA microspheres accelerated the degradation of the Pluronic hydrogel and enhanced the protein release rate when protein was loaded in the hydrogel.SEM image of photo-crosslinked Pluronic hydrogel entrapping PLGA microspheres.
Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea.
Jun Bae
JB
Lee
Ki Woo
KW
Chun
Jun Jin
JJ
Yoon
Tae Gwan
TG
Park
D001672:Biocompatible Materials / Q000737:chemistry*; D001709:Biotechnology; D004337:Drug Carriers / Q000737:chemistry; D016503:Drug Delivery Systems; D006016:Glycolates / Q000737:chemistry; D020100:Hydrogels / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D019344:Lactic Acid / Q000737:chemistry*; D008027:Light; D008855:Microscopy, Electron, Scanning; D008863:Microspheres; D010316:Particle Size; D011100:Polyglycolic Acid / Q000737:chemistry*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors
D001672:Biocompatible Materials; D004337:Drug Carriers; D006016:Glycolates; D020100:Hydrogels; D011108:Polymers; C031149:glycolic acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid