Biodegradable polymer-silica xerogel composite microspheres for controlled release of gentamicin.
Single and double layered composite microspheres were prepared by encapsulating gentamicin-loaded silica xerogels with biodegradable PLGA polymers (poly(DL-lactide-co-glycolide)). The in vitro drug release properties of both the composite microspheres were investigated. The single layered composite microspheres showed a high initial burst, followed by two sustained release stages lasting for approximately 6 weeks. The two sustained release stages of the single layered composite microspheres could be attributed to the swelling and bulk erosion of the polymer encapsulations, respectively. In comparison with the single layered composite microspheres, the double layered composite microspheres realized a much reduced initial burst together with three sustained release stages. The whole release period of the double layered composite microspheres could last more than 9 weeks. These distinct behaviors make the double layered composite microspheres promising as a new drug release material for localized drug delivery applications.
Department of Materials Science and Engineering, NUS, Singapore, 117543. msexuejm@nus.edu.sg
J M
JM
Xue
C H
CH
Tan
D
D
Lukito
D001672:Biocompatible Materials / Q000737:chemistry*; D001673:Biodegradation, Environmental; D003692:Delayed-Action Preparations / Q000737:chemistry; D004355:Drug Stability; D005782:Gels / Q000737:chemistry; D005839:Gentamicins / Q000737:chemistry*; D019344:Lactic Acid; D008863:Microspheres; D011100:Polyglycolic Acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers; D012822:Silicon Dioxide / Q000737:chemistry*
D001672:Biocompatible Materials; D003692:Delayed-Action Preparations; D005782:Gels; D005839:Gentamicins; D011108:Polymers; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D012822:Silicon Dioxide