Gentamicin-loaded discs and microspheres and their modifications: characterization and in vitro release
Resource
Journal of Controlled Release 102 (2): 345-359
Journal
Journal of Controlled Release
Journal Volume
102
Journal Issue
2
Pages
345-359
Date Issued
2005
Date
2005
Author(s)
Abstract
Osteomyelitis is an infection of the bone, and successful treatment involves local administration for about 6 weeks. Gentamicin is a very hydrophilic drug and tends to come out into the water phase when microspheres are fabricated using solvent evaporation method. Hence, spray drying is an option, and it was observed that the release rate tends to be fast when the particle size is small and large particles cannot be prepared by spray drying. In an effort to get better encapsulation efficiency and release rate, we have worked on the possibility of compressing the microspheres into discs and modifying the porosity of the discs by using biocompatible materials like polyethylene glycol (PEG) and calcium phosphates and also on the fabrication of double-walled and composite microspheres. In the case of microspheres, two methods of fabrication both based on solvent evaporation method were employed. The two polymers used are poly-l-lactide (PLLA) and copolymers of poly-dl-lactic-co-glycolic acid (PLGA). One method is based on the spreading coefficient theory for the formation of double-walled microspheres by using single solvent, while the other is based on the property of PLLA not being soluble in ethyl acetate (EA). Characterization to check if the microspheres formed are double-walled was performed. The fabrication method where two solvents, dichloromethane (DCM) and ethyl acetate, were used gave double-walled microspheres, while the other where only dichloromethane was used gave composites. The double-walled microspheres were smaller in size compared to the composites, which were in the range of 100-600 μm. This can be attributed to the difference in the fabrication procedure. We were able to achieve better encapsulation efficiencies of more than 50% and slower release rates, which lasted for about 15 days. It was observed that size played a major role in the encapsulation efficiency and release rates. The possibility of achieving better results by studying the effect of concentration of polymer in solvent and the effect of using different polymers was investigated. ? 2004 Elsevier B.V. All rights reserved.
Subjects
Biodegradable; Disc; Double-walled; Gentamicin; Microspheres
Other Subjects
Dichloromethane (DCM); Ethyl acetate (EA); Poly-dl-lactic-co-glycolic acid (PLGA); Poly-l-lactide (PLLA); Biocompatibility; Bone; Calcium compounds; Concentration (process); Copolymers; Diseases; Drying; Encapsulation; Evaporation; Particle size analysis; Patient treatment; Polyethylene glycols; Porosity; Solvents; Spraying; Drug products; acetic acid ethyl ester; dichloromethane; gentamicin; macrogol; microsphere; polylactide; article; drug release; encapsulation; particle size; priority journal; solubility; spray drying; theoretical study; Anti-Bacterial Agents; Chemistry, Pharmaceutical; Drug Compounding; Drug Delivery Systems; Excipients; Gentamicins; Lactic Acid; Methylcellulose; Microspheres; Molecular Weight; Particle Size; Pharmaceutic Aids; Polyethylene Glycols; Polyglycolic Acid; Polymers; Solubility; Surface Properties
Type
journal article
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