Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.biomaterials.2013.02.015
Title: Mechanism of drug release from double-walled PDLLA(PLGA) microspheres
Authors: Xu, Q.
Chin, S.E.
Wang, C.-H. 
Pack, D.W.
Keywords: Degradation
Double-walled microspheres
Doxorubicin
Erosion
PDLLA
PLGA
Issue Date: May-2013
Source: Xu, Q., Chin, S.E., Wang, C.-H., Pack, D.W. (2013-05). Mechanism of drug release from double-walled PDLLA(PLGA) microspheres. Biomaterials 34 (15) : 3902-3911. ScholarBank@NUS Repository. https://doi.org/10.1016/j.biomaterials.2013.02.015
Abstract: The drug release and degradation behavior of two double-walled microsphere formulations consisting of a doxorubicin-loaded poly(d,. l-lactic-co-glycolic acid) (PLGA) core (~46 kDa) surrounded by a poly(d,. l-lactic acid) (PDLLA) shell layer (~55 and 116 kDa) were examined. It was postulated that different molecular weights of the shell layer could modulate the erosion of the outer coating and limit the occurrence of water penetration into the inner drug-loaded core on various time scales, and therefore control the drug release from the microspheres. For both microsphere formulations, the drug release profiles were observed to be similar. The degradation of the microspheres was monitored for a period of about nine weeks and analyzed using scanning electron microscopy, laser scanning confocal microscopy, and gel permeation chromatography. Interestingly, both microsphere formulations exhibited occurrence of bulk erosion of PDLLA on a similar time scale despite different PDLLA molecular weights forming the shell layer. The shell layer of the double-walled microspheres served as an effective diffusion barrier during the initial lag phase period and controlled the release rate of the hydrophilic drug independent of the molecular weight of the shell layer. © 2013 Elsevier Ltd.
Source Title: Biomaterials
URI: http://scholarbank.nus.edu.sg/handle/10635/89366
ISSN: 01429612
DOI: 10.1016/j.biomaterials.2013.02.015
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