Journal
EUROPEAN JOURNAL OF PHARMACEUTICS AND BIOPHARMACEUTICS
Volume 68, Issue 1, Pages 82-89Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ejpb.2007.05.023
Keywords
tissue engineering; scaffolds; protein delivery; growth factors; Supercritical fluid
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Funding
- Engineering and Physical Sciences Research Council [EP/C534247/1] Funding Source: researchfish
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We report the development of three protein loaded polymer blend and composite materials that modify the release kinetics of the protein from poly(DL-lactic acid) (P(DL)LA) scaffolds. P(DL)LA has been combined with either poly(ethylene glycol) (PEG), poly(caprolactone) (PCL) microparticles or calcium alginate fibres using supercritical CO2 (scCO,) processing to form single and dual protein release scaffolds. P(DL)LA was blended with the hydrophilic polymer PEG using scCO(2) to increase the water uptake of the resultant scaffold and modify the release kinetics of an encapsulated protein. This was demonstrated by the more rapid release of the protein when compared to the release rate from P(DL)LA only scaffolds. For the P(DL)LA/alginate scaffolds, the protein loaded alginate fibres were processed into porous protein loaded P(DL)LA scaffolds using scCO(2) to produce dual release kinetics from the scaffolds. Protein release from the hydrophilic alginate fibres was more rapid in the initial stages, complementing the slower release from the slower degrading P(DL)LA scaffolds. In contrast, when protein loaded PCL particles were loaded into P(DL)LA scaffolds, the rate of protein release was retarded from the slow degrading PCL phase. (c) 2007 Elsevier B.V. All rights reserved.
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