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Factors affecting the degradation and drug‐release mechanism of poly(lactic acid) and poly((lactic acid)‐ co ‐(glycolic acid))

Factors affecting the degradation and drug‐release mechanism of poly(lactic acid) and... This paper reviews the most important factors affecting the degradation and drug‐release rate of bio‐erodible polymers for better control in biomedical applications. There are several factors that influence the overall rate of degradation, in addition to pH and copolymer composition. In general, polymer degradation is accelerated by greater hydrophilicity in the backbone or end groups, lesser crystallinity, lower average molecular weight, and smaller size of the finished device. At the moment, literature reflects contradictions about the role played by chemically reactive additives, crystallinity and degradation path. Factors affecting degradation and drug‐release rate are discussed in their decreasing order of importance, including intrinsic properties of polymers and processing parameters. Copyright © 2004 Society of Chemical Industry http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Polymer International Wiley

Factors affecting the degradation and drug‐release mechanism of poly(lactic acid) and poly((lactic acid)‐ co ‐(glycolic acid))

Polymer International , Volume 54 (1) – Jan 1, 2005

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References (65)

Publisher
Wiley
Copyright
© 2004 Society of Chemical Industry
ISSN
0959-8103
eISSN
1097-0126
DOI
10.1002/pi.1697
Publisher site
See Article on Publisher Site

Abstract

This paper reviews the most important factors affecting the degradation and drug‐release rate of bio‐erodible polymers for better control in biomedical applications. There are several factors that influence the overall rate of degradation, in addition to pH and copolymer composition. In general, polymer degradation is accelerated by greater hydrophilicity in the backbone or end groups, lesser crystallinity, lower average molecular weight, and smaller size of the finished device. At the moment, literature reflects contradictions about the role played by chemically reactive additives, crystallinity and degradation path. Factors affecting degradation and drug‐release rate are discussed in their decreasing order of importance, including intrinsic properties of polymers and processing parameters. Copyright © 2004 Society of Chemical Industry

Journal

Polymer InternationalWiley

Published: Jan 1, 2005

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