Next Article in Journal
Next Article in Special Issue
Previous Article in Journal
Previous Article in Special Issue
Polymers 2010, 2(4), 418-439; doi:10.3390/polym2040418
Article

New Biocompatible Polyesters Derived from α-Amino Acids: Hydrolytic Degradation Behavior

* ,
 and
Received: 20 September 2010; in revised form: 2 October 2010 / Accepted: 8 October 2010 / Published: 13 October 2010
(This article belongs to the Special Issue Advanced Polymer Architectures)
Download PDF [809 KB, uploaded 13 October 2010]
Abstract: New polymers were synthesized from α-hydroxy acids derived from the natural amino acids Ile, Leu, Phe, and Val, combined with lactic acid, glycolic acid and 6-hydroxyhexanoic acid by direct condensation. The toxicity was determined and the degradation process of these polyesters was investigated under physiological conditions by analyzing the composition of the degraded polymers and the oligomers cleaved in the buffer medium. The polymers were found to be non toxic to two cell lines. Polymers displayed a biphasic degradation behavior. In most cases, a linear relationship was found between the weight loss constant and the hydrophobicity of the polymers, Log P. Regarding the second stage of weight loss, it is apparent that polymers derived from α-hydroxy(L)isoleucine ((L)HOIle) and α-hydroxy(L)Valine ((L)HOVal) degraded much faster than those derived from α-hydroxy(L)leucine ((L)HOLeu) and α-hydroxy(L)phenylalanine ((L)HOPhe), probably due to different spatial orientation of the side chains. Copolymers of 6-hydroxyhexanoic acid displayed slow degradation rates as expected, whereas the degradation profile of copolymers of lactic acid was similar to the other homopolymers. These new polyesters may serve as potential biocompatible materials for medical applications.
Keywords: α-hydroxy acids; polyesters; toxicity; degradation; drug delivery α-hydroxy acids; polyesters; toxicity; degradation; drug delivery
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Export to BibTeX |
EndNote


MDPI and ACS Style

Cohen-Arazi, N.; Domb, A.J.; Katzhendler, J. New Biocompatible Polyesters Derived from α-Amino Acids: Hydrolytic Degradation Behavior. Polymers 2010, 2, 418-439.

AMA Style

Cohen-Arazi N, Domb AJ, Katzhendler J. New Biocompatible Polyesters Derived from α-Amino Acids: Hydrolytic Degradation Behavior. Polymers. 2010; 2(4):418-439.

Chicago/Turabian Style

Cohen-Arazi, Naomi; Domb, Abraham J.; Katzhendler, Jeoshua. 2010. "New Biocompatible Polyesters Derived from α-Amino Acids: Hydrolytic Degradation Behavior." Polymers 2, no. 4: 418-439.


Polymers EISSN 2073-4360 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert