In vivo degradation and elimination of injectable ricinoleic acid-based poly(ester-anhydride)

Boris Vaisman, Diana E. Ickowicz, Ester Abtew, Moran Haim-Zada, Ariella Shikanov, Abraham J. Domb

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


The in vivo degradation and elimination after subcutaneous implantation of injectable p(SA-RA) 3:7 copolymer in rats, followed by characterization of the polymer matrix composition during hydrolysis and erosion, is reported. Major chemical changes were observed during the first few days post implantation, the anhydride bonds hydrolyzed along with about 45% weight loss and a significant decrease in the molecular weight. 1H NMR spectral analysis was used to determine the structures and content of ricinoleic acid containing oligomeric chains present in the degraded polymer. The polymer degrades into ester oligomers of 2-4 ricinoleic acid units which further degrade to ricinoleic acid, a natural fatty acid. The polymer hydrolytic degradation process fit the in vitro degradation process.

Original languageEnglish
Pages (from-to)1465-1473
Number of pages9
Issue number5
StatePublished - 13 May 2013
Externally publishedYes


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