Stabilization of collagen tissues by photocrosslinking

Aditya V. Vashi, Jerome A. Werkmeister, Tony Vuocolo, Christopher M Elvin, John Alan Maurice Ramshaw

Research output: Contribution to journalArticleResearchpeer-review

18 Citations (Scopus)

Abstract

Photocrosslinking, using 2 mM RuII(bpy)3Cl 2 and various concentrations of sodium persulfate with irradiation by blue light, ∼455 nm, has been shown to be a rapid and effective method for crosslinking various tissues: tendon, amnion membrane, pericardium, and heart valve leaflet. The presence of new crosslinking was demonstrated by the increase in the shrinkage temperature of these tissues. In all the cases, increase in the shrinkage temperatures were seen, although at higher sodium persulfate concentrations, for example, 100 mM, both with and without the Ru II(bpy)3Cl2 catalyst, some degradation of the collagenous tissues was found. The effectiveness of this photocrosslinking method when used with tissues was also shown through the increase in the break strength of tissues after crosslinking, and by the reduction of protein that could be extracted by urea. In solution studies, dityrosine has been shown to be formed during photocrosslinking. With tissues, Western blotting showed the presence of new dityrosine crosslinked proteins.

Original languageEnglish
Pages (from-to)2239-2243
Number of pages5
JournalJournal of Biomedical Materials Research - Part A
Volume100 A
Issue number9
DOIs
Publication statusPublished - Sep 2012
Externally publishedYes

Keywords

  • collagen
  • crosslinking
  • dityrosine
  • tensile properties
  • thermal stability

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