Photomediated crosslinking of C6-cinnamate derivatized type I collagen

Chang Ming Dong, Xiaoyi Wu, Jeffrey Caves, Shyam S. Rele, Benjamin S. Thomas, Elliot L. Chaikof

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Synthesis and characterization of cinnamated Type I collagen and its related mechanical properties after photomediated crosslinking were investigated in detail. Using an EDC/NHS conjugation method, collagen was chemically modified to incorporate a photosensitive cinnamate moiety. The cinnamated collagen was fully characterized by 1H NMR, UV-vis, and circular dichroism (CD) spectroscopy, as well as by rheological and mechanical analyses. Cinnamated collagens with varying degrees of derivatization retained collagen triple helical structure. The rheological spectra of collagen solutions demonstrate that the storage modulus decreases with increasing cinnamate content, owing to a decrease in physical crosslinking. The kinetics of the crosslinking process in both hydrated gels and dry films were monitored by UV-vis spectroscopy and confirmed that crosslinking was complete within 60 min of irradiation. The uniaxial stress-strain behavior of crosslinked collagen films, including Young's modulus and ultimate tensile strength, was comparable to values reported for glutaraldehyde-crosslinked monomeric collagen films. These data demonstrate that derivatization of collagen with photosensitive cinnamate moieties provides a facile route for solid-state crosslinking, thereby improving the mechanical properties of collagen and enhancing the potential applicability of collagen-based materials in tissue engineering and drug delivery.

Original languageEnglish (US)
Pages (from-to)4041-4049
Number of pages9
JournalBiomaterials
Volume26
Issue number18
DOIs
StatePublished - Jun 1 2005
Externally publishedYes

Keywords

  • Blood vessel
  • Cinnamate
  • Collagen
  • Crosslinking
  • Photocrosslinkable
  • Photodimerizable

ASJC Scopus subject areas

  • Bioengineering
  • Ceramics and Composites
  • Biophysics
  • Biomaterials
  • Mechanics of Materials

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