Photochemical crosslinking improves the physicochemical properties of collagen scaffolds
- 16 August 2005
- journal article
- research article
- Published by Wiley in Journal of Biomedical Materials Research Part A
- Vol. 75A (3), 689-701
- https://doi.org/10.1002/jbm.a.30469
Abstract
Collagen is a natural biomaterial with excellent biocompatibility. However, unprocessed collagen has low stability and weak mechanical strength, which limits its application in tissue engineering. The current study aimed to improve the physicochemical properties of collagen scaffolds by using photochemical crosslinking. Collagen gel was reconstituted and photochemically crosslinked by using laser irradiation in the presence of a photosensitizer. Scanning electron microscope was used to characterize the surface and cross-sectional morphology. Stress-strain relationship and other mechanical properties were determined by uniaxial tensile tests. Thermostability and water-binding capacities also were analyzed by using differential scanning calorimetry and swelling ratio measurements, respectively. Photochemically crosslinked porous structures showed fine microstructure with interconnected micron-sized pores, whereas uncrosslinked controls only showed macrosheet-like structures. The stabilizing effect of photochemical crosslinking also was revealed by retaining the three-dimensional lamellae-like structures after thermal analysis in crosslinked membranes but not in the controls. Photochemical crosslinking also significantly reduced the swelling ratio, improved the stress-strain relationship, peak load, ultimate stress, rupture strain, and tangent modulus of collagen membranes. The current study showed that an innovative photochemical crosslinking process was able to produce collagen scaffolds with fine microstructures; to strengthen, stiffen, and stabilize collagen membranes; and to modify their swelling ratio. This may broaden the use of collagen-based scaffolds in tissue engineering, particularly for weight-bearing tissues. © 2005 Wiley Periodicals, Inc. J Biomed Mater Res, 2005Keywords
This publication has 25 references indexed in Scilit:
- Influence of different collagen species on physico-chemical properties of crosslinked collagen matricesBiomaterials, 2004
- Photochemical effects and hypericin photosensitized processes in collagenJournal of Biomedical Optics, 2001
- Preparation and characterization of porous crosslinked collagenous matrices containing bioavailable chondroitin sulphateBiomaterials, 1999
- Methods for the treatment of collagenous tissues for bioprosthesesBiomaterials, 1997
- Basic thermoanalytical studies of insoluble collagen matricesBiomaterials, 1996
- Physical crosslinking of collagen fibers: Comparison of ultraviolet irradiation and dehydrothermal treatmentJournal of Biomedical Materials Research, 1995
- ANALYSIS OF PHOTO‐OXIDIZED AMINO ACIDS IN TRYPTIC PEPTIDES OF CALF LENS γ‐II CRYSTALLINPhotochemistry and Photobiology, 1992
- THE REACTION OF SINGLET OXYGEN WITH PROTEINS, WITH SPECIAL REFERENCE TO CRYSTALLINSPhotochemistry and Photobiology, 1990
- Mechanism of crosslinking of proteins by glutaraldehyde III. Reaction with collagen in tissuesConnective Tissue Research, 1985