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Evaluation of collagen crosslinking techniques.

K Weadock, R M Olson, F H Silver

    Biomaterials, Medical Devices, and Artificial Organs
    |January 1, 1983
    PubMed
    Summary
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    New collagen crosslinking methods using cyanamide and dehydration offer comparable properties to glutaraldehyde (GTA) crosslinking. These physical and chemical techniques enhance biomaterial crosslinking potential and may improve tissue integration.

    Area of Science:

    • Biomaterials Science
    • Biochemistry
    • Materials Engineering

    Background:

    • Collagen is a primary biomaterial for tissue engineering.
    • Glutaraldehyde (GTA) is a common chemical crosslinker for collagen.
    • Limitations of GTA crosslinking necessitate exploration of alternative methods.

    Purpose of the Study:

    • To compare physical and chemical crosslinking techniques for collagen films.
    • To evaluate alternative crosslinking agents and methods against glutaraldehyde (GTA).
    • To assess the efficacy and biocompatibility of novel crosslinking strategies.

    Main Methods:

    • Collagen films were crosslinked using ultraviolet (UV) irradiation, severe dehydration, cyanamide, and glutaraldehyde (GTA).
    • Physical methods included UV (254 nm) exposure and severe dehydration.

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  • Chemical methods involved immersion in cyanamide or GTA solutions.
  • Combinations of cyanamide and dehydration were also investigated.

    • Main Results:

    • Collagen films crosslinked with cyanamide and dehydration showed comparable elasticity, swelling, and collagenase resistance to GTA-crosslinked films.
    • Theoretical analysis suggests cyanamide and dehydration engage significantly more crosslinking sites than GTA.
    • Crosslinking with dehydration or cyanamide involves both amino and carboxyl residues, potentially creating synergistic effects.

    Conclusions:

    • A two-step procedure using cyanamide and severe dehydration effectively crosslinks collagen biomaterials.
    • The primary byproduct of this novel method is water-soluble urea.
    • Preliminary biocompatibility data indicate potential for enhanced tissue ingrowth with this method.