Get access

Ring-opening polymerization of genipin and its long-range crosslinking effect on collagen hydrogel

Authors

  • Changdao Mu,

    1. Department of Pharmaceutical and Bioengineering, School of Chemical Engineering, Sichuan University, Chengdu 610065, China
    Search for more papers by this author
  • Ke Zhang,

    1. Department of Pharmaceutical and Bioengineering, School of Chemical Engineering, Sichuan University, Chengdu 610065, China
    Search for more papers by this author
  • Wei Lin,

    1. National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu 610065, China
    Search for more papers by this author
  • Defu Li

    Corresponding author
    1. Department of Pharmaceutical and Bioengineering, School of Chemical Engineering, Sichuan University, Chengdu 610065, China
    • Department of Pharmaceutical and Bioengineering, School of Chemical Engineering, Sichuan University, Chengdu 610065, China
    Search for more papers by this author

  • How to cite this article: Mu C, Zhang K, Lin W, Li D. 2013. Ring-opening polymerization of genipin and its long-range crosslinking effect on collagen hydrogel. J Biomed Mater Res Part A 2013:101A:385–393.

Abstract

Polymeric genipin macromers, prepared by ring-opening polymerization at various pH values, are used as crosslinking agents to fix collagen hydrogels. The results indicate that as the dark color of polymeric genipin itself and the networks formed by long-range intermolecular crosslinking, the genipin-fixed collagen hydrogels displace darker color. The polymeric genipin prepared at higher pH value needs longer time to fully crosslink with collagen molecules. Moreover, polymerization of genipin reduces the yield of genipin-fixed collagen hydrogels due to low extent of crosslinking. Specially, the microscope photographs present the porous networks structures of genipin-fixed collagen hydrogels. The pore size increases with the increase in polymerization degree of genipin. The data of FTIR indicate the likely transition of –NH2 groups in collagen chains into C=N. Owning to much more number of hydrophilic groups and more porous networks, collagen hydrogels fixed by genipin with higher polymerization degree have higher water absorption capacity. The equilibrium swelling of genipin-fixed collagen hydrogels is pH-responsive, which show “M” type changes with the pH values. The results obtained in the study suggest that the polymeric genipin prepared at various pH values lead to significant influence to the crosslinking characteristics and properties of collagen hydrogels. © 2012 Wiley Periodicals, Inc. J Biomed Mater Res Part A, 2013.

Ancillary