In vitro and in vivo evaluation of gelatin-chondroitin sulphate hydrogels for controlled release of antibacterial proteins

Biomaterials. 2000 Sep;21(17):1763-72. doi: 10.1016/s0142-9612(00)00064-8.


Chemically cross-linked gelatin-chondroitin sulphate (ChS) hydrogels, impregnated in Dacron, were evaluated as drug delivery systems for antibacterial proteins. The gelatin-chondroitin sulphate gels, plain or impregnated in Dacron, were cross-linked with a water-soluble carbodiimide (EDC) and N-hydroxysuccinimide (NHS). The release of lysozyme and recombinant thrombocidin (rTC-1), an antibacterial protein derived from human blood platelets, from the gelatin-ChS gels in Dacron in phosphate-buffered saline at 37 degrees C was determined, and compared to the release from gelatin gels in Dacron and plain gelatin-ChS gels. The incorporation of chondroitin sulphate into gelatin gels, caused a marked increase in lysozyme loading capacity, and a slower release rate. The relative release profiles for rTC-1 and lysozyme were equal for cross-linked gelatin as well as for cross-linked gelatin-ChS gels. Furthermore, rTC-1 showed no loss of antibacterial activity after 1 week of release. The lysozyme concentration profiles in the samples and in the surrounding medium as a function of time were calculated using mathematical solutions for Ficks second law of diffusion for a semi-infinite composite medium, which is a schematic representation of a slab in a surrounding medium. The biocompatibility and degradation of the Dacron matrices impregnated with gelatin-ChS gels was studied after implantation in subcutaneous pockets in rats. Chemically cross-linked gelatin-Ch5 gels showed a mild tissue reaction, and almost complete degradation within 18 weeks of implantation.

Publication types

  • Evaluation Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Anti-Infective Agents / administration & dosage*
  • Biocompatible Materials
  • Chondroitin Sulfates / administration & dosage*
  • Gelatin / administration & dosage*
  • Humans
  • Hydrogels / administration & dosage*
  • In Vitro Techniques
  • Male
  • Muramidase / administration & dosage
  • Proteins / administration & dosage*
  • Rats
  • Rats, Wistar


  • Anti-Infective Agents
  • Biocompatible Materials
  • Hydrogels
  • Proteins
  • Gelatin
  • Chondroitin Sulfates
  • Muramidase