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Journal of Thermal Analysis and Calorimetry

, Volume 93, Issue 2, pp 547–552 | Cite as

Biodegradable packing materials based on waste collagen hydrolysate cured with dialdehyde starch

  • F. LangmaierEmail author
  • M. Mládek
  • P. Mokrejš
  • K. Kolomazník
Article

Abstract

Hydrogels of collagen hydrolysate (H) of mean M w 15–30 kDa obtained from waste collagen from meat casings manufacture, cross-linked with 15% (based on H) polymeric dialdehyde starch (DAS), have a marked tendency to ageing, which shows in hydrogel gradually increasing rigidity and decreasing thermo-reversibility. Methods of thermal analysis (DSC, TG) proved that ageing of hydrogels is not related with a non-equilibrium state of the cross-linking reaction but is rather given by increasing density of inter-chain hydrogen bonds between polypeptide segments of H. Plasticizing effect of DAS on H is not too pronounced but the difference between glass transition temperature of dry xerogel T g = 189.5±2.5°C and temperature of starting degradation (DAS component) 241.4±12.7°C offers certain space for processing these xerogels into biodegradable (edible) packaging material by usual plastics technologies. Films obtained from the reaction mixture by casting and drying at room temperature after thermal processing (105°C for 4 h) dissolve at room temperature only after 350 h. This effect can be employed for time-controlled releasing of active substances from such biodegradable (edible) packages.

Keywords

collagen hydrolysate cross-linking dialdehyde starch glass transition 

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Copyright information

© Springer Science+Business Media, LLC. 2008

Authors and Affiliations

  • F. Langmaier
    • 1
    Email author
  • M. Mládek
    • 1
  • P. Mokrejš
    • 1
  • K. Kolomazník
    • 1
  1. 1.Institute of Polymer Engineering, Faculty of TechnologyTomas Bata UniversityZlínCzech Republic

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