Biodegradable packing materials based on waste collagen hydrolysate cured with dialdehyde starch
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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.
Keywordscollagen hydrolysate cross-linking dialdehyde starch glass transition
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- 1.E. Heidemann, A. Hein, R. Moldehn and Ch. Knöker, Leder, 47 (1991) 133.Google Scholar
- 2.K. Kolomaznik, M. Mladek, F. Langmaier and D. Janacova, JALCA, 95 (2000) 55.Google Scholar
- 3.F. Langmaier, K. Kolomaznik and M. Mládek, Materialien des 1. Freiberger Kollagensymposium, Freiberg/Sa 1996, pp. 120–124, FILK, Freiberg 1996.Google Scholar
- 5.F. Langmaier, M. Mladek, K. Kolomaznik and A. Maly, Tenside, Surfactants, Detergents, 39 (2000) 47.Google Scholar
- 9.R. H. Wilson, Proc. Soc. Exp. Biol. Med., 102 (1959) 735.Google Scholar
- 11.F. Langmaier, P. Mokrejs, K. Kolomaznik and M. Mladek, Waste Management — in press (2006).Google Scholar
- 12.BS 757 1979. British Standard Methods of Sampling and Testing Gelatins.Google Scholar
- 13.Te. K. Nijenhuis, Physical Network Polymers and Gels, W. Burchard and B. S. Ross-Murphy, Eds, Elsevier, London, New York 1990, pp. 15–33.Google Scholar
- 18.I. V. Yannas, J. Macromol. Sci. Chem., C7 (1972) 49.Google Scholar
- 22.A. S. Marshalll and S. E. B. Petrie, J. Photographic Sci., 28 (1980) 128.Google Scholar
- 23.T. Hatakeyama and F. X. Quinn, Thermal Analysis. Fundamentals and Applications to Polymer Science, J. Wiley and Sons, New York 1999, pp. 90–91.Google Scholar