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    Film formation and surface properties of enzymatically crosslinked casein films

    Year: 2011

    Journal: Journal of Applied Polymer Science Volume 119, Issue 4, pages 2205–2213, 15 February 2011, 20111221

    Authors: Helka Juvonen, 1 Maria Smolander, 2 Harry Boer, 2 Jaakko Pere, 2 Johanna Buchert, 2 Jouko Peltonen 1

    Organizations: 1 Laboratory of Paper Coating and Converting, Center for Functional Materials, A° bo Akademi University, Porthaninkatu 3, FI-20500 Turku, Finland, 2 VTT Technical Research Centre of Finland, FI-02044 VTT, Finland

    The use of renewable materials as barrier material is currently intensively investigated. Biopolymers such as polysaccharides, lipids, and proteins have been studied as barrier materials. Protein-based films often possess good gas barrier properties, but because of their hydrophilic nature the gas barrier properties are sensitive to humidity. The improvement of the properties of sodium caseinate barrier films in potential packaging applications was studied by investigating the effects of enzymatic treatment and plasticizer on the film properties. Oxidoreductases Trametes hirsuta laccase (ThL) and Trichoderma reesei tyrosinase (TrTyr) were compared with transglutaminase for crosslinking of the sodium caseinate molecules in the films and coatings. All of the studied enzymes were able to crosslink sodium caseinate. Film solubility tests, protein electrophoresis, contact angle measurements, and atomic force microscopy studies showed that TrTyr treatment results in sodium caseinate films and coatings with better overall properties compared to treatment with ThL.