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Effects of storage conditions and acid solvent types on structural, mechanical and physical properties of kudzu starch (Pueraria lobata)-chitosan composite films

Authors

  • Yu Zhong,

    1. Institute of Refrigeration and Cryogenic Engineering, Shanghai Jiao Tong University, Shanghai, P. R. China
    2. Department of Food Science and Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, P. R. China
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  • Yunfei Li

    Corresponding author
    1. Department of Food Science and Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, P. R. China
    2. Bor Luh Food Safety Center, Shanghai Jiao Tong University, Shanghai, P. R. China
    • Department of Food Science and Technology, School of Agriculture and Biology, Shanghai Jiao Tong University 800 Dongchuan Road, Shanghai 200240, P. R. China. Fax: +86 21 34206918.
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Abstract

Effects of acid solvents (acetic, lactic and malic acid) on properties of kudzu starch-chitosan composite films were evaluated at −20 or 25°C during storage of 60 days. The yellowness of films enhanced, whereas water content and water vapour permeability of films declined with increasing storage time. Tensile strength of films choosing acetic and lactic acid as solvents, and solubility of all the films increased within 30 days thereafter decreased. Storage temperature had no impact on X-ray diffraction, water content and solubility. Under the same storage conditions, the film using acetic acid as solvent presented the strongest mechanical property, the smallest solubility and the lightest colour. The film made from lactic acid solution was the most flexible and the yellowiest. The film with malic acid solvent showed the highest ordering degree, the lowest water content and the best water barrier property.

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