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Effect of kraft lignin on protein aggregation, functional, and rheological properties of fish protein-based material

Authors

  • Yotsavimon Sakunkittiyut,

    1. Department of Food Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, Tungkru, Bangkok 10140, Thailand
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  • Thiranan Kunanopparat,

    Corresponding author
    1. Pilot Plant Development and Training Institute, King Mongkut's University of Technology Thonburi, Tungkru, Bangkok 10140, Thailand
    • Pilot Plant Development and Training Institute, King Mongkut's University of Technology Thonburi, Tungkru, Bangkok 10140, Thailand
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  • Paul Menut,

    1. UMR 1208 Ingénierie des Agropolymères et Technologies Emergentes, INRA, CIRAD, Montpellier SupAgro, Université Montpellier 2, F-34000 Montpellier, France
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  • Suwit Siriwattanayotin

    1. Department of Food Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, Tungkru, Bangkok 10140, Thailand
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Abstract

The main drawbacks of protein-based bioplastics are a high sensitivity to water, insufficient mechanical properties, and a narrow window of processing conditions. The objective of this work was to study the effect of Kraft lignin (KL) on protein aggregation, functional, and rheological properties of fish protein (FP)-based bioplastic. FP powder was blended with 30% glycerol and 0–70% KL. Then, blends were thermoformed by compression molding. KL addition increased protein solubility in sodium dodecyl sulfate buffer, indicating a decrease of protein molecular weight. An introduction of KL in protein blend increased mechanical properties and decreased water absorption of materials. KL addition resulted in a decrease in storage modulus in rubbery state of protein blends. It also resulted in a decrease in viscosity of protein blends at processing temperature, as determined by capillary rheometry. Therefore, KL is an alternative additive to enlarge the protein thermal processing window and improve functional properties of FP-based materials. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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