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    Biodegradable κ-carrageenan/nanoclay nanocomposite films containing Rosmarinus officinalis L. extract for improved strength and antibacterial performance

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    Authors
    Nouri, A.
    Tavakkoli Yaraki, M.
    Ghorbanpour, M.
    Wang, Shaobin
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Nouri, A. and Tavakkoli Yaraki, M. and Ghorbanpour, M. and Wang, S. 2018. Biodegradable κ-carrageenan/nanoclay nanocomposite films containing Rosmarinus officinalis L. extract for improved strength and antibacterial performance. International Journal of Biological Macromolecules. 115: pp. 227-235.
    Source Title
    International Journal of Biological Macromolecules
    DOI
    10.1016/j.ijbiomac.2018.04.051
    ISSN
    0141-8130
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/67445
    Collection
    • Curtin Research Publications
    Abstract

    In this study, biodegradable κ-carrageenan films containing 3% nanoclay and different amounts of rosemary extract (1, 2 and 3% v/v) were fabricated and their physical, thermal, and mechanical properties, as well as antimicrobial activity were examined. The film thickness did not change significantly by the addition of rosemary extract. UV light transmission value in the control film was 20.46%, while the value for the film with 3% v/v rosmary extract reduced to 0.13%. Elongation at break (EB%) and tensile strength (TS) of the carrageenan film without the extract were 19.07% and 15.96 MPa, respectively, while after adding 3% v/v of rosemary extract, the EB and TS were increased to 27.17% and 30.77 MPa, respectively. Incorporation of rosemary extract greatly reduced water vapor permeability (WVP) (5.27 × 10−10 g/m·s·Pa in control film vs 2.14 × 10−10 g/m·s·Pa in the film containing 3% v/v rosemary extract). More importantly, the carrageenan film with 3% extract displayed >99% inhibition against B. cereus, E. coli, P. aeruginosa, and S. aureus compared with the control film. The present study showed that rosemary extract is an excellent additive to enhance the mechanical strength and antibacterial activity of carrageenan films and can be used for active packing in food packing industry.

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