• Login
    View Item 
    •   NM-AIST Home
    • Materials, Energy, Water and Environmental Sciences
    • Research Articles
    • View Item
    •   NM-AIST Home
    • Materials, Energy, Water and Environmental Sciences
    • Research Articles
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Release Kinetic Models of Vanillin and Physicomechanical Properties of Thermoplastic Starch and Chitosan Nanocomposite Films: Effects of Mixing Order

    Thumbnail
    View/Open
    Abstract (121.9Kb)
    Date
    2020-02-20
    Author
    Mlalila, Nichrous
    Hilonga, Askwar
    Kaale, Lilian
    Swai, Hulda
    Metadata
    Show full item record
    Abstract
    The effects of mixing sequence of starch–chitosan nanocomposite films on antimicrobial properties of vanillin, the release kinetics of vanillin, and physicomechanical changes of films have been reported. Four types of films were prepared based on the order of mixing. SC1: starch–glycerol–MMT–vanillin; SC2: starch–glycerol–chitosan–MMT–vanillin; SC3: starch–MMT–glycerol–vanillin–chitosan and SC4: starch–chitosan–glycerol–vanillin–MMT. All formulation exhibited high antimicrobial activity against E. coli, S. enterica, and Z. bailii, except P. aeruginosa, which showed lower sensitivity. Migration dynamics of vanillin from films into simulants showed high vanillin migrated into water and 10% ethanol at 25 and 40 °C as analyzed by high-performance liquid chromatography (HPLC). The diffusion coefficients of vanillin in water ranged between 0.38 × 10−13m2 s−1 and 4.30 × 10−13m2 s−1 and in 10% ethanol between 1.38 × 10−13m2 s−1 and 5.16 × 10−13m2 s−1 following the Fickian diffusion mechanism and first-order kinetics. The diffusion was temperature-dependent following the Arrhenius equation with high activation energies of 15.00–52.80 kJmol−1 in water and 35.80–56.50 kJ mol−1 in 10% ethanol. The plot of the mass fraction of mt/m∞ against time for each sample shows the burst release of vanillin in between 30 min and 1 h and then attained the steady-state migration over 48 h. The plasticization effect of vanillin reduced the tensile strength and elastic modulus of films, while it increased the elongation at the break by 154% that was reversed after the addition of chitosan. These nanostructured starch films showed promising applications in the antimicrobial packaging industry.
    URI
    https://doi.org/10.1007/s41783-020-00084-y
    http://dspace.nm-aist.ac.tz/handle/123456789/602
    Collections
    • Research Articles

    Nelson Mandela-AIST copyright © 2021  DuraSpace
    Theme by 
    Atmire NV
     

     

    Browse

    All PublicationsCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    Nelson Mandela-AIST copyright © 2021  DuraSpace
    Theme by 
    Atmire NV