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    Barrier properties of corn zein nanocomposite coated polypropylene filmsfor food packaging applications

    Year: 2013

    Journal: Journal of Food Engineering, 114, pp 505-513, 20130926

    Authors: Onur Ozcalik, Funda Tihminlioglu

    Organizations: Izmir Institute of Technology, Materials Science and Engineering Program, 35430 Gülbahçe-Urla, Izmir, Turkey, Izmir Institute of Technology, Chemical Engineering Department, 35430 Gülbahçe-Urla, _Izmir, Turkey

    The feasibility of corn zein nanocomposite (CZNC) coatings as an alternative to synthetic polymer barrierlayer on polypropylene (PP) films was examined. The effect of layered silicate content in the CZNC layerson the barrier and surface hydrophobicity of the CZNC-PP films were investigated. Incorporation oforganomodified montmorillonite (OMMT) by solution intercalation into zein matrix significantlyimproved oxygen and water vapor barrier of coated PP films. The barrier properties were also investigatedtheoretically by using various phenomenological permeability models. Tortuous permeation pathformed by the fine delamination of nanoclays was found to be responsible for the barrier improvementsin zein layers. In conclusion, durable CZNC-PP laminates were developed. CZNC coating of PP films hasreduced the oxygen permeability nearly four times, while water vapor permeability reduced by 30% with5 wt.% OMMT content in 5.9 lm corn zein coating.