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Nanomaterials 2018, 8(7), 479;

Nanocomposite Zinc Oxide-Chitosan Coatings on Polyethylene Films for Extending Storage Life of Okra (Abelmoschus esculentus)

Department of Marine Science and Fisheries, Sultan Qaboos University, PO Box 34, Al-Khoud, 123 Muscat, Oman
Ministry of Municipalities and Water Resources, 112 Muscat, Oman
Functional Materials, Applied Physics Department, SCI School, KTH Royal Institute of Technology, Kista, SE-164 40 Stockholm, Sweden
Center of Excellence in Marine Biotechnology, Sultan Qaboos University, PO Box 50, Al-Khoud, 123 Muscat, Oman
Author to whom correspondence should be addressed.
Received: 30 May 2018 / Revised: 23 June 2018 / Accepted: 26 June 2018 / Published: 29 June 2018
(This article belongs to the Special Issue Food Packaging Based on Nanomaterials)
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Efficiency of nanocomposite zinc oxide-chitosan antimicrobial polyethylene packaging films for the preservation of quality of vegetables was studied using okra Abelmoschus esculentus. Low density polyethylene films (LDPE) coated with chitosan-ZnO nanocomposites were used for packaging of okra samples stored at room temperature (25 °C). Compared to the control sample (no coating), the total bacterial concentrations in the case of chitosan and nanocomposite coatings were reduced by 53% and 63%, respectively. The nanocomposite coating showed a 2-fold reduction in total fungal concentrations in comparison to the chitosan treated samples. Results demonstrate the effectiveness of the nanocomposite coatings for the reduction of fungal and bacterial growth in the okra samples after 12 storage days. The nanocomposite coatings did not affect the quality attributes of the okra, such as pH, total soluble solids, moisture content, and weight loss. This work demonstrates that the chitosan-ZnO nanocomposite coatings not only maintains the quality of the packed okra but also retards microbial and fungal growth. Thus, chitosan-ZnO nanocomposite coating can be used as a potential coating material for active food packaging applications. View Full-Text
Keywords: ZnO nanoparticle; nanocomposite coating; chitosan; antimicrobial; active food packaging ZnO nanoparticle; nanocomposite coating; chitosan; antimicrobial; active food packaging

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Al-Naamani, L.; Dutta, J.; Dobretsov, S. Nanocomposite Zinc Oxide-Chitosan Coatings on Polyethylene Films for Extending Storage Life of Okra (Abelmoschus esculentus). Nanomaterials 2018, 8, 479.

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