Chitosan coating for the preparation of multilayer coated paper for food-contact packaging: Wettability, mechanical properties, and overall migration
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Publication Details
Author list: Supachok Tanpichai; Yanee Srimarut; Weerapong Woraprayote; Yuwares Malila;
Publisher: Elsevier
Publication year: 2022
Journal: International Journal of Biological Macromolecules (0141-8130)
Volume number: 213
Start page: 534
End page: 545
Number of pages: 12
ISSN: 0141-8130
Languages: English-Great Britain (EN-GB)
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Abstract
Cellulose-based paper is an alternative substitution for petroleum-based polymers for packaging applications, but its mechanical performance is poor when in contact with water. Herein, chitosan was applied on cellulose-based paper via a coating approach. The effects of chitosan coatings between none and five layers on the color properties, wettability, thermal properties, mechanical performance, and overall migration in food simulants of the paper were evaluated. After the application of chitosan, chitosan first filled cavities between cellulose fibers within a network, and the chitosan film was formed on the paper surface later. This resulted in a pronounced increase in wettability and mechanical properties associated with a loss of whiteness and an increase in yellowness of the coated paper. The chitosan-coated paper became hydrophobic with a water contact angle of 94.7 ± 2.8°, and a robust improvement of 156.4% for tensile strength and 114.8% for strain at break was observed for the paper coated with three layers of chitosan in wet conditions in comparison to the uncoated paper. A reduction in the migration of the low molecular residuals from the paper could be hindered by the chitosan coating. These enhanced features revealed that chitosan-coated paper could be used as a food-contact material. © 2022
Keywords
Color properties, Food-contact packaging
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