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Alginate and Chitosan as a Functional Barrier for Paper-Based Packaging Materials

1
Institute of Paper, Pulp and Fibre Technology, Graz University of Technology, Inffeldgasse 23, 8010 Graz, Austria
2
Institute of Analytical Chemistry and Food Chemistry, Graz University of Technology, Stremayrgasse 9/2, 8010 Graz, Austria
3
Institute for Electron Microscopy and Nanoanalysis, NAWI Graz, Graz University of Technology and Centre for Electron Microscopy, Steyrergasse 17, 8010 Graz, Austria
*
Author to whom correspondence should be addressed.
Coatings 2018, 8(7), 235; https://doi.org/10.3390/coatings8070235
Received: 30 May 2018 / Revised: 21 June 2018 / Accepted: 27 June 2018 / Published: 3 July 2018
(This article belongs to the Special Issue Recent Progress in Food and Beverage Packaging Coatings)
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Abstract

Paper-based food packaging materials are widely used, renewable, and biodegradable. Because of its porous structure, paper has poor or no barrier performance against grease, water vapor, water, and volatile organic compounds. Moreover, recycled paperboard can be a source of organic residuals that are able to migrate into packed food. Two different types of paperboard produced from primary and secondary cellulosic fibers were coated using renewable materials, such as alginate and chitosan, and comprehensive barrier measurements showed multifunctional barrier properties of these two biomaterials. Both paper substrates were successfully coated using a draw-down coater, and the measured air permeability of the coated samples was 0 mL·min−1. Grease resistance was improved, while it was possible to reduce water vapor transmission, the migration of mineral oil saturated hydrocarbons and mineral oil aromatic hydrocarbons (MOSH/MOAH), and the permeation of volatile compounds for both paper substrates when compared with uncoated substrates. Wettability and water absorptiveness of chitosan- and alginate-coated papers were found to be substrate-dependent properties, and could be significantly affected by bio-based coatings. In summary, industrially produced paperboard was upgraded by coating it with the naturally biodegradable biopolymers, alginate and chitosan, thus achieving extraordinary barrier performance for various applications within the packaging industry. View Full-Text
Keywords: barrier coating; paper-based food packaging material; chitosan; alginate; water vapor transmission rate; MOSH/MOAH migration; permeation; grease barrier; water absorptiveness; HPLC–GC coupled with a flame ionization detector (FID) barrier coating; paper-based food packaging material; chitosan; alginate; water vapor transmission rate; MOSH/MOAH migration; permeation; grease barrier; water absorptiveness; HPLC–GC coupled with a flame ionization detector (FID)
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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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Kopacic, S.; Walzl, A.; Zankel, A.; Leitner, E.; Bauer, W. Alginate and Chitosan as a Functional Barrier for Paper-Based Packaging Materials. Coatings 2018, 8, 235.

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