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Functional Coatings Based on Natural Materials in Various Consumer Products

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Green Chemistry".

Deadline for manuscript submissions: closed (31 August 2021) | Viewed by 2333

Special Issue Editors


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Guest Editor
Natural Resources Institute Finland (Luke), Helsinki, Finland
Interests: biomass fractionation; extraction techniques; chemical characterization; separation techniques; functional surfaces

E-Mail Website
Guest Editor
Natural Resources Institute Finland (Luke), Helsinki, Finland
Interests: biomass formation processes, characterization and properties, and comprehensive utilization

Special Issue Information

Dear Colleagues,

Forestry, agro- and food production, and aquaculture production systems yield significant volumes of side- and by-products that are potential sources of functional molecules and bioproducts for various applications. To explore the potential of such sources for the development of biobased coatings and other functional materials with biological activities, it is necessary to develop new feedstock processing concepts and technological solutions that meet the requirements of effective, safe, easy-to-use, sustainable, and acceptable consumer products.

Despite the range of natural compounds already on the market, there is a need to identify bioactive molecules (e.g., polysaccharides, proteins and peptides, polyunsaturated fatty acids, waxes, and polyphenols) from different natural sources with functional properties including hydrophobic, antifungal, antibacterial, antiviral, and antioxidative effects. This Special Issue aims to identify and gather the latest information on the various sources of bioproducts, and the methods used for extraction, purification, and characterization of the functional properties. Additionally, the application mechanisms in different products such as coatings or films within matrices of packaging and/or other hybrid materials, or as paints or sprays, are of great interest. Additionally, the aspects of regulation and acceptance are included in this Special Issue.

Dr. Risto Korpinen
Dr. Tuula Jyske
Guest Editors

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Published Papers (1 paper)

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Research

12 pages, 2303 KiB  
Article
Fractionated Lignosulfonates for Laccase-Catalyzed Oxygen-Scavenging Films and Coatings
by Sandra Winestrand, Lars Järnström and Leif J. Jönsson
Molecules 2021, 26(20), 6322; https://doi.org/10.3390/molecules26206322 - 19 Oct 2021
Cited by 5 | Viewed by 1902
Abstract
Lignin derivatives have potential as antioxidants in advanced packaging materials through their ability to scavenge oxygen in reactions catalyzed by phenol-oxidizing enzymes, such as laccase. The effects of size fractionation of lignosulfonates on laccase-catalyzed reactions were investigated in experiments with aqueous solutions, films, [...] Read more.
Lignin derivatives have potential as antioxidants in advanced packaging materials through their ability to scavenge oxygen in reactions catalyzed by phenol-oxidizing enzymes, such as laccase. The effects of size fractionation of lignosulfonates on laccase-catalyzed reactions were investigated in experiments with aqueous solutions, films, and coated paperboard. Four industrial lignosulfonate preparations were compared: Feed (unfractionated), Prod (5–60 kDa enriched), Conc (≥60 kDa enriched), and Perm (≤60 kDa enriched). Extraction of lignosulfonates from films showed that the enzymic reaction increased the average molecular weight from <10,000 to up to 66,000. The enzymatic reaction resulted in an increase in the water contact angle of the films from the range 25–49° to 56–81°. The four preparations showed relatively small differences with regard to their ability to scavenge oxygen in aqueous solution and in experiments with coated paperboards in sealed chambers. Coatings with lignosulfonates where the contents of low-molecular weight material had been reduced (i.e., Prod and Conc) showed improved water resistance after the enzymic reaction. Thus, in both aqueous and solid media, fractionation of lignosulfonates had little effect on oxygen scavenging, but fractionation was beneficial for other reasons, such as improved cross-linking resulting in higher molecular weight and superior water resistance. Full article
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