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Oxygen-scavenging coatings and films based on lignosulfonates and laccase
Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
Kemiska institutionen, Department of Chemistry, Umeå Universitet.
Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.ORCID iD: 0000-0001-7368-7227
Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.ORCID iD: 0000-0002-1256-1708
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2012 (English)In: Journal of Biotechnology, ISSN 0168-1656, Vol. 161, no 1, 14-18 p.Article in journal (Refereed) Published
Abstract [en]

Laccase and lignosulfonates were included in coating colors and embedded in latex-based or starch-based films and coatings on foil or board. After 6 days at 23C and 100% relative humidity, the oxygen content in airtight chambers decreased from 1.0% (synthetic gas consisting of 99% N2 and 1% O2) to 0.3% in the presence of board coated with lignosulfonate and laccase, while the oxygen content remained unchanged in control experiments without enzyme. The water stability of lignosulfonate-containing latex-based coatings and starch-based films was improved after laccase-catalyzed oxidation of lignosulfonates, which indicates polymerization to products with lower solubility in water. Furthermore, the E' modulus of starch-based films increased with 30%, which indicates laccase-catalyzed polymerization of lignosulfonates resulting in increased stiffness of the film. The results suggest that laccases and lignosulfonates can be used as an oxygen-scavenging system in active packaging and that enzyme-catalyzed polymerization of lignosulfonates contributes to improved water stability and mechanical properties. 2012 Elsevier B.V.

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2012. Vol. 161, no 1, 14-18 p.
Keyword [en]
Coatings, Catalysis, Enzymes, Latexes, Mechanical properties, Polymerization, Scavenging, Starch
National Category
Chemical Engineering Chemical Sciences
Research subject
Chemistry
Identifiers
URN: urn:nbn:se:kau:diva-15068DOI: 10.1016/j.jbiotec.2012.06.004ISI: 000306662800002PubMedID: 22721759OAI: oai:DiVA.org:kau-15068DiVA: diva2:558157
Note

Water stability

Available from: 2012-10-26 Created: 2012-10-02 Last updated: 2015-10-19Bibliographically approved
In thesis
1. Oxygen-reducing enzymes in coatings and films for active packaging
Open this publication in new window or tab >>Oxygen-reducing enzymes in coatings and films for active packaging
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Oxygen scavengers are used in active packages to protect the food against deteriorative oxidation processes. The aim of this work was to investigate the possibilities to produce oxygen-scavenging packaging materials based on oxygen-reducing enzymes. The enzymes were incorporated into a dispersion coating formulation applied onto a food-packaging board using conventional laboratory coating techniques.

Various enzymes were used: a glucose oxidase, an oxalate oxidase and three laccases originating from different organisms. All of the enzymes were successfully incorporated into a coating layer and could be reactivated after drying. For at least two of the enzymes, re-activation was possible not only by using liquid water but also by using water vapour. Re-activation of the glucose oxidase and a laccase required relative humidities of greater than 75% and greater than 92%, respectively.

Catalytic reduction of oxygen gas by glucose oxidase was promoted by creating an open structure through addition of clay to the coating at a level above the critical pigment volume concentration. Migration of the enzyme and the substrate was reduced by adding an extrusion-coated liner of polypropylene on top of the coating.

For the laccase-catalysed reduction of oxygen it was possible to use lignin derivatives as substrates for the enzymatic reaction. The laccase-catalysed reaction created a polymeric network by cross-linking of lignin-based entities, which resulted in increased stiffness and increased water-resistance of biopolymer films. The laccases were also investigated with regard to their potential to function as oxygen scavengers at low temperatures. At 7°C all three laccases retained more than 20% of the activity they had at room temperature (25°C), which suggests that the system is also useful for packaging of refrigerated food.

Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2013. 91 p.
Series
Karlstad University Studies, ISSN 1403-8099 ; 2013:38
Keyword
Active packaging, food packaging, oxygen scavengers, oxygen-reducing enzymes, dispersion coating, biopolymers
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-28749 (URN)978-91-7063-516-8 (ISBN)
Public defence
2013-10-18, 9C204, Rejmersalen, Karlstad, 10:15 (English)
Opponent
Supervisors
Available from: 2013-09-27 Created: 2013-08-27 Last updated: 2014-10-27Bibliographically approved

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