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Extruded polymer films for optimal enzyme-catalyzed oxygen scavenging
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
Tampere University of Technology. (Dept. of Materials Science)
Nofima. (Dept. of Processing Technology)
Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.ORCID iD: 0000-0001-7368-7227
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2014 (English)In: Chemical Engineering Science, ISSN 0009-2509, E-ISSN 1873-4405, Vol. 108, 1-8 p.Article in journal (Refereed) Published
Abstract [en]

The use of enzymes as oxygen scavengers has a great potential in the food packaging industry. Enzymes can be incorporated into a coating layer that can be applied directly onto the packaging material. For the system to be fully functional, there is however a need for the packaging to have some barrier properties, to be sealable through heat, and to ensure low or no migration of the active coating to the food. Various combinations of the polypropylene (PP), poly(lactic acid) (PLA) and low density polyethylene (LDPE) were extruded onto board coated with the oxygen-scavenging enzyme. Properties such as oxygen-transmission rate, water-vapor transmission rate, heat-sealability, migration and oxygen scavenging capacity were evaluated. All combinations of extruded material resulted in a packaging material able to scavenge the oxygen at both 84% and 100% relative humidity. The greatest decrease in oxygen concentration of the head space of air-tight chambers was achieved with the material extruded with PLA on at least one side. It was found that the extruded plastic is necessary in order to meet the EU directives on migration from food packaging materials of not more than a total of 10 mg/dm2 material. All plastics were heat sealable against themselves but not against any of the other plastics and only LDPE adhered strongly to the enzyme-containing coating

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2014. Vol. 108, 1-8 p.
Keyword [en]
Oxygen scavenging, glucose oxidase, water vapor, migration, extrusion coating
National Category
Chemical Engineering Industrial Biotechnology
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-28460DOI: 10.1016/j.ces.2013.12.035ISI: 000332392100001OAI: oai:DiVA.org:kau-28460DiVA: diva2:635959
Available from: 2013-07-08 Created: 2013-07-08 Last updated: 2016-10-04Bibliographically 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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Johansson, KristinJohansson, CaisaJärnström, Lars
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