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Oxygen-scavenging coatings and films based on lignosulfonates and laccase
Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för kemiteknik. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Paper Surface Centre.
Kemiska institutionen, Department of Chemistry, Umeå Universitet.
Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för kemiteknik. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Paper Surface Centre.ORCID-id: 0000-0001-7368-7227
Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för kemiteknik. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Paper Surface Centre.ORCID-id: 0000-0002-1256-1708
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2012 (Engelska)Ingår i: Journal of Biotechnology, ISSN 0168-1656, Vol. 161, nr 1, s. 14-18Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
Amsterdam: Elsevier, 2012. Vol. 161, nr 1, s. 14-18
Nyckelord [en]
Coatings, Catalysis, Enzymes, Latexes, Mechanical properties, Polymerization, Scavenging, Starch
Nationell ämneskategori
Kemiteknik Kemi
Forskningsämne
Kemi
Identifikatorer
URN: urn:nbn:se:kau:diva-15068DOI: 10.1016/j.jbiotec.2012.06.004ISI: 000306662800002PubMedID: 22721759OAI: oai:DiVA.org:kau-15068DiVA, id: diva2:558157
Anmärkning

Water stability

Tillgänglig från: 2012-10-26 Skapad: 2012-10-02 Senast uppdaterad: 2015-10-19Bibliografiskt granskad
Ingår i avhandling
1. Oxygen-reducing enzymes in coatings and films for active packaging
Öppna denna publikation i ny flik eller fönster >>Oxygen-reducing enzymes in coatings and films for active packaging
2013 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Karlstad: Karlstads universitet, 2013. s. 91
Serie
Karlstad University Studies, ISSN 1403-8099 ; 2013:38
Nyckelord
Active packaging, food packaging, oxygen scavengers, oxygen-reducing enzymes, dispersion coating, biopolymers
Nationell ämneskategori
Kemiteknik
Forskningsämne
Kemiteknik
Identifikatorer
urn:nbn:se:kau:diva-28749 (URN)978-91-7063-516-8 (ISBN)
Disputation
2013-10-18, 9C204, Rejmersalen, Karlstad, 10:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2013-09-27 Skapad: 2013-08-27 Senast uppdaterad: 2014-10-27Bibliografiskt granskad

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Johansson, KristinJohansson, CaisaJärnström, Lars

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