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The effects of coating structure and water-holding capacity on the oxygen-scavenging ability of enzymes embedded in the coating layer
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörs- och kemivetenskaper (from 2013).
Energy and Process Engineering, Tampere University of Technology.ORCID-id: 0000-0002-6832-0444
Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Paper Surface Centre. Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörs- och kemivetenskaper (from 2013).ORCID-id: 0000-0001-7368-7227
Kemiska institutionen, Department of Chemistry, Umeå Universitet.
Visa övriga samt affilieringar
2013 (Engelska)Ingår i: TAPPI Journal, ISSN 0734-1415, Vol. 12, nr 6, s. 43-52Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Enzymes catalyzing oxygen scavenging were embedded in latex-based coatings with and without barrier kaolin clay to produce material for active packages. The clay was used to create a porous structure, and the closed-structure matrix consisted of a biopolymer comprising either starch or gelatin to increase the water uptake of the coating. The effects of the porous open structure and of the water uptake of the coated layer on the oxygen-scavenging ability of the embedded enzymes were examined at both 75% and 100% relative humidity. The results showed that the porous clay structure led to higher oxygen-scavenging capacity than that of a closed structure at both test conditions by enabling a high diffusion rate for oxygen and glucose to the active sites of the enzymes. The addition of a water-holding biopolymer did not always significantly affect the oxygen-scavenging capacity. However for a less-porous layer at 100% relative humidity, an increase in the amount of biopolymer resulted in an increase in oxygen-scavenging capacity. The results were treated statistically using multiple-factor analysis where the most important factor for the oxygen-scavenging ability was found to be the addition of clay. The coatings were also characterized with respect to water vapor uptake, overall migration, porosity, and scanning electron microscopy images.

Ort, förlag, år, upplaga, sidor
TAPPI Press, 2013. Vol. 12, nr 6, s. 43-52
Nyckelord [en]
Active packaging, oxygen scavenging, enzymes, coating
Nationell ämneskategori
Kemiteknik Industriell bioteknik
Forskningsämne
Kemiteknik
Identifikatorer
URN: urn:nbn:se:kau:diva-28458ISI: 000321046600005OAI: oai:DiVA.org:kau-28458DiVA, id: diva2:635953
Tillgänglig från: 2013-07-08 Skapad: 2013-07-08 Senast uppdaterad: 2019-06-10Bibliografiskt 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, KristinChristophliemk, HannaJohansson, CaisaJärnström, Lars

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Johansson, KristinChristophliemk, HannaJohansson, CaisaJärnström, Lars
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Institutionen för ingenjörs- och kemivetenskaper (from 2013)Paper Surface CentreAvdelningen för kemiteknik
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