Oxygen scavenging polymer coating prepared by hydrophobic modification of glucose oxidase / Dana E. Wong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 2 (03/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 2 (03/2017) . - p. 489–495 Titre : Oxygen scavenging polymer coating prepared by hydrophobic modification of glucose oxidase Type de document : texte imprimé Auteurs : Dana E. Wong, Auteur ; Stephanie M. Andler, Auteur ; Christina Lincoln, Auteur ; Julie M. Goddard, Auteur ; Joey N. Talbert, Auteur Année de publication : 2017 Article en page(s) : p. 489–495 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aliments -- Emballages -- Aspect sanitaire Capteurs chimiques Copolymère éthylène acétate de vinyle Désoxygénation Glucose oxydase La glucose oxydase (GOx, GOD) est une enzyme oxydo-réductase (EC 1.1.3.4) qui catalyse l'oxydation du glucose en peroxyde d'hydrogène et en D-glucono-δ-lactone. Dans les cellules, elle participe à cliver les sucres (oses), notamment le saccharose (Glc-Fru) en métabolites. La GOx est largement utilisée pour déterminer la concentration en glucose libre dans les fluides corporels (diagnostic), et dans les aliments (industrie). Elle a de nombreuses applications en biotechnologies, typiquement les tests enzymatiques de biochimie. Ions Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : Trace oxygen in packaged foods, beverages, and pharmaceuticals can promote a range of oxidative degradation reactions and support microbial growth, ultimately impacting product quality and shelf-life. Oxygen scavenging active packaging systems have therefore been explored to control headspace oxygen content. Herein, we report on a hydrophobic ion pairing method to render glucose oxidase hydrophobic, and thus soluble in organic solvents. Hydrophobic modified glucose oxidase was blended with ethylene vinyl acetate and cast on the interior of glass vials to demonstrate potential as a commercially translatable coating method for enzyme immobilization. The resulting oxygen scavenging polymer coatings were topographically uniform and presented 0.553 μg/cm2 enzyme at the coating interface. The coatings effectively reduced headspace oxygen by 2% in a closed-vial system filled 50 vol% with citrate buffer, pH 3.5. Less than 25% protein migrated from the coating over an 8-week leaching study, with no detectable protein leached in the first 4 weeks. Hydrophobic ion pairing of glucose oxidase enabled a facile, high-throughput enzyme immobilization technique without use of complicated, time-consuming surface modification chemistries and reagents. Such oxygen scavenging polymer coatings can support controlling headspace oxygen in packaged goods, and thus retaining stability of oxygen-sensitive components such as colors, flavors, and nutrients. Note de contenu : - Characterization of glucose oxidase embedded polymer coatings - Protein migration - Oxygen scavenging capacity of glucose oxidase embedded polymer coatings DOI : 10.1007/s11998-016-9865-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9865-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28163 [article]

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Preparation of metal chelating active packaging materials by laminated photografting / Zhuangsheng Lin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 2 (03/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 2 (03/2016) . - p. 395-404 Titre : Preparation of metal chelating active packaging materials by laminated photografting Type de document : texte imprimé Auteurs : Zhuangsheng Lin, Auteur ; Eric A. Decker, Auteur ; Julie M. Goddard, Auteur Année de publication : 2016 Article en page(s) : p. 395-404 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acide polyacrylique Chélates Copolymères greffés Emballages en matières plastiques Fer Matériaux -- Propriétés barrières polyacide hydroxamique Polypropylène Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : Active packaging materials with surface immobilized metal chelating ligands were prepared by laminated photografting technique. The resulting materials presented transition metal scavenging properties with potential application in non-migratory antioxidant active packaging materials. Photografting of functional polymer ligands is typically performed in an oxygen-free environment, requiring a nitrogen inerting step, which limits potential industrial scale-up. Laminated photografting eliminates the need for nitrogen inerting by sandwiching the monomer solution between base material and an oxygen barrier layer. In this study, we demonstrated the ability to synthesize metal chelating active packaging materials, previously prepared by standard batch photografting, using a laminated photografting technique. The polypropylene-graft-poly(acrylic acid) and polypropylene-graft-poly(hydroxamic acid) chelating films prepared by laminated photografting presented similar surface chemistry as those reported previously, as characterized by infrared spectroscopy, and presented ferric ion chelating capacity of 182 ± 29 and 89 ± 10 nmol/cm2, respectively, at pH 5.0. The reported laminated photografting represents a coating technology with potential for adaptation to roll-to-roll manufacture of metal chelating films on an industrial scale. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Materials - Surface modification - Surface characterization - Iron chelating capacity - Statistics - RESULTS AND DISCUSSION : Surface characterization - Iron chelating capacity DOI : 10.1007/s11998-015-9767-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9767-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26123 [article]

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