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LDPE/PET laminated films modified with FeO(OH) × H2O, Fe2O3, and ascorbic acid to develop oxygen scavenging system for food packaging

抗坏血酸 低密度聚乙烯 聚对苯二甲酸乙二醇酯 氧气 材料科学 活性包装 化学工程 聚乙烯 核化学 化学 复合材料 食品包装 有机化学 食品科学 工程类
作者
Agnieszka Wołosiak‐Hnat,Krzysztof Zych,Monika Mężyńska,Andrzej Kifonidis,Maksymilian Dajworski,Sławomir Lisiecki,Artur Bartkowiak
出处
期刊:Packaging Technology and Science [Wiley]
卷期号:32 (9): 457-469 被引量:12
标识
DOI:10.1002/pts.2449
摘要

The iron compounds (iron(III) oxide‐hydroxide monohydrate FeO(OH) × H 2 O, iron(III) oxide Fe 2 O 3 , and ascorbic acid) were used as oxygen scavengers modifiers in laminating of polymer films. This oxygen‐scavenging system was coated on preselected films (low density polyethylene [LDPE] and polyethylene terephthalate [PET]) from which the laminates were formed. It presents the new form of composite material packaging that has the function of oxygen scavenging, which could be suitable for food packaging. The scope of the research included studies of morphology of oxygen scavengers by scanning electron microscope and their average particle size distribution measure by particle size analyzer, the effect of type, and concentration of these substances on viscosity of adhesive and seal strength of laminates. The Fourier‐transform infrared spectroscopy (FTIR) of laminates was also performed to observe the potential interaction of functional groups of polyurethane adhesives with oxygen scavenger components. The most important ability of the developed system for oxygen scavenging was confirmed by measuring oxygen concentration (% vol) in a headspace with the prepared laminates. The concentrations of selected oxygen scavengers (4‐6 wt%) and their combinations were studied. The most effective oxygen scavenger system integrated within the PE/PET composite film consists of 6 wt% ascorbic acid and 1 wt% FeO(OH) × H 2 O, where the oxygen concentration of 1.0 vol% (±0.20 vol%) was obtained after 15 days of storage. It was found that in this system the oxygen scavenging reaction occurs through ascorbate oxidation to dehydroascorbic acid, which is catalyzed by reduction of Fe 3+ to Fe2 + ions.
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