Abstract
A flexible multilayer with selenium nanoparticles incorporated has been used to build an antioxidant packaging. The oxidation of hazelnuts, walnuts, and potato chips was tested at laboratory scale. Hexanal released by the nuts, fatty acids oxidation study, TBARS (thiobarbituric acid reactive substances), and tasting were compared to study the oxidation of foods packaged with this antioxidant packaging. Finally, TBARS method in combination with tasting were selected due to their simplicity and accuracy. It was found that hazelnuts packaged in nanoSe active bags released around 20% less malonaldehyde (MDA) than the blanks. In the case of the walnuts, the active ones released 25% less MDA than the blanks. As for potato chips, the improvement was around 22%. Finally, an industrial study was done. Cooked ham, chicken, and a ready-to-eat vegetable mixture seasoned with butter were industrially packaged with the new antioxidant material and improvements higher than 25% were obtained.
Highlights
Lipid oxidation is an important factor that limits the shelf-life of food
Hexanal released by the nuts, fatty acids oxidation study, thiobarbituric acid reactive substances (TBARS), and tasting were compared to study the oxidation of foods packaged with this antioxidant packaging
The antioxidant packaging was firstly evaluated using the methodology described by Pezo et al [3], based on the exposure of the packaging material to an atmosphere enriched in free radicals
Summary
Lipid oxidation is an important factor that limits the shelf-life of food It reduces the nutritional value of lipids, some fat-soluble vitamins are lost because of its reaction with free radicals, some pigments disappear, and rancidity starts. The antioxidant properties of selenium nanoparticles (SeNPs) are well known [9,10,11,12], and based on these concepts a new multilayer material containing nanoSe was built and optimized [13] This new antioxidant polymer was optimized and studied at lab scale using oxidizable model compounds. It was confirmed that SeNPs are able to trap the primary free radicals derived from oxygen [13] With this information, the new multilayer material containing nanoSe has recently been evaluated and it received a positive opinion from EFSA (European Food Safety Authority). It can be scaled up and launched into the market, as one of the few active materials in the EU market
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