Predictive modeling the changes of crypto climate inside packaging during storage

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For products packed in modified atmosphere packaging, the important determinant of quality preservation of packed product is mixture of gases in package, which must be selected individually for each packed product. Gas mixture composition during storage period is changing from reaction in product - crypto climate inside the package system, as well as crypto climate inside the package - packaging material - microclimate system. Qualitative parameter, which characterizes mixture of gases in analyzed snacks in MAP is oxygen content in the package. The aim of this work was to analyze changes of oxygen content in packaging of snacks depending on type of packaging and initial composition of gas mixture in package during storage. Based on presented considerations it can be concluded that the higher initial oxygen content in packaging the greater amount of oxygen enters in direct reaction to packaged product, accelerating process of auto oxidation of fat in product. But scope and intensity of these changes are lower in case of products packaged in steel cans.

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The aim of this work was to analyze the main factors influencing the shelf life of peanut products in modified atmosphere packaging (MAP). Roasted and salted peanuts produced by three well-known commercial companies were presented as examples. Different types of packaging (multilayer laminated materials, cans) with different gas mixture composition (0-1% O2, 1-3% O2, 3-6% O2) were compared. The main aim of shelf-life investigation is to ensure consumer acceptance of a product. Factors affecting the shelf life of products in MAP are presented as an integrated pyramid. All elements of this shelf-life pyramid should be analyzed and included during shelf-life investigations. This study indicates that estimation of the shelf life of a food is integrally related to its packaging (e.g., peanuts in MAP); both product conditions and the package as well as gas mixture composition should be considered.