Effect of various packaging solutions on the quality of hazelnuts in nut–dried fruit mixes
2019
Kirse-Ozolina, A., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Food Technology. Dept. of Food Technology | Muizniece-Brasava, S., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Food Technology. Dept. of Food Technology | Veipa, J., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Food Technology. Dept. of Food Technology
Nut-dried fruit mixes are a nutritious snack, which can be consumed throughout the year. However, moisture migration, which occurs between components with higher moisture content (dried fruit) and lower moisture content (cereals, nuts), can lead to undesirable physical and chemical changes during storage. The aim of this study was to identify optimal packaging solutions for various types of nut and dried fruit mixes in order to maintain the quality of hazelnuts. Experiments were carried out at the laboratories of the Faculty of Food Technology, Latvia University of Life Sciences and Technologies and quality control laboratories of Grindeks JSC. A total of nine packaging conditions were tested: three types of packaging – polyethylene terephthalate/metallised polyethylene terephthalate/low density polyethylene (PET/metPET/LDPE), biodegradable polylactic acid (PLA) and biaxially oriented polypropylene /ethyl vinyl alcohol/low density polyethylene (BOPP/EVOH/LDPE), and three packaging environments – air ambiance, modified atmosphere packaging (30% CO2, 70% N2) and active packaging with oxygen absorbents. The results of moisture content, pH, hardness, colour, water activity and peroxide value testing during 8-month storage showed that the most suitable packaging materials to ensure quality of hazelnuts in nut–dried fruit mixes are biodegradable PLA and BOPP/EVOH/LDPE packaging. With regards to the effect of packaging technologies on product quality, the best results were obtained when modified atmosphere packaging or active packaging was used.
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