Evaluation of quality attributes of grated carrot packaged within polypropylene-clay nanocomposites
2021
Ghorbani, Zahra | Zamindar, Nafiseh | Baghersad, Safiyeh | Paidari, Saeed | Jafari, Seid Mahdi | Khazdooz, Leila
The current study aimed to investigate the protection role of nanocomposite polypropylene films containing clay nanoparticles (NPs) on grated carrot. The effects of clay NPs (1 and 3%) were studied during storage (1, 3, 6, 9 and 12 days) in a completely randomized design. All samples were stored at 4 ± 1 °C. The chemical characteristics, color (L*, b* and a* values), sugars content (glucose, fructose and sucrose), total phenolic content and sensory qualities of packaged carrot were measured. Moreover, microbial counts namely E. coli, molds, yeasts, psychotropic bacteria as well as total count were determined. According to the results, application of clay NPs significantly (P < 0.01) reduced the pH, color indices as well as acidity. Nanocomposites with 3% NPs showed the highest total phenolic content (P < 0.01). Clay NPs also could significantly (P < 0.01) prevent the reduction of glucose in all samples. According to the microbial results, yeasts, molds and psychotropic bacteria were reduced during the 12 day storage. Therefore, it could be concluded that a decontamination step followed by packaging in nanocomposites can remarkably preserve the physicochemical and microbial characteristics as well as sensory quality of grated carrots during storage.
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