Biopolimerni kompozitni filmi na osnovi hidroksipropil metilceluloze in pektina, ojačani z nano oksidnimi delci magnezijevega in cinkovega oksida kot prevleka za zaščito jagod
Résumé
Biopolymers have been widely investigated as an alternative to synthetic plastics. Perishable foods such as fruits and vegetable products have a short shelf life and cause significant postharvest losses, posing a major challenge to the food supply chain. In this research, hydroxypropyl methylcellulose (HPMC)/pectin composite reinforced with 0.5 % magnesium oxide nanoparticles (MgO NPs) and 0.5 % zinc oxide nanoparticles (ZnO NPs) was investigated. The purpose of developing these materials is to improve the mechanical and barrier properties of biopolymer composite films and consider them as an alternative to synthetic plastics of fossil origin. The aim of this study was to create and characterize novel eco-friendly biopolymer composite films for the preservation of strawberries. However, strawberries are highly perishable and susceptible to physical and microbial deterioration after harvest. Their shelf life was extended using a nanocomposite coating based on an HPMC/pectin biopolymer matrix reinforced with MgO and ZnO nanoparticles. Coated and uncoated strawberries were monitored for 10 days at 20 °C. The HPMC/pectin/NPs coating acted as a physical barrier, reducing respiration rate, weight loss, and preserving the good shape of strawberries (Fragaria vesca) compared to uncoated fruits during storage. In addition, the results showed that nanocomposite films prepared from HPMC/pectin/NPs provided excellent bacterial inhibition against Escherichia coli and Staphylococcus aureus, making them suitable for food packaging. Moreover, the addition of MgO and ZnO NPs significantly increased the flexibility and plasticity of the nanocomposite films compared to HPMC/pectin films alone. In short, the use of an active nanocomposite coating of HPMC/pectin/MgO NPs and/or ZnO NPs can be considered an effective method to protect strawberries from physical and biological damage during storage and transportation.
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