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چکیده
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Food safety and food loss are major concerns for food manufactures and according to the FAO estimations about 1.3 billion tons of food wastes, which is about one third of food products (1). Microbial contamination is a serious problem which can be controlled by active packaging (2). The application of metal-organic frameworks (MOFs) in food packaging is a very new and recent technology which can improve the food quality (3-5). In this study the carboxymethyl cellulose (CMC) based films loaded Zn-MOF (1-3%) added cinnamon essential (CEO) oil were fabricated successfully. Material and Methods: The films were prepared by casting methods, and tested for FTIR, water barrier properties, antioxidant and antimicrobial properties. Results: The FTIR spectra indicated new interactions between polymer matrix and MOF. The water barrier properties of films were measured via contact angle and water absorbance tests, which improved after addition of Zn-MOF, and increasing its concentration. The films indicated superior antioxidant effects, especially at the highest concentration of MOF, which attributed to the absorbing of CEO into the MOF structure and its controlled release. The antimicrobial properties were studied via disc diffusion method against penicillium digitatum, which the best results were seen for 3% Zn-MOF. Application of Zn-MOF successfully increased bread shelf life from 3 to 12 days, which associated to the controlled release of CEO over the storage time. Conclusion: Finally, this type of packaging can improve the quality of bread by increasing its shelf life. The mechanism of using MOF loaded CEO was attributed the absorbance of CEO into the Zn-MOF, which maintained higher concentrations of bioactive compounds over the storage time of food product.
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