4.7 Article

Novel ?all-in-one? multifunctional gelatin-based film for beef freshness maintaining and monitoring

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FOOD CHEMISTRY
卷 418, 期 -, 页码 -

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ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2023.136003

关键词

Multifunctional food packaging film; Oregano essential oil Pickering emulsions; Alizarin; Beef freshness maintaining and monitoring

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A novel multifunctional food packaging film containing alizarin and oregano essential oil Pickering emulsion was developed, which exhibited improved UV-vis resistance, mechanical properties, antioxidant and antimicrobial capacity. It effectively slowed down beef spoilage rate and provided real-time visual monitoring of freshness through color changes.
In this study, a novel multifunctional food packaging was developed by incorporating alizarin (AL) and oregano essential oil Pickering emulsion (OEOP) into a gelatin film matrix. The incorporation of OEOP and alizarin improved the UV-vis resistance property of the film, blocking almost all UV-vis light (decreasing 71.80% to 0.06% at 400 nm). The elongation-at-break (EBA) was 4.02 times of that of gelatin film, indicating the improved mechanical properties of the films. This film showed a significant color change from yellow to purple in the pH range of 3-11 and a considerable sensitivity to ammonia vapor within 4 min, which was attributed to the deprotonation of the alizarin molecule. The film's antioxidant and dynamic antimicrobial capacity was signifi-cantly improved owing to the sustained release effect of OEOP. Furthermore, the multifunctional film effectively slowed down the beef spoilage rate and provided real-time visual monitoring of freshness through color changes. Additionally, the color change of the beef quality was linked to the RGB values of the film through a smartphone APP. Overall, this work broadens the possibilities of applications in the food packaging industry for multi-functional food packaging film with preservation and monitoring functions.

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