4.7 Article

Development of Low-Density Polyethylene Films Coated with Phenolic Substances for Prolonged Bioactivity

Journal

POLYMERS
Volume 15, Issue 23, Pages -

Publisher

MDPI
DOI: 10.3390/polym15234580

Keywords

LDPE; carvacrol; thymol; olive-leaf extract; antimicrobial; antioxidant; active packaging

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This study proposes an efficient coating methodology for LDPE films used in food packaging applications by incorporating natural phenolic-based substances. The coated films showed significantly inhibited growth of Escherichia coli, excellent antioxidant activities, and maintained mechanical performance.
The current study proposes an efficient coating methodology for the development of low-density polyethylene (LDPE) films with prolonged bioactivity for food packaging applications. Three natural phenolic-based substances were incorporated at optimized concentrations in methyl-cellulose-based solutions and used as coatings on LDPE films. The amount of surfactant/emulsifier was optimized to control the entrapment of the bioactive substances, minimizing the loss of the substances during processing, and offering prolonged bioactivity. As a result, the growth of Escherichia coli was substantially inhibited after interaction with the coated films, while coated films presented excellent antioxidant activities and maintained their mechanical performance after coating. Considerable bioactivity was observed after up to 7 days of storage in sealed bags in the case of carvacrol- and thymol-coated films. Interestingly, films coated with olive-leaf extract maintained a high level of antimicrobial and antioxidant properties, at least for 40 days of storage.

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