Preparation and Antibacterial Properties of KGM/PEC/&#x003b5;-PL Composite Films

YUAN Zhixin; LUO Man; HUANG Shaoyun; LI Jinli

doi:10.19554/j.cnki.1001-3563.2025.13.013

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Packaging Engineering ›› 2025, Vol. 46 ›› Issue (13) : 114-121. DOI: 10.19554/j.cnki.1001-3563.2025.13.013

Advanced Materials

Preparation and Antibacterial Properties of KGM/PEC/ε-PL Composite Films

YUAN Zhixin^1,2, LUO Man¹, HUANG Shaoyun¹, LI Jinli^1,2,*

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Abstract

Freshly cut meat is susceptible to bacterial contamination and spoilage during storage. Biodegradable composite films can form an air barrier on the surface of the meat surface to extend the shelf life. However, current biodegradable composite films hardly meet the antibacterial requirements of meat products. To address this problem, a biodegradable antimicrobial composite film was prepared with edible konjac glucomannan (KGM) and pectin (PEC) as film-forming substrates, and glycerol (GL) and ε-polylysine (ε-PL) as antimicrobial agents. Experiment results showed that the surface of the prepared KGM/PEC composite film was uniform and smooth. The results of one-way and orthogonal experiments indicated that the mechanical properties of the composite film were optimal when the mass fractions of KGM, PEC and GL were 0.8%, 0.9%, and 0.4%, respectively. When the ε-PL mass fraction was controlled from 0.5% to 1.5%, the antibacterial effect of the composite film improved with the increasing mass fraction of ε-PL, demonstrating better antibacterial effect against Escherichia coli and Staphylococcus aureus, and its wrapped pork samples showed minimal changes in color difference and pH. The pork shelf life was extended by 2 days. In conclusion, the developed antimicrobial composite film is degradable, biocompatible, simple to operate, and suitable for diverse applications. It is expected to become a new material for food with great application value.

Key words

konjac glucan / pectin / ε-polylysine / mechanical properties / antimicrobial properties / freshness preservation

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YUAN Zhixin, LUO Man, HUANG Shaoyun, LI Jinli. Preparation and Antibacterial Properties of KGM/PEC/ε-PL Composite Films[J]. Packaging Engineering. 2025, 46(13): 114-121 https://doi.org/10.19554/j.cnki.1001-3563.2025.13.013

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