To develop a packaging film for 'Maehyang' strawberries, an edible film containing antimicrobial grapefruit seed extract (GSE) was manufactured. Addition of GSE to the rapeseed protein-gelatin (RG) film inhibited the growth of pathogenic bacteria such as Escherichia coli O157:H7 and Listeria monocytogenes. Packaging of 'Maehyang' strawberries with the RG film containing 1.0% GSE decreased the populations of total aerobic bacteria and of yeast and moulds in the strawberries by 1.03 and 1.34 log CFU g )1 , respectively, after 14 days of storage, compared to that of the control. Sensory evaluation of the GSE-RG film-packaged strawberries produced better sensory scores than did the control. These results suggest that RG film containing GSE can be used to package strawberries and to extend shelf life.
In this study, we aimed to improve the physical properties of Gelidium corneum-gelatin (GCG) film by including nano-clay in the film-forming solution and tested the antimicrobial properties of the thymolcontaining composite film as a packaging material for chicken breast. Addition of nano-clay improved the physical properties of GCG film. The tensile strength of the GCG film containing 1% Cloisite Na + was 38.13 MPa, compared to the 26.65 MPa for the GCG film. The water vapour permeability of the GCG film was 3.56 ng m m )2 sPa, while that of the GCG film with 1% Cloisite Na + was 3.24 ng m m )2 sPa. Incorporation of thymol into the film had its antimicrobial activities against Escherichia coli O157:H7 and Listeria monocytogenes. When used to pack chicken breast, the GCG ⁄ nano-clay film containing thymol inhibited microbial growth during storage.
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