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    Antimicrobial effectiveness of chitosan-essential oil coated plastic films against foodborne pathogens
    (SAGE PUBLICATIONS LTD, 2011) Torlak, Emrah; Nizamlioglu, Mustafa
    In this study, antimicrobial efficacy of polypropylene (PP) films coated with chitosan solutions (2% wt/v) and chitosan solutions enriched with essential oils (EOs) against Listeria monocytogenes, Staphylococcus aureus, and Escherichia coli O157:H7 were evaluated on Kashar cheese slices. Oregano and clove oils were incorporated into film solutions at 1% (v/v). Inoculated cheese samples were wrapped with films and stored at 4 degrees C for 14 days. Antimicrobial effectiveness of films against each of three pathogens was measured by plate counts performed on 1, 7, and 14 days of storage. It was found that the antimicrobial effectiveness of all film types against three pathogens were statistically significant (p < 0.05), with films containing oregano oil showed greater antimicrobial effect on pathogens than films containing clove oil. Results suggest that chitosan is an ideal biopolymer for coating onto PP films, and EOs have the potential to be used in antimicrobial coated plastic film prepared from biopolymers.
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    Effectiveness of edible chitosan films containing essential oils on staphylococcus aureus and escherichia coli o157:h7
    (KAFKAS UNIV, VETERINER FAKULTESI DERGISI, 2011) Torlak, Emrah; Nizamlioglu, Mustafa
    In this study antimicrobial efficacy of edible films prepared with chitosan solution and chitosan solutions containing essential oils against Staphylococcus aureus and Escherichia coli O157:H7 were evaluated on kashar cheese. Oregano and clove oils were added to edible film solutions at 0.5% and 1%. Kashar cheese samples were contaminated with S. aureus and E. coli O157:H7 at 5 Log cfu/g. Artificially contaminated cheese samples were wrapped with prepared films and stored at 4 degrees C for 14 days. Antimicrobial effectiveness of films against S. aureus and E. coli O157: H7 were evaluated by counts performed on 1, 7 and 14 days of storage period. At the end of storage period antimicrobial effectiveness of all film types against both pathogens were determined as significant (P<0.05). Applications of edible films to samples were resulted 0.90 to 2.66 Log reduction in count of S. aureus and 0.75 to 2.32 Log reduction in count of E. coli O157: H7 compared to control samples.