83B-16 |
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D. S. AN1, H. J. Park2, C. H. Lee1, and D. S. Lee1. (1) Division of Food Science and Biotechnology, Kyungnam University, 449 Wolyoung-dong, Masan, 631-701, South Korea, (2) Graduate School of Biotechnology, Korea University, 1, 5-ka, Anam-dong, Sungbuk-ku, Seoul, 136-701, South Korea Recently antimicrobial packaging incorporating preservative has been proposed and shown to have potential of inhibiting microbial growth on food contact surfaces and improving the preservation of foods. However, quantitative information on the effect of antimicrobial packaging is very scarce and limited, and microbial growth kinetics on foods affected by antimicrobial packaging has not been studied. Therefore, this study examined the influence of antimicrobial packaging with reference to microbial growth kinetics on foods. The influence of antimicrobial packaging on the growth of aerobic bacteria and yeasts in pasteurised milk and orange juice in contact with paperboard coated with nisin and/or chitosan in a binder of vinyl acetate ethylene copolymer was measured at 3, 10 and 20oC. Paperboard coated only with plain binder was used as a control. The effect of antimicrobial packaging on the microbial growth was analyzed by using Baranyi's growth model. The paperboard coated with nisin and/or chitosan significantly improved the microbial stability of milk and orange juice at 3 and 10oC, but not so noticeably at 20oC. Of those tested, paperboards that included a combination of nisin and chitosan in the coating gave the highest microbial inhibition, and this was most apparent at 10oC. The effectiveness of antimicrobial paperboard in suppressing the microbial growth was indicated by low maximum temperature, extended lag time and reduced specific growth rate. Analysis by Ratkowsky equations showed that foods in contact with antimicrobial paperboards showed higher minimum growth temperature and greater temperature dependence than did foods in contact with plain paper. The microbial storage stability and shelf life of perishable foods packaged by antimicrobial packaging can be estimated quantitatively as function of temperature.
Session 83B, Food Packaging: Applications of edible coatings, antimicrobial films, and sensors in food packaging
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