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KMID : 0545120070170081284
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Journal of Microbiology and Biotechnology
2007 Volume.17 No. 8 p.1284 ~ p.1290
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Shelf-Life Extension of Fresh-Cut Iceberg Lettuce (Lactuca sativa L) by Different Antimicrobial Films
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Kang Sun-Chul
Kim Min-Jeong
Choi Ung-Kyu
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Abstract
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This study was conducted to investigate the antibacterial activity and shelf-life extension effect of iceberg lettuce packed in BN/PE film. The BN/PE film has a strong microbial suppression effect on pathogenic bacteria such as Escherichia coli, Salmonella enteritidis, and S. typhimurium. The number of psychrophiles and mesophiles during 5 days of cold storage of fresh-cut iceberg lettuce at 10oC packaged in BN/PE film was strictly suppressed in comparison with other tested films (OPP, PE, and PET film). When fresh processed iceberg lettuce was processed and stored under the current conditions, the shelf-life of the product was longer than 5 days in the BN/PE film package, whereas the shelf-life when using the other films tested, PE, OPP and PET, was no longer than 3-4 days. The decay rates of the iceberg lettuce packed in the BN/PE film was maintained at 29.8±2.1% on the 5th day of preservation. The samples packed in BN/PE film maintained an excellent visual quality during the 3 days of storage without significant differences in comparison with the initial visual quality. No browning was observed in the samples packed in BN/PE film for up to 3 days. The texture of shredded iceberg lettuce packaged in BN/PE film remained unchanged up to 3 days, and then a moderate decrease in texture was observed after 4 days of storage. In addition, the overall acceptability of fresh-cut iceberg lettuce packaged in BN/PE film did not change for up to 3 days, whereas the samples packaged in the other films were inedible by 3 days of storage. In conclusion, the shelf-life of fresh-cut iceberg lettuce packaged in the BN/PE film was extended to more than 5 days at 10oC, whereas that in the other films was 2 days at 10oC. Therefore, the shelf-life extension effect of the freshcut iceberg lettuce in BN/PE film packaging was very effective compared with the other films tested.
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KEYWORD
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Shelf-life extension, iceberg lettuce, BN/PE film, microbial suppression effect
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