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KMID : 1134820120410071009
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Journal of the Korean Society of Food Science and Nutrition
2012 Volume.41 No. 7 p.1009 ~ p.1013
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Effects of Opuntia ficus indica Extracts on Inactivation of Escherichia coli O157:H7 and Listeria monocytogenes on Fresh-cut Apples
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Seo Young-Ho
Han Chang-Ho
Lee Jeong-Mi
Choi Sung-Min
Moon Kwang-Deog
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Abstract
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We investigated the antibacterial effects of Opuntia ficus indica extracts on foodborne pathogens, Escherichia coli O157:H7 and Listeria monocytogenes, on the medium of sliced apples. Pathogens were inoculated on sliced apples and immersed for 10 min in Opuntia ficus indica extracts. Each sample was packaged and stored at 4oC and 21oC for 8 days. The populations of E. coli O157:H7 and L. monocytogenes significantly decreased with increasing extract concentration (p<0.05). In particular, L. monocytogenes was reduced to non-detectable levels after 2 days in 50 mg/mL treatment at 4oC and 21oC Opuntia ficus indica extracts therefore have antibacterial effects on the two foodborne pathogens. Sensory evaluation results indicated that treated apples had better sensory characteristics than did the control. Therefore, the results suggest that Opuntia ficus indica extracts could be useful as a natural food preservative to improve microbial safety.
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KEYWORD
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Opuntia ficus indica, fresh-cut, apple, Escherichia coli O157:H7, Listeria monocytogenes
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