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http://dx.doi.org/10.14480/JM.2022.20.2.78

Effect of control measures on the contamination and growth inhibition of Listeria monocytogenes in Flammulina velutipes  

Lee, Ha Kyoung (Department of Food and Nutrition, Kyung Hee University)
Jeon, Ji Hye (Department of Food and Nutrition, Kyung Hee University)
Lee, Ji Soo (Department of Food and Nutrition, Kyung Hee University)
Yoon, Seo Young (Department of Food and Nutrition, Kyung Hee University)
Kim, Won Young (Honam Mushroom Agricultural Association)
Yoon, Ki Sun (Department of Food and Nutrition, Kyung Hee University)
Publication Information
Journal of Mushroom / v.20, no.2, 2022 , pp. 78-85 More about this Journal
Abstract
The consumption of Flammulina velutipes mushroom imported from Korea has been associated with the cases of listeriosis in the United States, Canada, and Australia. We investigated the effect of sanitizing the plastic wrapper (used in packaging F. velutipes) with slightly acidic electrolyzed water (SAEW) and ultraviolet C waterproof light-emitting diode (UVC-W-LED) on reducing the Listeria monocytogenes. Further, the effect of UVC-LED on L. monocytogenes growth in F. velutipes at different storage temperatures (2, 4, and 10℃) was determined. The combined (SAEW+UVC-W-LED) treatment for 5-10 min reduced 99.9% of bacterial population from the contaminated plastic wrapper. In addition, the UVC-LED treatment for 3 min reduced the L. monocytogenes concentration in F. velutipes by 0.47 log CFU/g. Moreover, the growth of L. monocytogenes in the treated mushrooms was slower than that of the untreated (control) ones. L. monocytogenes concentration in F. velutipes increased over 3 log CFU/g at 2℃ and 10℃ for 60 and 10 days, respectively. The growth of L. monocytogenes at the bottom of mushrooms was faster than that at the top at both the temperatures. These results indicate that the combined SAEW+UVC-W-LED treatment of plastic wrappers and the UVC-LED treatment of mushrooms can be used as potential hurdle technologies to control the risk of L. monocytogenes in mushrooms prior to packaging at farms.
Keywords
Flammulina velutipes; Hurdle technology; Listeria monocytogenes; Plastic wrapper;
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