[논문]Inhibition of Listeria monocytogenes using biofilms of non-pathogenic soil bacteria (Streptomyces spp.) on stainless steel under desiccated condition

Kim, Yoonbin; Kim, Hoikyung; Beuchat, Larry R.; Ryu, Jee-Hoon

doi:10.1016/j.fm.2018.11.007

Inhibition of Listeria monocytogenes using biofilms of non-pathogenic soil bacteria (Streptomyces spp.) on stainless steel under desiccated condition

Food microbiology, v.79, 2019년, pp.61 - 65

Kim, Yoonbin (Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University) , Kim, Hoikyung (Department of Food and Nutrition, Wonkwang University) , Beuchat, Larry R. (Center for Food Safety and Department of Food Science and Technology, University of Georgia) , Ryu, Jee-Hoon (Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University)

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Abstract Of the 1648 microbial isolates from 133 soil samples collected from 30 diverse locations in the Republic of Korea, two isolates exhibited strong antilisterial activity and ability to grow to high populations (>8.0 log CFU/ml) in Bennett's broth. Isolates were identified as Streptomyces lactacystinicus (strain Samnamu 5–15) and Streptomyces purpureus (strain Chamnamu-sup 4–15). Both isolates formed biofilms on the surface of stainless steel coupons (SSCs) immersed in Bennett's broth within 24 h at 25 °C. Cells retained antilisterial activity after biofilm formation and showed significantly (P ≤ 0.05) enhanced resistance against dry conditions (43% relative humidity [RH]) compared to the cells not in biofilm. An initial population (ca. 3.2 log CFU/cm2) of Listeria monocytogenes inoculated on SSCs lacking Streptomyces biofilm decreased to 1.4 log CFU/cm2 within 48 h at 25 °C and 43% RH. In contrast, L. monocytogenes (3.3 log CFU/cm2) inoculated on SSCs containing Streptomyces biofilm decreased to populations below the theoretical detection limit (0.5 log CFU/cm2) within 24 h. The results indicate that biofilms formed by the Streptomyces spp. inhibitory to L. monocytogenes showed enhanced resistance to desiccation condition (43% RH) and effectively inhibited the growth of L. monocytogenes on the surfaces of SSCs. Antilisterial biofilms developed in this study may be applicable on desiccated environmental surfaces in food related environments such as food storage, handling, and processing facilities to enhance the microbiological safety of foods. Highlights Antilisterial biofilms of two Streptomyces strains were developed on stainless steel. Two Streptomyces spp. inhibitory to L. monocytogenes were isolated and identified. Two selected Streptomyces strains formed biofilms on stainless steel at 25 °C in 24 h. Selected Streptomyces strains in biofilm showed enhanced resistance to desiccation. The biofilms developed on stainless steel inhibited five strains of L. monocytogenes.

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Inhibition of Listeria monocytogenes using biofilms of non-pathogenic soil bacteria (Streptomyces spp.) on stainless steel under desiccated condition

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Inhibition of Listeria monocytogenes using biofilms of non-pathogenic soil bacteria (Streptomyces spp.) on stainless steel under desiccated condition

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