Inactivation of Listeria monocytogenes by Ultraviolet Energy |
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| Authors: | A.HMED E. YOUSEF E.LMER H. MARTH |
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| Affiliation: | Authors Yousef and Marth are with the Dept. of Food Science and the Food Research institute, Univ. of Wisconsin-Madison, 1605 Linden Drive (Babcock Hall), Madison, Wl 53706. |
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| Abstract: | ![]()
Short-wave UV-energy (100 μW/cm2) decreased the number of Listeria monocytogenes on Tryptose Agar (TA) ca. seven orders of magnitude in 4 min. Age of culture (48 vs 24 hr) did not alter the sensitivity of Listeria to this UV treatment. Increasing the intensity of irradiation (550 vs 100 μW/cm2) increased the rate at which L. monocytogenes was inactivated. Dry rather than moist cells of L. monocytogenes were most resistant to irradiation. In general, inactivation of Listeria with short-wave UV-energy yielded sigmoidal survivor curves. The population of Listeria on TA plates was not affected with long-wave UV-irradiation. |
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