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Inactivation of Listeria monocytogenes by Ultraviolet Energy
Author(s) -
YOUSEF A.HMED E.,
MARTH E.LMER H.
Publication year - 1988
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1988.tb07759.x
Subject(s) - listeria monocytogenes , listeria , irradiation , ultraviolet irradiation , agar , chemistry , food science , ultraviolet , population , microbiology and biotechnology , inoculation , biology , bacteria , materials science , immunology , medicine , physics , genetics , optoelectronics , environmental health , nuclear physics
Short‐wave UV‐energy (100 μW/cm 2 ) 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/cm 2 ) 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.