Inhibition of Listeria monocytogenes, Escherichia coli O157:H7, and Micrococcus luteus by Linear Furanocoumarins in a Model Food System
Lime peel, parsnip, lemon peel, dried parsley flakes, cold-pressed lime oil, and distilled lime oil samples were analyzed for the presence and concentration of the linear furanocoumarins (LFs) psoralen, 5-methoxypsoralen (5-MOP), and 8-methoxypsoralen (8-MOP) by thin layer chromatography
and gas chromatography mass spectrometry. Cold-pressed lime oil had the highest LF content (psoralen, 67 ± 29 μg/ml, 5-MOP, 1,634 ± 62 μg/ml, and 8-MOP, 44 ± 2 μg/ml). The antimicrobial effectiveness of LFs against Listeria monocytogenes, Escherichia coli
O157:H7, and Micrococcus luteus was tested in a model food system consisting of a slurry of 25% commercial "garden vegetables" baby food in 0.1% peptone water. Inhibition required UV activation after the addition of the LFs to the model system. Lime peel extract, cold-pressed lime oil,
and a 5-MOP standard inhibited the growth of L. monocytogenes, but not E. coli O157:H7. M. luteus was inhibited only by the cold-pressed lime oil. The minimum LF concentration that caused inhibition of the growth of L. monocytogenes was 32 μg/g and the minimum
bactericidal concentration was 43 μg/g. Cold-pressed lime oil inhibited L. monocytogenes even at the lowest concentration added to the model system (10 μg/g), while the corresponding LF standard did not. This suggested the presence of other antimicrobial agents in the oil.
MODEL FOOD SYSTEM;
Document Type: Research Article
Department of Food Science and Nutrition, University of Minnesota, 1334 Eckles Avenue, St. Paul, Minnesota 55108, USA; General Mills, Inc., James Ford Bell Technical Center, 9000 Plymouth Avenue North, Minneapolis, MN 55427,
Department of Food Science and Nutrition, University of Minnesota, 1334 Eckles Avenue, St. Paul, Minnesota 55108, USA
Department of Food Science and Nutrition, University of Minnesota, 1334 Eckles Avenue, St. Paul, Minnesota 55108, USA; Department of Food Science and Toxicology, University of Idaho, Moscow, ID 83844, USA
Publication date: September 1, 1997
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