Abstract
Metabolites of phospholipids possess powerful biologic activity towards prokaryotic cells. For instance, they may cause surfactant-induced lysis of cells. Gram-positive bacteria are sensitive to the lyric action of surfactants. In this study we, therefore, investigated the effect of dietary phospholipids on the Gram-positive food-borne pathogen Listeria monocytogenes. Methods: The listericidal effect of lecithin and lysolecithin was tested in vitro by culturing techniques. In addition, male Wistar rats were fed purified diets based on lactase-treated skim milk powder (1.7 lamol phospholipids/g diet) or sweet butter milk powder (10.4 pmol phospholipids/g diet). After adaptation to these diets, animals were orally infected with 4 x 109 CFU Listeria monocytogenes 4B. Results: Lysolecithin, in contrast to lecithin, inhibited growth of Listeria in vitro. Infection parameters in vivo are summarized in the table (* P < 0.05).
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