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Antilisterial activity of lactose monolaurate in milk, drinkable yogurt and cottage cheese
- Chen, Y., Nummer, B., Walsh, M.K.
- Letters in applied microbiology 2014 v.58 no.2 pp. 156-162
- Listeria monocytogenes, cottage cheese, culture media, dodecanoic acid, growth retardation, lactose, milk, yogurt
- Lactose monolaurate (LML) was previously found to be an antimicrobial against Listeria monocytogenes in culture medium at concentrations between 3 and 5 mg ml⁻¹. In this study, the microbial inhibitory activity of LML in dairy products inoculated with a 5‐strain cocktail of clinical isolates of L. monocytogenes was investigated. Addition of LML at a concentration of 5 mg ml⁻¹resulted in 4·4, 4·0 and 4·2 log reductions in 0·5% fat, 1% fat and 3·25% fat milks, respectively; 4·1, 4·4, and 3·5 log reductions in nonfat, 1% fat, and 1·5% fat yogurts, respectively; and 4·0 log reductions in both nonfat and 2% fat cottage cheese. The inhibitory effect of LML was only observed at 37°C and not 5°C. Experiments suggest that both the lauric acid and the esterified lactose moiety of LML play roles in the growth inhibition. SIGNIFICANCE AND IMPACT OF THE STUDY: A novel sugar ester, lactose monolaurate, inhibited the growth of a five‐strain cocktail of Listeria monocytogenes in milk, yogurt and cottage cheese. This is the first report of the use of a sugar ester to inhibit the growth of Listeria in food systems.