Journal
INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY
Volume 247, Issue -, Pages 2-8Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijfoodmicro.2016.07.005
Keywords
Mass spectrometry; MALDI-TOF MS; Bacteria identification; Lactic acid bacteria; Cow-milk cheese
Categories
Funding
- French National Research Agency (ANR) within the frame of the 'Future Investments' program [ANR-11-EQPX-0037]
- Nord-Pas-de-Calais Region
- FEDER
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In this study we identified the culturable population of mesophilic lactic acid bacteria (LAB) from a French cheese Maroilles made either with raw or pasteurized milk using MALDI-TOF mass spectrometry (MS). Samples from rind and heart of Maroilles cheese were used, the LAB were selected on MRS agar at 30 degrees C and 197 Gram-positive and catalase-negative strains were subjected to identification by MALDI-TOF MS profiling. All strains were unambiguously identified: 105 strains from Maroilles made with raw milk (38 on the rind and 67 in the heart) and 92 strains from Maroilles made with pasteurized milk (39 on the rind and 53 in the heart). MALDI-TOF MS identification allowed identification of three genera belonging to LAB including Lactobacillus, Enterococcus and Leuconostoc. Lactobacillus was the most represented genus with seven species: Lactobacillus plantarum (L. plantarum), L. paracasei, L. curvatus, L. rhamnosus, L. fnictivorans, L. parabuchneri, L. brevis found in Maroilles made with both kind of milk. The correlation between the 16S rDNA-based identification performed on selected strains and those obtained by MALDI-TOF-MS demonstrates that this fast, economically affordable, robust and reliable method for bacteria characterisation stands as an attractive alternative to the commonly-used methods and its application in food industry is discussed. (C) 2016 Elsevier B.V. All rights reserved.
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