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Gantzias, Charalampos; Lappa, Iliada K.; Aerts, Maarten; Georgalaki, Marina; Manolopoulou, Eugenia; Papadimitriou, Kostas; De Brandt, Evie; Tsakalidou, Effie; Vandamme, Peter
International journal of food microbiology, 06/2020, Volume: 323Journal Article
Matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry (MS), a culture based alternative for microbial diversity studies, is an attractive tool to dereplicate large numbers of isolates to a smaller set of representatives for downstream characterization. In the present study, MALDI-TOF MS, combined with a database of reference spectra compiled in previous studies, was applied to identify 88 non-starter lactic acid bacteria (NSLAB) isolated from 18 samples of four different artisanal cheeses produced in the Island of Naxos, Greece, from raw sheep and goat milk without the addition of starters. Eighty-four isolates (95.5%) could be identified directly via MALDI-TOF MS. Lactobacillus brevis and Lactobacillus plantarum were the dominant species, followed by Lactococcus lactis, Leuconostoc mesenteroides Lactobacillus paracasei, Lactobacillus rhamnosus, Pediococcus pentosaceus and Enterococcus faecium. The remaining four isolates represented species present in the database; however, within-species diversity was insufficiently covered. Additionally, pheS sequencing was applied to confirm identification. •Application of MALDI-TOF MS for the identification of lactic acid bacteria•First fingerprinting of the non-starter lactic acid bacteria of artisanal cheeses produced in the Island of Naxos, Greece•PheS sequencing was performed to validate MALDI-TOF MS identication
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