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Applied and Environmental Microbiology, June 2005, p. 3049-3059, Vol. 71, No. 6
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.6.3049-3059.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Rapid Differentiation and In Situ Detection of 16 Sourdough Lactobacillus Species by Multiplex PCR

Dipartimento di Scienze degli Alimenti, Sezione di Tecnologie e Biotecnologie degli Alimenti, Università degli Studi di Perugia, Perugia, Italy,¹ Dipartimento di Scienze degli Alimenti, Università degli Studi di Teramo, Teramo, Italy,² Alimentary Pharmabiotic Centre and Department of Microbiology, University College Cork, Cork, Ireland³

Received 16 July 2004/ Accepted 3 January 2005

A two-step multiplex PCR-based method was designed for the rapid detection of 16 species of lactobacilli known to be commonly present in sourdough. The first step of multiplex PCR was developed with a mixture of group-specific primers, while the second step included three multiplex PCR assays with a mixture of species-specific primers. Primers were derived from sequences that specify the 16S rRNA, the 16S-23S rRNA intergenic spacer region, and part of the 23S rRNA gene. The primer pairs designed were shown to exclusively amplify the targeted rrn operon fragment of the corresponding species. Due to the reliability of simultaneously identifying Lactobacillus plantarum, Lactobacillus pentosus, and Lactobacillus paraplantarum, a previously described multiplex PCR method employing recA gene-derived primers was included in the multiplex PCR system. The combination of a newly developed, quick bacterial DNA extraction method from sourdough and this multiplex PCR assay allows the rapid in situ detection of several sourdough-associated lactobacilli, including the recently described species Lactobacillus rossii, and thus represents a very useful alternative to culture-based methodologies.

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