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Appl Environ Microbiol. 2007 Dec;73(24):8028-31. Epub 2007 Oct 12.

Enumeration of viable Listeria monocytogenes cells by real-time PCR with propidium monoazide and ethidium monoazide in the presence of dead cells.

Author information

  • 1U.S. Department of Agriculture, Agricultural Research Service, and North Carolina Agricultural Research Service, Department of Microbiology, North Carolina State University, Raleigh, NC 27695-7624, USA.

Abstract

Propidium monoazide (PMA) and ethidium monoazide were used for enumeration of viable Listeria monocytogenes cells in the presence of dead cells. PMA had no antimicrobial effect on L. monocytogenes. Viable cell counts were linearly related to real-time PCR threshold cycle values for PMA-treated cells from planktonic and biofilm sources over a 4-log range.

PMID:
17933922
PMCID:
PMC2168130
DOI:
10.1128/AEM.01198-07
[PubMed - indexed for MEDLINE]
Free PMC Article
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