An 8-hour system for Salmonella detection with immunomagnetic separation and homogeneous time-resolved fluorescence PCR

Int J Food Microbiol. 2008 Jul 15;125(2):158-61. doi: 10.1016/j.ijfoodmicro.2008.03.037. Epub 2008 Apr 4.

Abstract

We describe a system consisting of rapid sample enrichment and homogeneous end-point PCR analysis that enables the detection of Salmonella in various food matrices in 8 h. Sample preparation starts with 6 h enrichment step in supplemented broth, after which Salmonella cells are collected with immunomagnetic particles. The particles are washed and dispensed to ready-to-use PCR reaction vessels, which contain dried assay-specific reagents and an internal amplification control. PCR is performed with a novel instrument platform utilising the sensitive label technology of time-resolved fluorometry. Qualitative assay results are automatically interpreted and available in 45 min after sample addition. The overall accuracy, sensitivity and specificity of the Magda CA Salmonella system were 99.1%, 98.4% and 100.0%, respectively, based on the evaluation of 107 samples (beef, pork, poultry and ready-to-eat meals) artificially contaminated with sub-lethally injured Salmonella cells.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Automation
  • Fluorescence
  • Fluorometry / methods*
  • Fluorometry / standards
  • Food Contamination / analysis*
  • Gene Amplification
  • Immunomagnetic Separation / methods*
  • Immunomagnetic Separation / standards
  • Polymerase Chain Reaction / instrumentation
  • Polymerase Chain Reaction / methods*
  • Polymerase Chain Reaction / standards
  • Salmonella / classification
  • Salmonella / immunology
  • Salmonella / isolation & purification*
  • Sensitivity and Specificity
  • Species Specificity
  • Time Factors