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Molecular identification of common Salmonella serovars using multiplex DNA sensor-based suspension array.

Muhsin Aydin1,2, Jacqueline Carter-Conger3, Ning Gao4

  • 1Molecular Biosciences Program, Arkansas State University, Jonesboro, AR, 72401, USA.

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A new DNA sensor suspension array rapidly identifies eight Salmonella serovars, crucial for food safety. This high-throughput method detects Salmonella at low levels, improving foodborne illness prevention.

Keywords:
Bead suspension arrayFlow cytometryIdentificationSalmonellaSerotyping

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Area of Science:

  • Food Science
  • Microbiology
  • Biotechnology

Background:

  • Salmonella is a major foodborne pathogen causing significant illness, hospitalizations, and deaths.
  • Sensitive and rapid detection assays are critical for ensuring food safety and preventing outbreaks.

Purpose of the Study:

  • To develop a high-throughput, multiplex DNA sensor array for identifying common Salmonella serovars.
  • To achieve sensitive and specific detection of Salmonella at the serotype level.

Main Methods:

  • A DNA sensor suspension array system was created using microspheres with oligonucleotide probes targeting Salmonella virulence and serovar-specific genes.
  • The system employed a 12-plex DNA sensor array platform, multiplex PCR (mPCR) for DNA amplification, and the Bio-Plex® system for signal detection.
  • Hybridization between DNA sensors and fluorescently labeled target DNA determined the presence and serotype of Salmonella.

Main Results:

  • The array detected synthetic DNA at 100 fM and Salmonella at 100 CFU/mL within 1 hour post-PCR.
  • Sensitivity improved to 1 CFU/mL with a 6-hour enrichment step.
  • The system demonstrated high specificity, correctly identifying Salmonella serotypes without cross-reactivity with other foodborne pathogens.

Conclusions:

  • The developed DNA sensor suspension array is a rapid, reliable, and high-throughput method for simultaneous detection and molecular identification of common Salmonella serotypes.
  • This technology offers a significant advancement in food safety by enabling quick and accurate identification of foodborne pathogens.