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Sample-to-answer acoustic detection of DNA in complex samples.

George Papadakis1, Pasquale Palladino1, Dimitra Chronaki2

  • 1Institute of Molecular Biology and Biotechnology-FORTH, 100 N. Plastira Str, Heraklion, 70013, Greece. gizeli@imbb.forth.gr.

Chemical Communications (Cambridge, England)
|July 4, 2017
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Summary

This study presents a sensitive, label-free acoustic method for detecting Salmonella DNA directly from whole bacterial cells without purification. The assay works in milk, offering a rapid sample-to-answer solution.

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Area of Science:

  • Biosensing
  • Molecular Diagnostics
  • Food Safety

Background:

  • Accurate detection of Salmonella Typhimurium is crucial for public health and food safety.
  • Current methods often require extensive sample preparation, increasing time and cost.
  • Developing rapid, sensitive, and simplified detection assays remains a priority.

Purpose of the Study:

  • To develop a sensitive and label-free acoustic biosensor for detecting DNA amplicons from whole Salmonella Typhimurium cells.
  • To demonstrate the feasibility of this assay without DNA extraction or purification steps.
  • To validate the assay's performance in a complex matrix like milk, enabling a sample-to-answer approach.

Main Methods:

  • Utilized acoustic detection of double-stranded DNA (dsDNA) amplicons.
  • Performed detection directly from lysed whole Salmonella Typhimurium cells, bypassing DNA extraction/purification.
  • Implemented a hybridization-free assay format.
  • Tested the assay's capability in raw milk samples.

Main Results:

  • Achieved sensitive and label-free acoustic detection of dsDNA amplicons.
  • Demonstrated successful detection in the presence of lysed bacterial cells.
  • Confirmed the assay's functionality without requiring a hybridization step.
  • Showcased a sample-to-answer DNA detection assay directly in milk.

Conclusions:

  • The developed acoustic biosensor offers a sensitive and label-free method for Salmonella Typhimurium detection.
  • Eliminating DNA extraction and purification steps significantly simplifies the diagnostic workflow.
  • The assay's performance in milk highlights its potential for rapid, on-site food safety monitoring.