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This study introduces a novel solid-contact ion-selective electrode (ISE) for simultaneously detecting two molecules. This versatile platform offers sensitive and selective detection of targets like pathogenic bacteria DNA.

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Area of Science:

  • Electrochemistry
  • Biosensing
  • Molecular Diagnostics

Background:

  • Conventional ion-selective electrodes (ISEs) are typically designed for single ion determination.
  • Simultaneous detection of multiple analytes often requires complex instrumentation.
  • There is a need for versatile and sensitive platforms for multiplexed molecular detection.

Purpose of the Study:

  • To develop a simple and versatile platform for simultaneous detection of two molecules using a single ISE.
  • To demonstrate the capability of a solid-contact ISE for simultaneous detection of oppositely charged ions.
  • To create a potentiometric genosensor for sensitive and selective detection of pathogenic bacteria.

Main Methods:

  • Utilized periodic galvanostatic polarization of a solid-contact ISE.
  • Integrated biorecognition elements with potentiometric measurements.
  • Developed a magnetic beads-enzyme sandwich assay for DNA detection.

Main Results:

  • Achieved simultaneous detection of two oppositely charged ions with high sensitivity, selectivity, and fast reversibility.
  • Demonstrated sensitive and selective simultaneous detection of Escherichia coli O157:H7 and Staphylococcus aureus DNA using a single ISE.
  • Obtained low detection limits for bacterial DNA: 120 fM for E. coli O157:H7 and 54 fM for S. aureus.

Conclusions:

  • A simple, versatile, and sensitive platform for simultaneous molecular detection using a single solid-contact ISE has been developed.
  • The potentiometric technique offers an attractive tool for multiplexed analyte measurements.
  • This approach holds promise for various applications in diagnostics and molecular sensing.