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Developing Microelectrode Arrays for the Point-of-Care Multiplex Detection of Metabolites.

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This study introduces a novel surface design for DNA aptamer-functionalized electrode arrays, enabling stable, multiplexed detection of pathogen exometabolites for point-of-care applications.

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Area of Science:

  • Biosensors and Nanotechnology
  • Molecular Diagnostics
  • Surface Chemistry

Background:

  • DNA aptamers offer a promising platform for pathogen detection via exometabolites.
  • Existing aptamer-based methods face limitations in stability and multiplexing capabilities for point-of-care (POC) devices.
  • A need exists for advanced surface designs to enhance aptasensor performance and usability.

Purpose of the Study:

  • To develop a novel surface design for DNA aptamer-functionalized electrode arrays.
  • To overcome limitations of previous aptamer-based pathogen detection methods.
  • To create a stable and multiplex-capable device suitable for POC applications.

Main Methods:

  • Utilized a diblock copolymer coating on a high-density microelectrode array.
  • Employed Copper (Cu)-mediated cross-coupling reactions for selective electrode functionalization.
  • Demonstrated multiplexed detection of small-molecule targets using 960 individually addressable electrodes.

Main Results:

  • Achieved a stable aptasensor device with a shelf life of 1 year.
  • Developed a surface chemistry enabling exclusive functionalization of specific electrodes.
  • Successfully demonstrated multiplexed detection of small molecules, showcasing the array's potential.

Conclusions:

  • The novel surface design significantly advances aptamer-based biosensor technology.
  • The developed electrode arrays are stable, selective, and suitable for multiplexed small-molecule detection.
  • This innovation bridges the gap towards practical, point-of-care pathogen detection devices.