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Related Concept Videos

Microbial Biosensors01:17

Microbial Biosensors

Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...

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Updated: May 16, 2026

Microfluidic On-chip Capture-cycloaddition Reaction to Reversibly Immobilize Small Molecules or Multi-component Structures for Biosensor Applications
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Published on: September 23, 2013

Dual-Channel Interdigitated Aptamer-Based Sensors for Rapid Small-Molecule Detection in Biofluids.

Senyao Wang1,2, Ali Elmorsy2, Defne Tüzün1

  • 1Neuroelectronics, Munich Institute of Biomedical Engineering, Department of Electrical Engineering, TUM School of Computation, Information and Technology, Technical University of Munich, Garching, Germany.

Angewandte Chemie (International Ed. in English)
|May 14, 2026
PubMed
Summary

This study presents a novel electrochemical aptasensor for rapid, point-of-care detection of small molecules in biofluids. The dual-channel system enhances sensitivity and accuracy for diagnostics.

Keywords:
DNA aptamerbiofluid analysiscortisoldopaminepoint‐of‐care diagnostics

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Biosensors

Background:

  • Accurate quantification of small-molecule biomarkers is crucial for point-of-care (POC) diagnostics.
  • Detecting these biomarkers reliably in complex biofluids presents significant challenges for existing methods.

Purpose of the Study:

  • To develop an engineered electrochemical aptasensor platform for sensitive and rapid quantification of small-molecule biomarkers.
  • To overcome limitations in current biofluid biomarker detection using a novel dual-channel signal conversion strategy.

Main Methods:

  • Utilized an electrochemical aptasensor with spatially separated interdigitated electrodes.
  • Implemented selective self-assembled monolayer (SAM) removal for target-induced release and recapture of methylene blue-labeled DNA probes.
  • Employed a dual-channel signal transduction mechanism to enhance detection robustness.

Main Results:

  • Achieved rapid detection (≤ 30 minutes) of small molecules like dopamine and cortisol in various biofluids (aCSF, serum, saliva) using a low sample volume (30 µL).
  • Demonstrated minimized background interference and enhanced mass transport through the dual-channel configuration.
  • Validated the signal conversion mechanism's effectiveness across different targets and sample types with minimal sequence adaptation.

Conclusions:

  • The developed aptasensor platform offers a versatile electrochemical sensing architecture for quantitative small-molecule analysis in complex biological media.
  • This technology holds significant potential for advancing point-of-care diagnostics and personalized medicine through rapid biomarker quantification.