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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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Related Experiment Video

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Highly Sensitive and Rapid Fluorescence Detection with a Portable FRET Analyzer
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A Portable Readout System for Biomarker Detection with Aptamer-Modified CMOS ISFET Array.

Dmitriy Ryazantsev1,2, Mark Shustinskiy2, Andrey Sheshil1,2

  • 1Scientific-Manufacturing Complex Technological Centre, 1-7 Shokin Square, Zelenograd, Moscow 124498, Russia.

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Summary
This summary is machine-generated.

This study presents a portable device for aptamer-based biosensors using ion-sensitive field-effect transistors (ISFETs) for rapid biomarker detection. The developed system achieved sensitive detection of troponin I, aiding in diagnosing acute myocardial infarction at the point of care.

Keywords:
acute myocardial infarctionaptamerbiosensorion-sensitive field effect transistorpoint-of-care testingtroponin I

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Area of Science:

  • Biomedical Engineering
  • Biosensor Technology
  • Nanotechnology

Background:

  • Aptasensors utilizing ion-sensitive field-effect transistors (ISFETs) enable label-free biomarker detection for point-of-care testing.
  • Development of portable readout devices is crucial for advancing ISFET aptasensor applications.

Purpose of the Study:

  • To develop a portable, PC-controlled device for detecting aptamer-target interactions using ISFETs.
  • To optimize ISFET structures and readout circuits for enhanced sensitivity and signal integrity.
  • To demonstrate the device's capability for detecting clinically relevant biomarkers like troponin I.

Main Methods:

  • Fabrication and optimization of Ta2O5-gated ISFET structures.
  • Integration of CMOS readout circuits with linear transfer functions.
  • Design of an analog signal digitizer with selectable reference voltage modes (constant voltage and superimposed sine wave).
  • Aptamer-based detection of troponin I using the developed ISFET device.

Main Results:

  • Optimized ISFETs minimized trapped charge and capacitive attenuation.
  • The sine wave reference voltage method improved sensitivity and reduced drift.
  • A limit of detection of 3.27 ng/mL for troponin I was achieved.
  • Successful discrimination of acute myocardial infarction was demonstrated.

Conclusions:

  • The developed portable ISFET device facilitates sensitive and label-free detection of biomarkers.
  • The device platform supports multiplexed detection for diverse point-of-care applications.
  • This technology holds promise for improving diagnostic capabilities in clinical settings.