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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 9, 2026

Electrochemical Impedance Spectroscopy as a Tool for Electrochemical Rate Constant Estimation
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Published on: October 10, 2018

A CMOS Electrochemical Impedance Spectroscopy (EIS) Biosensor Array.

Arun Manickam, Aaron Chevalier, Mark McDermott

    IEEE Transactions on Biomedical Circuits and Systems
    |July 16, 2013
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel biosensor array for real-time detection of DNA and proteins without molecular labels, utilizing electrochemical impedance spectroscopy (EIS). The integrated system offers high sensitivity and a wide dynamic range for advanced biological analysis.

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    Area of Science:

    • Biomedical Engineering
    • Nanotechnology
    • Analytical Chemistry

    Background:

    • Biosensors are crucial for detecting biological analytes.
    • Label-free detection methods are highly desirable for simplifying assays and reducing costs.
    • Electrochemical impedance spectroscopy (EIS) offers a sensitive method for monitoring interfacial changes.

    Purpose of the Study:

    • To develop a fully integrated, high-density biosensor array.
    • To demonstrate label-free, real-time detection of biological analytes like DNA and proteins.
    • To leverage electrochemical impedance spectroscopy (EIS) for sensitive impedance measurements.

    Main Methods:

    • Fabrication of a 10x10 biosensor array using a standard complementary metal-oxide semiconductor (CMOS) process.
    • Integration of biocompatible gold (Au) electrode transducers and embedded sensor circuitry in each pixel.
    • Utilizing a coherent detector for precise measurement of electrode-electrolyte interface impedance.

    Main Results:

    • Successful real-time, label-free detection of DNA and proteins.
    • Concurrent measurement of admittance as low as 10^-8 Ω^-1 across the array.
    • Achieved a wide detection dynamic range exceeding 90 dB over a frequency range of 10 Hz to 50 MHz.

    Conclusions:

    • The developed integrated biosensor array enables sensitive and efficient detection of biological molecules.
    • The system's label-free capability and high performance pave the way for advanced point-of-care diagnostics.
    • CMOS integration offers a scalable platform for future biosensor development.