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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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Dry Film Photoresist-based Electrochemical Microfluidic Biosensor Platform: Device Fabrication, On-chip Assay Preparation, and System Operation
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A 256 pixel magnetoresistive biosensor microarray in 0.18μm CMOS.

Drew A Hall1, Richard S Gaster1, Kofi Makinwa2

  • 1Stanford University, Stanford, CA 94305 USA.

IEEE Journal of Solid-State Circuits
|April 25, 2014
PubMed
Summary
This summary is machine-generated.

This study presents a new ultra-sensitive biosensor system using giant magnetoresistive spin-valve (GMR SV) sensors for early disease detection. The novel CMOS-integrated sensor array can detect ovarian cancer biomarkers at extremely low concentrations.

Keywords:
GMR spin-valvebiochipbiosensormagnetic biosensorproteomicssigma delta modulator

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Area of Science:

  • Nanomedicine
  • Biotechnology
  • Electrical Engineering

Background:

  • Magnetic nanotechnologies offer potential in nanomedicine for imaging, therapeutics, and disease detection.
  • Giant magnetoresistive spin-valve (GMR SV) sensors with magnetic nanotags (MNTs) are promising for ultra-sensitive biosensing in diagnostics.

Purpose of the Study:

  • To report an integrated sensor interface for a 256-element GMR SV biosensor array.
  • To develop a CMOS-based system for enhanced diagnostic capabilities.

Main Methods:

  • Design and fabrication of a 256-GMR SV biosensor array using 0.18 μm CMOS technology.
  • Integration of analog front-end and ΣΔ modulator in each column-level readout channel.
  • Performance evaluation using detection of secretory leukocyte peptidase inhibitor (SLPI).

Main Results:

  • The integrated sensor interface features 16 column-level readout channels, each with a compact ΣΔ modulator (0.054 mm²) offering 84 dB dynamic range and 49 nT/√Hz input-referred noise.
  • Successful detection of ovarian cancer biomarker SLPI at concentrations as low as 10 fM.
  • Demonstration of real-time kinetics monitoring capabilities.

Conclusions:

  • The developed GMR SV biosensor system offers ultra-high sensitivity for early disease detection.
  • This integrated system serves as a potential replacement for optical protein microarrays, enabling real-time monitoring.
  • The technology holds promise for advancing in-vitro diagnostics and personalized medicine.