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Related Concept Videos

Microbial Biosensors01:17

Microbial Biosensors

17
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...
17

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Monitoring Protein Adsorption with Solid-state Nanopores
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Detection of a single enzyme molecule based on a solid-state nanopore sensor.

ShengWei Tan1, DeJian Gu, Hang Liu

  • 1State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, No. 2, Sipailou, Nanjing 210096, People's Republic of China.

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This study demonstrates how silicon nitride nanopores can detect single enzyme molecules and monitor biochemical reactions in real-time. This high-throughput technology offers a sensitive method for single-molecule analysis.

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Area of Science:

  • Nanotechnology
  • Biochemistry
  • Analytical Chemistry

Background:

  • Nanopore sensors offer high-throughput, low-cost single-molecule detection.
  • Solid-state nanopores are crucial tools in molecular analysis.

Purpose of the Study:

  • To fabricate and utilize silicon nitride (Si3N4) nanopores for single-molecule detection.
  • To analyze single horseradish peroxidase (HRP) molecular translocation events.
  • To investigate real-time single enzyme molecular biochemical reactions.

Main Methods:

  • Fabrication of silicon nitride (Si3N4) nanopores with diameters of ~28 and ~88 nm using a focused Ga ion beam.
  • Detection of single horseradish peroxidase (HRP) molecules using solid-state nanopores.
  • Real-time monitoring of enzyme-catalyzed reactions and product translocation.

Main Results:

  • Successful fabrication of Si3N4 nanopores for single-molecule analysis.
  • First-time analysis of single HRP molecular translocation events.
  • Demonstrated high sensitivity in detecting single enzyme molecules and their reactions in real-time.

Conclusions:

  • The developed Si3N4 nanopore system provides a sensitive platform for real-time single-molecule enzyme analysis.
  • This method holds potential for studying gene expression and enzyme dynamics at the single-molecule level.