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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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VEGF Detection via Impedance Spectroscopy on Surface Functionalized Interdigitated Biosensor.

Yue-Der Lin1,2,3, Serge Ismael Zida1, Chu-Chun Yang2

  • 1Ph.D. Program of Electrical and Communications Engineering, Feng Chia University, No. 100, Wenhwa Road, Seatwen, Taichung 40724, Taiwan.

Journal of Functional Biomaterials
|July 28, 2023
PubMed
Summary
This summary is machine-generated.

A new, cost-effective biosensor platform effectively detects vascular endothelial growth factor (VEGF) using modified interdigitated sensors. This innovation enables sensitive and specific VEGF detection, crucial for diagnosing various diseases.

Keywords:
DNA aptamerimpedance spectroscopyinterdigitated sensorvascular endothelial growth factor (VEGF)

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Area of Science:

  • Biomedical Engineering
  • Biosensor Technology
  • Molecular Diagnostics

Background:

  • Vascular Endothelial Growth Factor (VEGF) is a critical biomarker in angiogenesis, wound healing, tumor growth, lung development, and retinal diseases.
  • Accurate detection and quantification of VEGF are vital for clinical diagnosis and disease management.
  • Existing methods for VEGF detection can be complex and costly.

Purpose of the Study:

  • To develop a simple, cost-effective platform for sensitive and specific detection of VEGF protein.
  • To utilize commercially available interdigitated sensors modified with DNA aptamers for optimal VEGF capture.
  • To evaluate the performance of the proposed biosensor for potential clinical applications.

Main Methods:

  • Surface modification of interdigitated sensors with DNA aptamers for VEGF capture.
  • Impedance spectroscopy to measure dielectric changes caused by aptamer-VEGF binding.
  • Comparison of impedance spectra on pristine, monolayer, and aptamer-grafted surfaces.
  • Testing sensor sensitivity down to 5 pM (200 pg/mL) VEGF and specificity against platelet-derived growth factor.

Main Results:

  • The aptamer-functionalized interdigitated sensor demonstrated high sensitivity, detecting VEGF at concentrations as low as 5 pM.
  • The sensor exhibited high specificity for VEGF, confirmed by impedance comparisons with platelet-derived growth factor.
  • Impedance spectroscopy effectively visualized sensor performance, with Nyquist plots aiding data interpretation.

Conclusions:

  • The developed interdigitated sensor platform offers a simple, cost-effective, and highly sensitive method for VEGF detection.
  • The biosensor shows significant potential as a smart device for clinical diagnosis of VEGF-related conditions.
  • This approach provides a promising template for developing advanced biosensors for various biomarkers.