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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 self assembled monolayer based microfluidic sensor for urea detection.

Saurabh Srivastava1, Pratima R Solanki, Ajeet Kaushik

  • 1Department of Science and Technology Centre on Biomolecular Electronics, Biomedical Instrumentation Section, National Physical Laboratory, New Delhi 110012, India.

Nanoscale
|May 27, 2011
PubMed
Summary
This summary is machine-generated.

This study developed a novel biosensor for urea detection by immobilizing urease and glutamate dehydrogenase enzymes on gold electrodes. The sensor demonstrates high sensitivity and a low detection limit for accurate urea estimation.

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Area of Science:

  • Biotechnology and Biosensor Development
  • Electrochemistry
  • Analytical Chemistry

Background:

  • Accurate urea estimation is crucial for clinical diagnostics and environmental monitoring.
  • Existing methods for urea detection can be time-consuming or require complex instrumentation.
  • Enzyme-based biosensors offer a promising alternative for rapid and sensitive analyte detection.

Purpose of the Study:

  • To develop and characterize a novel co-immobilized enzyme biosensor for urea estimation.
  • To utilize microfluidic channels and self-assembled monolayers for enhanced sensor performance.
  • To evaluate the electrochemical performance of the developed bioelectrode for urea detection.

Main Methods:

  • Covalent co-immobilization of urease (Urs) and glutamate dehydrogenase (GLDH) onto a 10-carboxy-1-decanthiol (CDT) self-assembled monolayer (SAM) on patterned gold (Au) electrodes.
  • Fabrication of poly(dimethylsiloxane) (PDMS) microfluidic channels for sample delivery.
  • Characterization using Fourier transform infrared (FTIR) spectroscopy, contact angle (CA), atomic force microscopy (AFM), and electrochemical cyclic voltammetry (CV).

Main Results:

  • Successful co-immobilization of Urs and GLDH onto the CDT/Au electrode surface was confirmed.
  • The Urs-GLDH/CDT/Au bioelectrode exhibited a linear response to urea concentrations ranging from 10 to 100 mg dl(-1).
  • The developed sensor demonstrated a low detection limit of 9 mg dl(-1) and high sensitivity of 7.5 μA mM(-1) cm(-2).

Conclusions:

  • The developed co-immobilized enzyme biosensor is effective for sensitive and quantitative urea estimation.
  • The integration of microfluidics and SAMs enhances the performance of electrochemical biosensors.
  • This approach holds potential for developing rapid point-of-care diagnostic tools for urea monitoring.