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A surface functionalized nanoporous titania integrated microfluidic biochip.

Md Azahar Ali1, Saurabh Srivastava, Kunal Mondal

  • 1Department of Science and Technology Centre on Biomolecular Electronics, Biomedical Instrumentation Section, CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi-110012, India. bansi.malhotra@gmail.com ved.varun@gmail.com.

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Summary
This summary is machine-generated.

This study introduces a new nanoporous microfluidic biochip for efficient cholesterol detection. The biochip, utilizing functionalized chitosan and titanium dioxide nanoparticles, demonstrates high sensitivity and selectivity for clinical diagnostics.

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Area of Science:

  • Nanotechnology
  • Biomedical Engineering
  • Electrochemistry

Background:

  • Development of advanced biosensors for clinical diagnostics is crucial.
  • Microfluidic devices offer miniaturization and high throughput for biological analysis.
  • Titanium dioxide nanoparticles possess unique electrochemical properties beneficial for biosensing.

Purpose of the Study:

  • To develop and characterize a novel nanoporous microfluidic biochip for sensitive cholesterol detection.
  • To investigate the role of functionalized chitosan/anatase titanium dioxide nanoparticles in enhancing biosensor performance.
  • To evaluate the electrochemical behavior and diagnostic potential of the developed microfluidic biochip.

Main Methods:

  • Fabrication of a polydimethylsiloxane (PDMS) microfluidic assembly with a functionalized chitosan/anatase titanium dioxide nanoparticles (antTiO2-CH) electrode.
  • Enzyme functionalization of the electrode with cholesterol esterase (ChEt) and cholesterol oxidase (ChOx).
  • Characterization using X-ray photoelectron spectroscopy (XPS) for functional groups and Brunauer-Emmett-Teller (BET) analysis for surface area and pore size.
  • Electrochemical impedance spectroscopy (EIS) for evaluating impedimetric response and sensor performance.

Main Results:

  • The antTiO2-CH surface demonstrated significant functional groups for enzyme immobilization.
  • BET analysis quantified specific surface area and nanopore characteristics.
  • The microfluidic biochip exhibited high sensitivity (6.77 kΩ (mg dl(-1))(-1)), a low detection limit (0.2 mg dl(-1)), and a low Michaelis-Menten constant (1.3 mg dl(-1)).
  • Point defects in antTiO2 improved heterogeneous electron transfer, enhancing electrochemical performance.

Conclusions:

  • The developed nanoporous microfluidic biochip shows excellent performance for cholesterol sensing.
  • The combination of chitosan and antTiO2 nanoparticles provides a robust platform for enzyme immobilization and signal transduction.
  • This impedimetric microsystem holds significant promise for future clinical diagnostic applications.