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Related Experiment Video

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Highly sensitive biofunctionalized mesoporous electrospun TiO(2) nanofiber based interface for biosensing.

Kunal Mondal1, Md Azahar Ali, Ved V Agrawal

  • 1Department of Chemical Engineering, Indian Institute of Technology Kanpur , Kanpur, 208016, India.

ACS Applied Materials & Interfaces
|January 23, 2014
PubMed
Summary
This summary is machine-generated.

Researchers developed novel titania nanofiber mats for detecting esterified cholesterol using an electrochemical biosensor. This advancement offers a promising platform for creating miniaturized diagnostic devices with high sensitivity and rapid response times.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Biotechnology

Background:

  • Esterified cholesterol detection is crucial for diagnosing cardiovascular diseases.
  • Existing biosensors often face limitations in sensitivity, stability, and detection speed.
  • Developing advanced nanomaterials is key to overcoming these challenges in biosensing.

Purpose of the Study:

  • To fabricate surface-modified and aligned mesoporous anatase titania nanofiber mats (TiO2-NF) for esterified cholesterol detection.
  • To immobilize enzymes cholesterol esterase (ChEt) and cholesterol oxidase (ChOx) onto the TiO2-NF surface for enhanced biosensing.
  • To evaluate the performance of the developed TiO2-NF-based electrochemical biosensor.

Main Methods:

  • Electrospinning of polyvinylpyrrolidone (PVP) and titanium isopropoxide precursor to create mesoporous TiO2-NF.
  • Oxygen plasma treatment to introduce hydrophilic functional groups (-COOH, -CHO) on the nanofiber surface.
  • Covalent immobilization of ChEt and ChOx using EDC-NHS chemistry onto the plasma-treated TiO2-NF (cTiO2-NF).
  • Electrochemical detection of esterified cholesterol using the fabricated bioelectrode.

Main Results:

  • Mesoporous TiO2-NF with diameters of 30-60 nm were successfully fabricated and partially aligned.
  • High mesoporosity (∼61%) facilitated enhanced enzyme loading.
  • The ChEt-ChOx/cTiO2-NF bioelectrode exhibited excellent voltammetric and catalytic response.
  • Achieved a low detection limit (0.49 mM), high sensitivity (181.6 μA/mg dL(-1)/cm(2)), and rapid detection (20 s).

Conclusions:

  • Surface-modified and aligned mesoporous TiO2-NF provide a robust platform for enzyme immobilization.
  • The developed electrochemical biosensor demonstrates superior performance for esterified cholesterol detection.
  • This strategy holds significant potential for the development of miniaturized biosensing devices.