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Surface Modification with a Catechol-Bearing Polypeptide and Sensing Applications.

Eda Aydindogan1, Emine Guler Celik1, Dilek Odaci Demirkol1

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A novel catechol-bearing polypeptide (CtP) was developed for electrochemical biosensors. This CtP approach enables versatile immobilization of biomolecules for glucose and IgG detection.

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Area of Science:

  • Electrochemistry
  • Biomaterials Science
  • Biosensor Technology

Background:

  • Development of advanced materials for biosensor fabrication is crucial for sensitive and selective analyte detection.
  • Catechol-bearing polypeptides offer unique properties for surface functionalization and biomolecule immobilization.

Purpose of the Study:

  • To synthesize a novel catechol-bearing polypeptide (CtP) for electrochemical biosensor applications.
  • To demonstrate the utility of CtP in immobilizing biorecognition elements for both enzymatic and affinity-based sensing.
  • To evaluate the performance of CtP-modified surfaces for glucose and immunoglobulin G (IgG) detection.

Main Methods:

  • Synthesis of catechol-bearing polypeptide (CtP).
  • Surface modification and characterization using cyclic voltammetry (CV), electrochemical impedance spectrometry (EIS), X-ray photoelectron spectroscopy (XPS), and contact angle measurements.
  • Fabrication and testing of glucose oxidase (GOx) biosensors using amperometry and anti-immunoglobulin G (Anti-IgG) biosensors using differential pulse voltammetry (DPV).

Main Results:

  • Successful synthesis and characterization of CtP.
  • Demonstrated effective immobilization of glucose oxidase and anti-immunoglobulin G on CtP-modified surfaces.
  • Achieved sensitive detection of glucose via amperometric measurements and IgG via DPV, showcasing the biosensor's performance.

Conclusions:

  • The developed CtP is a versatile platform for creating functional matrices for biomolecule immobilization.
  • CtP-coated surfaces show significant promise for the fabrication of advanced electrochemical biosensing systems.
  • The 'surface design with CtP' approach is adaptable for various biobased sensing applications.