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

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.