A hematite-based photoelectrochemical platform for visible light-induced biosensing

Area of Science:

• Electrochemistry
• Biosensing
• Materials Science

Background:

• Nicotinamide adenine dinucleotide (NADH) is a crucial biomarker in various biological processes.
• Photoelectrochemical (PEC) biosensors offer sensitive detection methods.
• Hematite (Fe2O3) is a promising photoanode material for PEC applications.

Purpose of the Study:

• To develop the first hematite-based PEC biosensor for NADH detection under visible light.
• To enhance signal transduction using polydopamine immobilization of redox mediators.
• To demonstrate the biosensor's applicability for detecting clinically relevant analytes.

Main Methods:

• Fabrication of a hematite photoanode.
• Modification with mussel-inspired polydopamine for redox mediator immobilization.
• Integration into a PEC biosensor setup for electrochemical measurements under visible light irradiation.
• Enzymatic assays for glucose, ethanol, and lactate detection.

Main Results:

• The hematite-based PEC biosensor successfully detected NADH under visible light.
• Polydopamine enhanced the electrical signal of the hematite photoanode.
• The biosensor demonstrated enzymatic detection of glucose, ethanol, and lactate.
• Successful detection of glucose in human plasma samples was achieved.

Conclusions:

• The developed platform represents a novel hematite-based PEC biosensor for NADH detection.
• The use of polydopamine effectively enhances signal transduction in the PEC biosensor.
• The biosensor shows significant potential for practical applications in biological and clinical analysis.