H2O2 determination by a biosensor based on hemoglobin.

Area of Science:

• Electrochemistry
• Biosensors
• Biochemistry

Background:

• Hydrogen peroxide (H2O2) detection is crucial in industry, environmental monitoring, and clinical diagnostics.
• H2O2 poses toxicity risks through various exposure routes.
• Hemoglobin, with its electroactive iron hemes, serves as a model for electron transfer studies and biosensing applications.

Purpose of the Study:

• To develop a novel electrochemical biosensor for hydrogen peroxide detection.
• To immobilize hemoglobin onto a Clark electrode for enhanced sensing capabilities.
• To investigate the electrocatalytic activity of immobilized hemoglobin for H2O2 reduction.

Main Methods:

• Hemoglobin was crosslinked with gelatin using glutaraldehyde and immobilized on a pretreated Teflon membrane.
• A Clark electrode was utilized as the base for the biosensor construction.
• Optimization of biosensor parameters including hemoglobin/gelatin ratio and glutaraldehyde concentration was performed.
• Characterization involved determining optimal pH and temperature, and assessing repeatability.

Main Results:

• The study successfully optimized conditions for hemoglobin immobilization and biosensor performance.
• Characterization confirmed the stability and reliability of the developed biosensor.
• Repeatability experiments yielded consistent results, with calculated variation coefficients.
• The optimized biosensor was effectively applied for the determination of H2O2 in real samples.

Conclusions:

• A novel and effective electrochemical biosensor for hydrogen peroxide detection has been developed.
• Immobilized hemoglobin demonstrates significant electrocatalytic activity for H2O2 reduction.
• The biosensor shows promise for practical applications in H2O2 determination in various samples.