Development of enzyme-based bar code-style lateral-flow assay for hydrogen peroxide determination

Area of Science:

• Biomedical Engineering
• Analytical Chemistry
• Biosensors

Background:

• Lateral-flow assays are widely used for rapid diagnostics.
• Existing bar code assays often rely on stepwise analyte capture.
• Enzymatic detection offers an alternative principle for lateral-flow systems.

Purpose of the Study:

• To develop a bar code lateral-flow assay for semi-quantifying hydrogen peroxide.
• To establish an enzyme-based detection system for rapid, visual results.
• To create a low-cost diagnostic tool applicable in resource-limited settings.

Main Methods:

• A nitrocellulose membrane was coated with goat anti-mouse IgG-horseradish peroxidase conjugate.
• A peroxidase substrate pad was incorporated into the assay.
• The assay principle relies on the rate-limited release of 3,3',5,5'-tetramethylbenzidine (TMB) controlled by hydrogen peroxide (H2O2).

Main Results:

• The assay semi-quantified hydrogen peroxide in the micromole range within 9 minutes.
• Results were presented as three distinct ladder bars, requiring no external reading device.
• The system demonstrated a signal response for glucose detection between 5 microM and 100 microM when coupled with H2O2-generating enzymes.

Conclusions:

• The developed bar code lateral-flow assay offers a simple, readable, and inexpensive method for hydrogen peroxide semi-quantification.
• This enzymatic approach provides a cost-effective alternative to expensive biosensors, particularly for developing countries.
• The assay's adaptability allows for the detection of various clinically and environmentally relevant analytes.