High-throughput superoxide anion radical scavenging capacity assay

Area of Science:

• Biochemistry
• Analytical Chemistry

Background:

• Superoxide anion radical (O2(•-)) is a reactive oxygen species implicated in oxidative stress.
• Accurate and efficient assays are needed to quantify antioxidant capacity against O2(•-).

Purpose of the Study:

• To develop and validate a high-throughput assay for superoxide anion radical scavenging capacity.
• To optimize reaction conditions for assay reliability and sensitivity.

Main Methods:

• Utilized the xanthine oxidase/xanthine reaction system for O2(•-) generation.
• Optimized parameters including wavelength, reactant concentrations, temperature, time, pH, and solvents.
• Validated assay performance through linearity, precision, accuracy, and stability assessments.

Main Results:

• Achieved high linearity (r(2) = 0.9513-0.9957) and good precision (intraday RSD 1.13-4.05%, interday RSD 2.13-5.62%).
• Demonstrated accuracy (95.64-97.42% recovery) and stability.
• Showed high correlation (r > 0.99) with a conventional colorimetric method.

Conclusions:

• The developed high-throughput assay is accurate, reliable, and efficient for measuring O2(•-) scavenging capacity.
• Suitable for screening large numbers of samples, including food extracts and natural products.
• Facilitates the identification of potential superoxide anion radical scavengers with minimal sample requirements.