Comprehensive evaluation of antioxidant activity: a chemometric approach using principal component analysis

Area of Science:

• Analytical Chemistry
• Computational Chemistry

Background:

• Evaluating antioxidant activity is crucial for understanding compound efficacy.
• Traditional methods like DPPH assays can be limited in detailed kinetic and concentration-dependent analysis.

Purpose of the Study:

• To develop a novel chemometric approach for assessing radical scavenging activity.
• To propose new parameters derived from UV-Vis spectra and PCA for comprehensive compound characterization.

Main Methods:

• Utilized the 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay combined with Principal Component Analysis (PCA).
• Investigated variations in radical scavenging profiles across different test durations and compound concentrations ([AH]/[DPPH] molar ratios).
• Analyzed full-range UV-Vis spectra to extract detailed kinetic and concentration-dependent information.

Main Results:

• Proposed new antioxidant activity evaluation parameters (PC1, mPC1, maxPC1).
• These parameters showed good agreement with reference DPPH results (% RSA and IC50).
• PCA profiles provided superior patterns for characterizing radical scavenging activity, enabling visualization of compound similarities and differences.

Conclusions:

• The novel chemometric approach offers a more comprehensive evaluation of radical scavenging activity.
• PCA provides a powerful tool for visualizing complex reaction kinetics and concentration effects.
• The proposed parameters enhance the understanding of antioxidant behavior in biogenic amine related compounds.