# Electron Paramagnetic Resonance Spectroscopy to Evaluate the Oxidative Stability of Beer, Wine, and Oils

## TL;DR

This review explores how EPR spectroscopy can assess oxidative stability in beer, wine, and oils to improve food quality and shelf life.

## Contribution

The paper reviews EPR spectroscopy's novel applications for studying oxidation in food and beverage matrices.

## Key findings

- EPR spectroscopy effectively detects free radicals and transition metals involved in oxidation.
- Portable EPR instruments offer practical solutions for monitoring oxidative stability in industry.
- EPR provides insights into antioxidant activity and shelf-life extension in food products.

## Abstract

Oxidative stability plays an important role in determining the quality of oxidation-sensitive foods and beverages such as beer, wine, and edible oils. Oxidation occurs through radical chain reactions producing off-flavors and leading to deterioration and decrease in the quality and nutritional value of food and beverages. In this context, electron paramagnetic resonance (EPR) spectroscopy has emerged as a powerful and selective technique for investigating reactions involving paramagnetic species, particularly free radicals and transition metal ions. This review provides a critical overview of the applications of EPR spectroscopy in the study of the oxidative stability and antioxidant activity of the above-mentioned matrices. It highlights the main methodological approaches that this technique can offer to gain insight into oxidative processes. Furthermore, current advances in low-cost and portable EPR instrumentation are discussed, along with their implications for broader adoption in both research and industry settings. The aim is to provide an up-to-date literature survey on the application of EPR spectroscopy for studying the oxidative stability and antioxidant activity of beer, wine, and edible oils, providing a methodological tool for academic and food industry researchers interested in monitoring, improving, and extending food shelf life through reliable analytical tools.