# The Role of Methionine in the Formation of Key Aroma Compounds in Microwaved Walnuts

## TL;DR

This study shows how methionine helps create key aroma compounds in microwaved walnuts, improving their flavor for plant-based protein products.

## Contribution

The study identifies methionine's pivotal role in forming aroma compounds during microwave treatment of walnuts.

## Key findings

- Gas chromatography mass spectrometry identified 13 key aroma components in five walnut varieties.
- Methionine was found to be crucial in producing pyrazine and heterocyclic compounds during microwave treatment.
- Microwave processing shows potential for enhancing the flavor of plant-based proteins.

## Abstract

Given the growing consumer preference for plant-based proteins, improving their flavor profiles is essential for market success. Despite their nutritional benefits, plant proteins, such as walnut proteins, often suffer from weaker and less appealing flavors than those of animal proteins. This study investigated the pivotal role of amino acids in walnut aroma development during microwave treatment. Through gas chromatography mass spectrometry analysis of five walnut varieties, considerable differences in the aroma compound composition were identified with 13 key aroma components highlighted via relative odor activity value analysis. The present results demonstrated that methionine played a predominant role in pyrazine and heterocyclic compound production, underscoring its importance in walnut aroma formation. Thus, heat treatments, particularly microwave processing, show potential for enhancing flavor under the conditions investigated. These findings suggest a possible approach for improving flavor profiles in plant protein–based systems.