Volatile Compound Analysis in Edible Oils

Volatile compounds in edible oils are key determinants of flavour, quality and shelf-life, encompassing classes such as aldehydes, ketones, alcohols, esters, pyrazines and furans. These constituents arise from enzymatic reactions during seed pressing, thermal processes such as roasting and frying, and from oxidative degradation of unsaturated fatty acids. Analytical advances, notably headspace solid-phase microextraction coupled with gas chromatography–mass spectrometry, comprehensive two-dimensional gas chromatography and ion mobility spectrometry, now permit sensitive profiling and quantification of hundreds of volatiles. Multivariate statistical tools, such as principal component analysis and relative odour activity values, facilitate correlation of chemical data with sensory attributes, enabling marker-based assessment of oil authenticity, processing conditions and oxidative status. Emerging methods emphasise quantitative reliability through optimised experimental design, while hyphenated techniques reveal reaction pathways leading to secondary and tertiary volatiles. This integrated approach underpins quality control across the supply chain, informs product development for targeted flavour profiles and supports strategies to retard rancidity in diverse oils from rapeseed and sunflower to nut and seed-derived varieties.

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Volatile Compound Analysis in Edible Oils publication trend

The graph below shows the total number of articles in volatile compound analysis in edible oils across all publications each year (not limited to Nature Index journals).

Technical terms

Volatile organic compounds (VOCs): Low-molecular-weight substances that readily evaporate and contribute to aroma and flavour in oils.

Headspace solid-phase microextraction (HS-SPME): A solvent-free sampling technique that concentrates volatiles from the gas phase above a sample onto a coated fibre for subsequent analysis.

Comprehensive two-dimensional gas chromatography–time-of-flight mass spectrometry (GC × GC–ToFMS): A high-resolution chromatographic method that separates complex mixtures in two dimensions before mass spectral detection, enhancing sensitivity and compound resolution.

Gas chromatography–ion mobility spectrometry (GC-IMS): A hyphenated technique combining chromatographic separation with ion mobility detection to profile volatiles based on gas-phase ion drift times.

Principal component analysis (PCA): A statistical tool that reduces data dimensionality by transforming correlated variables into orthogonal principal components to highlight patterns and groupings.

References

1. Formation of Secondary and Tertiary Volatile Compounds Resulting from the Lipid Oxidation of Rapeseed Oil. Foods (2021).
2. The Effect of Different Extraction Methods on Extraction Yield, Physicochemical Properties, and Volatile Compounds from Field Muskmelon Seed Oil. Foods (2022).
3. Optimisation of headspace solid-phase microextraction with comprehensive two-dimensional gas chromatography–time of flight mass spectrometry (HS-SPME–GC × GC–ToFMS) for quantitative analysis of volatile compounds in vegetable oils using statistical experimental design. Journal of Food Composition and Analysis (2022).
4. Roasting treatments affect oil extraction rate, fatty acids, oxidative stability, antioxidant activity, and flavor of walnut oil. Frontiers in Nutrition (2023).