The changes in the volatile aldehydes formed during the deep-fat frying process

Area of Science:

• Food Chemistry
• Analytical Chemistry
• Food Safety

Background:

• Volatile aldehydes (VAs) are key indicators of lipid oxidation and food quality.
• Understanding VA formation during cooking is crucial for assessing food safety and oil stability.

Purpose of the Study:

• To comparatively investigate volatile aldehyde formation during soybean oil heating and the frying of wheat dough and chicken breast meat.
• To establish VA profiles as indicators for evaluating frying oil and fried food quality and safety.

Main Methods:

• Solid-phase micro-extraction-gas chromatography-mass spectrometry (SPME-GC-MS) was employed for VA detection and quantification.
• Comparative analysis of VA relative amounts (RAs) under different heating and frying conditions.

Main Results:

• VA levels peaked earlier during food frying compared to oil heating alone.
• Chicken breast meat frying resulted in more significant VA changes than wheat dough frying due to higher moisture and nutrient content.
• Free radical reactions, including isomerization, were identified as mechanisms driving VA formation.

Conclusions:

• VA formation kinetics differ between oil heating and food frying.
• VA profiles provide valuable insights into the quality and safety of frying oils and fried foods.
• The study highlights the utility of VAs as biomarkers for oxidative stress during deep-fat frying.