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Investigating the Thermal Stability of Omega Fatty Acid-Enriched Vegetable Oils
Katalin Nagy1, Bogdan-Cezar Iacob1, Ede Bodoki1
1Analytical Chemistry Department, "Iuliu Hațieganu" University of Medicine and Pharmacy, 4, Louis Pasteur St., 400349 Cluj-Napoca, Romania.
Foods (Basel, Switzerland)
|September 28, 2024
Summary
High-temperature frying degrades omega fatty acids in vegetable oils, increasing harmful trans fatty acids (TFAs). High-oleic sunflower and blended oils show better thermal stability than conventional sunflower oil.
Area of Science:
- Food Science
- Nutritional Biochemistry
- Analytical Chemistry
Background:
- Vegetable oils rich in omega fatty acids are popular for cooking.
- High-temperature frying can degrade these oils, forming harmful compounds.
- Understanding oil stability is crucial for health and food industry practices.
Purpose of the Study:
- To assess the thermal stability of omega fatty acid-enriched vegetable oils during frying.
- To evaluate the degradation of omega-3, -6, and -9 fatty acids.
- To identify the formation of trans fatty acids (TFAs) and other harmful compounds.
Main Methods:
- Analysis of commercial vegetable oils (sunflower, high-oleic sunflower, rapeseed, blends).
- Exposure to high temperatures (180 °C to 230 °C) for varying durations.
- Fatty acid profiling using gas chromatography-mass spectrometry (GC-MS).
Main Results:
- Significant degradation of polyunsaturated fatty acids (PUFAs) observed with prolonged heating.
- Increase in saturated fatty acids (SFAs) and trans fatty acids (TFAs) under high temperatures.
- High-oleic sunflower and blended oils demonstrated superior thermal stability compared to conventional sunflower oil.
Conclusions:
- Oil selection for high-temperature cooking is critical to minimize health risks from degraded oils.
- Optimizing oil blends can enhance thermal stability and preserve nutritional quality.
- Findings support informed consumer choices and food industry best practices for oil utilization.
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