Scientists report in ACS’ Journal of Agricultural and Food Chemistry that olive oil withstands the heat of the fryer or pan better than several seed oils to yield more healthful food.
Mohamed Bouaziz and colleagues from the University of Sfax (Tunisia) note that different oils have a range of physical, chemical and nutritional properties that can degrade oil quality when heated. Some of these changes can lead to the formation of new compounds that are potentially toxic. By-products of heating oil can also lower the nutritional value of the food being fried. Bouaziz’s team wanted to find out which cooking oil can maintain its quality under high heat and repeated use.
Refined olive, corn, soybean, and sunflower oils were used as cooking oils for deep-frying at two different temperatures, 160° and 190°C, and for pan-frying of potatoes at 180°C for 10 successive sessions under the usual domestic practice. Several chemical parameters were assayed during frying operations to evaluate the status of the frying oils. Refined olive oil, as frying oil, was found to be more stable than the refined seed oils. In fact, this oil has proven the greatest resistance to oxidative deterioration, and its trans-fatty acid contents and percentages of total polar compounds were found to be lower at 160°C during deep-frying. Finally, chemometric analysis has demonstrated that the lowest deterioration of the quality of all refined oils occurred in the refined olive oil during deep-frying at 160°C and the highest deterioration occurred in the refined sunflower oil during pan-frying at 180°C.