French Fries oleuropein content during the successive deep frying in oils enriched with an olive leaf extract

Summary Olive oil, sunflower oil and soybean oil were enriched with an olive ( Olea Europaea ) leaf extract rich in oleuropein at a supplementation level of 100 mg total phenolics per kg oil. Supplemented oils were used for deep frying of potatoes for eight successive frying sessions without replenishment under domestic frying conditions. Supplemented oils contained oleuropein while deep frying resulted in a gradual decrease in oils oleuropein...