abstract
The changes in palm oil, as affected by frying temperature, and content of the glycidyl esters (GEs) were
studied. Potato chips were fried intermittently in palm oil, which was heated for 8 h daily over five consecutive days. Frying was conducted at three frying temperatures: 150, 165 and 180C. Thermo-oxidative
alterations of the oil were measured by acid and anisidine values, changes in fatty acid composition, total
polar components, polar fraction composition and colour components formation. Content of GE was measured by liquid chromatography–mass spectrometry. Results showed that amount of products of hydrolysis, oxidation and polymerization (excluding decrease of degree of unsaturation) increased significantly
as a function of frying temperature and time. Between GEs of fatty acids the most abundant were esters of
palmitic and oleic acids. With increasing temperature and frying time, the content of GE decreased. The
extent of GE decrease was correlated with degree of oil degradation