Deep-frying at 180℃ or above is one of the most common food processing methods. Reac- tions such as oxidation, hydrolysis, isomerization and polymerization of oils and fats take place in the deep - frying process. After these reactions, the main products of triacylglycerol, the major component of oils and fats, are volatile compounds, hydrolysis products, oxidized triacylglycerol monomers, cyclic compounds, trans- configuration compounds and polymers etc. Well understanding the possibIe mecha- nisms of these reactions and main products of oils...