Lipids can undergo deterioration in various ways during processing, handling, and
storage of food products. Two of the typical reactions of lipids are hydrolysis and oxidation.
Hydrolytic rancidity of lipids is caused by hydrolysis of the ester linkage resulting in the
formation of free fatty acids and glycerol. This reaction is catalyzed by high temperatures,
acids, lipolytic enzymes, and high moisture content in vegetable oils. However, hydrolytic
cleavage is not of great influence in the development of off-flavors due to modern refining
techniques.