Under the right conditions, water can be solubilized into the oil, resulting in the hydrolysis of the oil into free fatty acid and partial glycerides. This is called chemical hydrolysis of the oil. Excessive hydrolysis will lead to the formation of more fatty acids and glycerol. The higher the temperature of the oil, the faster is the hydrolysis rate. The more water solubilized in the oil, the larger the extent of hydrolysis. In addition, the hydrolysis reaction is also catalyzed by the presence of acid, certain emulsifiers, and compounds that can form soaps. Hence, if the free fatty content of the oil is high, the free fatty acids present in the oil can help to catalyze the reaction, leading to more free fatty acids being formed. High levels of free fatty acids in the oil can also result in an increase of phosphorus content of the oil (Goh et al., 1982; Jacobsberg, 1983)