INTRODUCTION
Lipid oxidation has been one of the largest problems in food preservation over the last decade due to their oxidative damage to the sensory and nutritional qualities of food products (German 1999). The oxidation of fatty acids, excluding enzymatic and bacterial spoilage, is claimed to be one of the main causes of food nutritive value loss. Moreover, toxic compounds are generated during the oxidation process (Kubow 1990, 1992; Frankel 1998). High intake of oxidative foods could cause damage to the biological constituents in tissue and thus was relevant to a series of health problems (Romero et al. 1998; Long et al. 2006).