This takes place via the excited triplet riboflavin and triplet oxygen annihilation mechanism. Consequently, lipid oxidation photosensitised by riboflavin has been implicated as the causative factor in the off-flavour of many foods (Choe et al., 2005; Lee, Jung, & Kim, 1998). However, Ohama and Yagi (1969) reported that riboflavin in linoleic acid suppresses hydroperoxide formation under light. Also, Toyosaki, Yamamoto, and Mineshita (1987) showed that riboflavin tetrabutylate has an antioxidant effect on emulsions in the dark. To effectively evaluate the role of riboflavin in emulsion systems, the degradation of riboflavin and the stability of food lipids during storage should be further investigated.