抄録
Under the condition of light irradiation the reaction of riboflavin-2', 3', 4', 5'-tetrabutyrate with linoleic acid (or methyl linoleate) was investigated. The results revealed that the formation of linoleic acid peroxide was markedly inhibited in the presence of riboflavin tetrabutyrate. Absorbance at 447 mμ (E_<447>) of B_2-butyrate dissolved in linoleic acid was decreased by light irradiation, but this decrease was partially recovered by standing the solution in the dark. Since this recovery of E_<447> was partial and not complete, it was considered that at least two processes, viz. reversible and irreversible processes, were included. The reversible decrease of E_<447> of B_2-butyrate is probably due to the photoreduction of B_2-butyrate upon irradiation. The irreversible decrease of E_<447> of B_2-butyrate may be attributed to the decomposition of the isoalloxazine nucleus of B_2-butyrate caused by its reaction with linoleic acid in the process of the peroxide formation.
