抄録
Reaction of riboflavin 2′, 3′, 4′, 5′-tetrabutyrate (R-BUT) with linoleic acid (or methyl linoleate) under ultra violet light irradiation was investigated. The formation of linoleic acid peroxide was markedly repressed in the presence of R-BUT. Absorbance at 447mμ of R-BUT dissolved in linoleic acid decreased by ultra violet light irradiation, but partially recovered by standing the irradiated solution in the dark. Since this recovery was limited to some extent, at least two processes, viz. reversible and irreversible processes, are considered to exist. The reversible decrease in absorbance at 447mμ of R-BUT could be attributed to the photoreduction of riboflavin part of R-BUT. The irreversible decrease of absorbance at 447mμ is probably due to the decomposition of the isoalloxazine nucleus of R-BUT caused by the reaction with linoleic acid in the process of its peroxide formation. The formation of linoleic acid peroxide upon aeration in the dark was also repressed by R-BUT.
