Liberation of Halide Ions from Xanthene Colors (Food Red Nos. 3,104 and 105) by Photo-Irradiation

概要

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Ion-chromatographic analyses were performed to quantitate the halide ions liberated by photo-irradiation from halogen-substituted xanthene colors (Food Red Nos. 3,104 and 105). To elucidate the wavelength dependency of this phenomenon, aqueous solutions of the xanthene colors were photo-irradiated through various optical filters to provide selected transmission bands. The results suggest that the liberation of bromide and iodide from the xanthene moiety and chloride from the benzene moiety follows irradiation with visible light and UV light, respectively. It is known that solutions of these xanthene colors produce singlet oxygens via phtoactivation of the dye molecule and transfer of the energy to dissolved oxygen. Therefore, the liberation was also studied in the presence of the substances which alter the life-time of singlet oxygen. The results suggest that singlet oxygen has some effect on the liberation of halide ions from these food colors.
社団法人日本薬学会の論文
1994-07-15