Systematic Identification of Japanese Official Water-soluble Food Colors by Paper Chromatography

Ishida, Yukio; Inagaki, Nobuya; Shiota, Akihiko; Watanabe, Reiko

doi:10.1248/yakushi1947.73.7_736

Cited by 10 publications

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Preparation of Iodine‐131‐Labelled Rose‐Bengal by Radioactive Exchange Method

Chen

Yeh

1964

J Chinese Chemical Soc

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Labelling of rose bengal with iodine‐131 was studied by using carrier‐free NaI‐131 produced at the National Tsing Hua University. The effects of pH and hydrogen peroxide on the radioactive exchange reaction were investigated. It was observed that as high as 88% of iodine‐131 was exchanged under the optimum conditions found in the present study. The purity of the I‐131 labelled rose bengal obtained by the exchange method was examined by paper chromatography, and was found to be satisfactory.

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Preparation of Iodine‐131‐Labelled Rose‐Bengal by Radioactive Exchange Method

Chen

Yeh

1964

J Chinese Chemical Soc

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The composition of Erythrosins, Fluorescein, Phloxine and Rose Bengal: a study using thin-layer chromatography and solvent extraction

Marshall

1976

Histochem J

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Commercial samples of Erythrosin B (CI 45430), Erythrosin Y (CI 45425), Fluorescein (CI 45350), Phloxine (CI 45410) and Rose Bengal (CI 45440) have been analysed by thin-layer chromatography. The Erythrosins were found to be mixtures consisting in the main of 4'-iodofluorescein, 4', 5'-di-iodofluorescein, 2', 4', 5'-tri-iodofluorescein and 2',4',5',7'-tetraiodofluorescein, in some instances together with 2',4',5'-tri-iodo-4,5,6,7-tetrachlorofluorescein and 2',4',5',7'-tetraiodo- 4,5,6,7-tetrachlorofluorescein. Samples of Fluorescein were mixtures of the nominal dye usually with traces of several unidentified, fluorescent components. Those of Phloxine consisted mainly of mixtures of 4'-bromo-4,5,6,7-tetrachlorofluorescein, 4',5'-dibromo-4,5,6,7'-tetrachlorofluorescein, 2',4',5'-tribromo-4,5,6,7-tetrachlorofluorescein and 2',4',5',7'-tetrabromo-4,5,6,7-tetrachlorofluorescein, often with 4,5,6,7-tetrachlorofluorescein. Samples of Rose Bengal were mixtures of 4'-iodo-4,5,6,7-tetrachlorofluorescein,4',5'-di-iodo-4,5,6,7-tetrachlorofluorescein, 2',4',5'-tri-iodo-4,5,6,7-tetrachlorofluorescein and 2',4',5',7'-tetraiodo-4,5,6,7-tetrachlorofluorescein together with some unidentified components. Most of the commercial dye samples gave an insoluble residue when extracted with methanol. This residue was usually inorganic carbonate or halide. Some possible practical consequences of the various impurities are discussed.

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Chromatography of nitrofluoresceins, aminofluoresceins, and fluorescein isothiocyanates

Corey

McKinney

1962

Analytical Biochemistry

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Systematic Identification of Japanese Official Water-soluble Food Colors by Paper Chromatography

Cited by 10 publications

References 0 publications

Preparation of Iodine‐131‐Labelled Rose‐Bengal by Radioactive Exchange Method

Preparation of Iodine‐131‐Labelled Rose‐Bengal by Radioactive Exchange Method

The composition of Erythrosins, Fluorescein, Phloxine and Rose Bengal: a study using thin-layer chromatography and solvent extraction

Chromatography of nitrofluoresceins, aminofluoresceins, and fluorescein isothiocyanates

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