Adsorption of xanthene food additive dyes to cellulose granules |
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Authors: | Aya Tabara Chihiro Yamane Makoto Abe Masaharu Seguchi |
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Affiliation: | (1) Faculty of Home Economics, Laboratory of Food Technology, Kobe Women’s University, Suma-Ku, Kobe City 654-8585, Japan;(2) Faculty of Intercultural Studies, Department of Japanese Studies, Gakushuin Women’s College, 3-20-1 Toyama, Shinjuku-ku, Tokyo 162-8650, Japan; |
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Abstract: | It was found that three kinds of the synthetic food additive dyes, red nr. 3 (erythrosine), nr. 104 (phloxine), and nr. 105 (rose bengal) were adsorbed to the surface of charred cellulose granules and the maximum amounts of adsorption of these dyes were 3.75, 3.42, and 4.74 mg/g cellulose, respectively. Scanning electron microscopy-electron probe micro analysis (SEM-EPMA) showed a coating of the dyes on the surface of charred cellulose granules. Electron spectroscopy for chemical analysis (ESCA) suggested the presence of NH3 + in the surface of charred cellulose granules. Since all three dye compounds have both anionic carboxylate and hydrophobic groups and were released from the surface of charred cellulose granules by 0.1 N NaOH solution, it was surmised that these three food additive dyes were bound to the surface of cellulose granules by both ionic and physical interactions. |
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