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Structural determination of unknown subsidiary colors in food yellow no. 5 (Sunset yellow FCF)
M Yamada1, M Nakamura, T Yamada
1San-Ei Gen F.F.I., Inc., Osaka, Japan.
Chemical & Pharmaceutical Bulletin
|August 1, 1996
Abstract:
Major unknown subsidiary colors A (Sub A) and B (Sub B) in commercial Sunset Yellow FCF (Food Yellow No. 5 in Japan) have been isolated by preparative HPLC. Spectroscopic analyses of Sub A and Sub B revealed that their structures are trisodium salt of 6-hydroxy-7-(4-sulfophenyl)-5-(4-sulfophenylazo)-2-naphthale nesulfonic acid, and disodium salt of 3-hydroxy-4-(4-sulfophenylazo)-2-naphthalenesulfonic acid, respectively.