Structural determination of unknown subsidiary colors in commercial food red Nos. 2 and 102

Chemical & Pharmaceutical Bulletin
M YamadaY Goda

Abstract

Major subsidiary colors A (Sub A) and B (Sub B) in commercial Food Red No. 102, and colors C (Sub C) and D (Sub D) in commercial Food Red No.2 were isolated. These structures were characterized by physicochemical evidence. The structures of Sub A, B, and C are trisodium salt of 7-hydroxy-8-(6-sulfonaphthyl-2-azo)-1,3-naphthalenedisulfonic++ + acid, disodium salt of 4-amino-3-(4-sulfonaphthyl-1-azo)-1-naphthalenesulfonic acid and trisodium salt of 3-hydroxy-4-(6-sulfonaphthyl-2-azo)-2,7-naphthalenedisulfonic++ + acid, respectively. Sub D was identified as Sub B.

Citations

Jul 19, 2013·Shokuhin eiseigaku zasshi. Journal of the Food Hygienic Society of Japan·Mami GodaMasami Harada
Jan 31, 2002·Shokuhin eiseigaku zasshi. Journal of the Food Hygienic Society of Japan·S TsujiY Tonogai
Jan 5, 2002·Shokuhin eiseigaku zasshi. Journal of the Food Hygienic Society of Japan·E NgangM Takeda
Aug 7, 2001·Shokuhin eiseigaku zasshi. Journal of the Food Hygienic Society of Japan·S TsujiY Tonogai

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