Structural determination of unknown subsidiary colors in commercial food red Nos. 2 and 102.
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.
Yamada
M
M
San-Ei Gen F.F.I., Inc., Osaka, Japan.
Kato
Y
Y
Nakamura
M
M
Yamada
T
T
Maitani
T
T
Goda
Y
Y
D000548:Amaranth Dye / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D005505:Food Coloring Agents / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D013056:Spectrophotometry, Ultraviolet
D005505:Food Coloring Agents; D000548:Amaranth Dye