title: Spectroscopic characterization of SC-NTR: a subsidiary dye of allura red AC dye (FD&C red no. 40).
abstract: A major subsidiary dye in US certified Allura Red AC dye (FD&C Red No. 40) has been isolated by preparative high performance liquid chromatography. The paper chromatographic properties of the isolated dye indicate that it is the dye designated as SC-NTR in a previous paper (Marmion 1971). Spectroscopic analysis of the isolated dye is consistent with the disodium salt of 6-hydroxy-5-(2-methoxy-5-methyl-3-sulphophenylazo)-2-naphthalen esulphonic acid, which is an azo-coupling product between the meta-isomer of cresidine-p-sulphonic acid (CSA) and Schaeffer's salt (SS).
authors.affiliation: Division of Food Additives, National Institute of Hygienic Sciences, Tokyo, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Takeda
authors.forename: Y
authors.initials: Y
authors.lastname: Goda
authors.forename: H
authors.initials: H
authors.lastname: Noguchi
authors.forename: T
authors.initials: T
authors.lastname: Yamada
authors.forename: K
authors.initials: K
authors.lastname: Yoshihira
authors.forename: M
authors.initials: M
authors.lastname: Takeda
mesh_terms: D001391:Azo Compounds / Q000032:analysis* / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D002854:Chromatography, Paper; D005503:Food Additives / Q000032:analysis*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D016339:Spectrometry, Mass, Fast Atom Bombardment
chemical_list: D001391:Azo Compounds; D005503:Food Additives; C087240:SC-NTR; C005915:Allura Red AC Dye