Reference

Preparation and spectral compilation of FD & C Red No

Preparation and spectral compilation of FD & C Red No. 40 intermediates and subsidiary dyes. Bell, Sandra J. (Div. Color Technol., Food Drug Adm., Washington, D. C. 61660-26-2 and 98-42-0 are cas registry numbers. These chemicals are also mentioned in this article., USA). J. Assoc. Off. Anal. Chem., 59(6), 1294-311 (English) 1976. CODEN: JANCA2. DOCUMENT TYPE: Journal CA Section: 40 (Dyes, Fluorescent Whitening Agents, and Photosensitizers) Section cross-reference(s): 17 FD&C Red No. 40 [25956-17-6] may contain higher or lower sulfonated subsidiary dyes, depending on the purity of intermediates used. Samples of 10 possible subsidiaries were prepd. and purified. They are to serve as analytical stds. to aid in the identification of unknown compds. frequently appearing during the anal. of certification samples. Visible, UV, and IR spectra as well as absorptivities and molar extinction coeffs. are given for each dye. .

Decomposition of 4,4'-(diazoamino)-bis(5-methoxy-2-methylbenezenesulfonic acid) in solutions of FD+C Red No

Decomposition of 4,4'-(diazoamino)-bis(5-methoxy-2-methylbenezenesulfonic acid) in solutions of FD+C Red No. 40. Richfield-Fratz, Naomi (Div. Color Technol., Food Drug Adm., Washington, DC 20204, USA). J. Assoc. Off. Anal. Chem., 67(4), 844-5 (English) 1984. CODEN: JANCA2. ISSN: 0004-5756. DOCUMENT TYPE: Journal CA Section: 17 (Food and Feed Chemistry) 4,4'-(Diazoamino)-bis(5-methoxy-2-methylbenzenesulfonic acid) [60112-02-9], when present as a reaction byproduct in FD&C Red No. 40 [25956-17-6], is shown to decomp. rapidly in aq. solns. of the color additive. The decompn. is stopped by the addn. of Na borate buffer. Quant. liq. chromatog. shows that decompn. is nonlinear with time and follows approx. 1st order kinetics.