Reference

High performance thin layer chromatographic identification of synthetic food dyes in alcoholic products

High performance thin layer chromatographic identification of synthetic food dyes in alcoholic products. Steele, John A. (Natl. Lab. Cent., Bur. Alcohol, Tobacco Firearms, Rockville, MD 20850, USA). J. Assoc. Off. Anal. Chem., 67(3), 540-1 (English) 1984. CODEN: JANCA2. ISSN: 0004-5756. DOCUMENT TYPE: Journal CA Section: 16 (Fermentation and Bioindustrial Chemistry) A high performance TLC system using 2 multicomponent solvent systems is described for the sepn. and identification of FD and C permitted dyes FD and C yellow No. 5 [1934-21-0], FD and C Yellow No. 6 [2783-94-0], FD and C Red No. 40 [25956-17-6], FD and C Red No. 3 [16423-68-0], FD and C Blue No. 1 [3844-45-9], FD and C Blue No. 2 [860-22-0], FD and C Green No. 3 [2353-45-9], FD and C delisted dyes for foods: Amaranth [915-67-3] formerly certified as FD and C Red No. 2, FD and C Red No. 1 [3564-09-8], D and C Red No. 4 [4548-53-2] (delisted for foods permitted for external drugs and cosmetics); D and C dyes D and C Yellow No. 10 [8004-92-0], D and C Green No. 5 [4403-90-1]. The method is suitable for the rapid monitoring of synthetic food dyes in alc. beverage products. Also, the method offers the means of qual. and quant. spectrodensitometry of synthetic food dyes found in alc. beverage products.

The radiation-induced degradation of anthraquinone dyes in aqueous solutions

The radiation-induced degradation of anthraquinone dyes in aqueous solutions. Nagai, Takeshi; Suzuki, Nobutake (Takasaki Radiat. Chem. Res. Establ., JAERI, Takasaki, Japan). Int. J. Appl. Radiat. Isot., 27(12), 699-705 (English) 1976. CODEN: IJARAY. DOCUMENT TYPE: Journal CA Section: 40 (Dyes, Fluorescent Whitening Agents, and Photosensitizers) Section cross-reference(s): 60 Aq. solns. of Acid Blue 40 [6424-85-7], Acid Green 25 [4403-90-1], Reactive Blue 4 [13324-20-4], and Reactive Blue 2 [12236-82-7] were easily decolored by gamma radiation in the presence of O. The decoloration reaction was promoted by addn. of hydrogen peroxide and nitrous oxide. In the nitrogen-satd. Acid Blue 40 soln., new adsorption bands appeared at 460-490 nm with the disappearance of the band at 610 nm and became more distinct by addn. of alcs. Such phenomena were not obsd. in the O-satd. soln. In the presence of enough O, the dye mols. after decoloration were degraded to lower mol. wt. compds., mainly org.Except for chemicals metioned above, 6424-85-7 and 7722-84-1 are also used. acids, and finally to CO2. .