Structural determination of the subsidiary colors in food blue No.1 (Brilliant blue FCF) aluminum lake detected by paper chromatography
2001
Tsuji, S. (National Inst. of Hygienic Sciences, Osaka (Japan). Osaka Branch) | Amakura, Y. | Umino, Y. | Nishi, M. | Nakanishi, T. | Tonogai, Y.
One of eight Food Blue No.1 aluminum lakes (B-1Als) used in the official inspection of coal-tar colors in fiscal year 1999 had a violet sub-spot during paper chromatography and was rejected. To clarify the orgin of the sub-spot, the violet subsidiary color (Sub-V) was isolated from the sample. On the basis of NMR and MS analyses and ion chromatography, the structure of the subsidiary color was elucidated to be 2-[[4-[Nu-ethyl-Nu-(3-sulfophenylmethyl)amino]phenyl][4-hydroxyphenyl]methylio]benzenesulfonic acid. The relative content of Sub-V to that of m, m-B-1 in the rejected sample was determined to be 39.5% by HPLC. The relative contents in other submitted samples of B-1Al were in the range of 1.1 - 3.6%.
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