Identification and determination of unknown subsidiary colors in commercial Food Green No.3 (Fast Green FCF, FD&C Green No. 3)

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  • 市販食用緑色3号中の付随色素の同定と定量

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Abstract

Three subsidiary colors (Sub-A, Sub-B, and Sub-E) were isolated from commercial Food Green No. 3 (G-3) by using preparative HPLC and their structures were determined by MS and NMR. The structures of Sub-A, Sub-B, and Sub-E were the disodium salt of 2-[[4-[N-ethyl-N-(3-sulfophenylmethyl)amino]phenyl][4-[N-(3-sulfophenylmethyl)amino]phenyl]methylio]-4-hydroxybenzenesulfonic acid [abbreviated as HSBA-(m-BASA) (m-EBASA)], the disodium salt of 2-[bis[4-[N-ethyl-N-(4-sulfophenylmethyl)amino]phenyl]methylio]-4-hydroxybenzenesulfonic acid (abbreviated as p,p-G-3), and the disodium salt of 2-[[4-[N-ethyl-N-(2-sulfophenylmethyl)amino]phenyl][4-[N-ethyl-N-(3-sulfophenylmethyl)amino]phenyl]methylio]-4-hydroxybenzenesulfonic acid (abbreviated as o,m-G-3), respectively. HPLC analyses revealed that the contents of seven subsidiary colors (Sub-A, B, C, E, F, G, and H) including the four subsidiary colors (Sub-C, F, G, and H) reported previously in 4 commercial G-3 products were 0.45〜1.20%, 0.19〜2.60%, 8.49〜27.0%, 0.05〜1.52%, 1.15〜2.37%, 0.05〜0.22%, and ND〜0.24%, respectively.

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