Collisional Activation Mass Spectra of M(1-.) Ions of Azo Dyes Containing 2-Naphthol

摘要

Collisionally activated decomposition mass spectra of M- ions of azo dyes are presented. The compounds are of general structure Ar(1)-N=N-Ar(2), where Ar(1) is substituted phenyl and Ar(2) is 2-naphthol. Characteristic fragment ions observed include m/z 157, which corresponds to the 2-naphthol substituent with cleavage of the -N=N- bond represented as (AR(2) -N)-. Ions of general structure (Ar(1) -NH)- are also observed. Parent ion scans of m/z 157 provide a potential screening technique for 2-naphthol-containing azo dyes. Specific results are reported for the chloroform extract of FD&C Red No.8, and capillary gas chromatographic introduction is compared with direct exposure probe introduction for the identification of dyes. (Copyright 1988 by John Wiley & Sons, Ltd.)