The reversed-phase liquid chromatographic separation of several hair dyes (diamines, aminophenols, phenols, etc.), using mobile phases containing 1,8-diaminoctane as new amine modifier and sodium heptansulfonate, is described. The combined effect of the amine and of the alkylsulfonate enabled very good separation of all the dyes studied. The proposed chromatographic system was found to be selective, rugged and therefore suitable for the reliable quality control of commercial permanent colorants.
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