Synopsis A high pressure liquid chromatographic method is described for the determination of thioglycolic acid in hair waving fluids and depilatories. Prior to chromatography the acid is converted into a yellow-coloured nitrobenzooxadioazole (NBD) derivative to permit HPLC detection at 464 nm. Optimum derivatization conditions could be obtained when 0.01% aqueous solutions of thioglycolic acid were heated with NBD-C1 at pH 7. Hair waving fluids and depilatories are simply diluted with an aqueous buffer of pH 7 and, if necessary, clarified and filtered, before the derivatization procedure. To the mixture an internal standard Sunset Yellow FCF, Colour Index nr. 15985, is added before performing ion-pair reverse phase HPLC. A reverse phase C18 column is used. The mobile phase is aqueous methanol, to which the counter ion, tetrabutyl-ammonium phosphate, is added. Recoveries ranged from 97.8 to 100.7%. The proposed method permits a resolution of other possible mercaptocompounds such as thiolactic acid and thioglycerol. Sixty market samples of cold wave fluids and depilatories have been analysed by the proposed method, and the results compared with data obtained by iodometric titration.
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