Abstract
An application of isotachophoresis (IP) method to the determination of A (thioglycolic acid and dithiodiglycolic acid in permanent waving lotions) and B (cysteine and thioglycolic acid in permanent waving lotions) has been studied.
In IP method, the calibration curves were linear over wide concentration ranges of thioglycolic acid, dithiodiglycolic acid and cysteine, and the simultaneous analyses of thioglycolic acid and dithiodiglycolic acid could be done, and the simultaneous analyses of cysteine and thioglycolic acid could be done too.
Permanent waving lotions were analyzed by IP method. The results were compared with those obtained by the standard testing method for permanent waving lotion.
It is found the present IP method is very simple, rapid, safe, highly reproducible and simultaneously analytical, and can be satisfactorily applied to the analysis of permanent waving lotions.
