Determination of 1-hydroxyethyl-4,5-diaminopyrazole sulfate and other 10 kinds of ingredients in cosmetics

This method specifies the determination of 1-hydroxyethyl-4,5-diaminopyrazole sulfate and other 10 ingredients in cosmetics by high-performance liquid chromatography (HPLC). This method is applicable to the determination of 1-hydroxyethyl-4,5-diaminopyrazole sulfate and other 10 ingredients in hair dye cosmetics. Cosmetic ingredients may exist in various forms, such as sulfates, hydrochlorides, etc. When multiple forms coexist, they shall be uniformly calculated in one form. The 11 ingredients covered by this method include: 1-hydroxyethyl-4,5-diaminopyrazole sulfate, hydroxyethyl-p-phenylenediamine sulfate, tetraaminopyrimidine sulfate, 1,3-bis-(2,4-diaminophenoxy)propane hydrochloride, HC Red No. 3, Disperse Black 9, 2-amino-6-chloro-4-nitrophenol, Basic Red 76 (CI 12245), hydroxypropyl bis(N-hydroxyethyl-p-phenylenediamine) hydrochloride, 2,6-dimethoxy-3,5-pyridinediamine hydrochloride, and 6-methoxy-2-methylamino-3-aminopyridine hydrochloride (HC Blue No. 7).