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See Chinese contents: GB/T 35837-2018 GB/T 35837-2018: Determination of prohibited minoxidil in cosmetics -- High performance liquid chromatography
This Standard specifies the high-performance liquid chromatography for the determination of prohibited substance of minoxidil in the cosmetics. This Standard is applicable to the determination of minoxidil in the cosmetics, such as emulsions, creams, lotions and shampoos with hair care and growth functions. This Standard detection limit of minoxidil is 5mg/kg; while the quantitative limit is 10mg/kg.
