Quantification of 1,3-dimethylol-5,5-dimethylhydantoin and its decomposition products in cosmetics by high-performance liquid chromatography

► DMDM hydantoin is one of the most popular preservatives. ► We devised a new method for measuring DMDMH and its decomposition products. ► The method allows the analysis of DMDMH without the progress of decomposition. ► We can exactly determine the quantity of DMDMH and its decomposition products. ► The method enables the analysis of DMDMH in commercially available cosmetics.