Simultaneous determination of arbutin and its decomposed product hydroquinone in whitening creams using high‐performance liquid chromatography with photodiode array detection: Effect of temperature and pH on decomposition

The developed method is simple to detect both arbutin and hydroquinone simultaneously in cosmetic products, at an adequate level of sensitivity. Notably, temperature and pH did not influence the decomposition of arbutin to hydroquinone in a 2% arbutin cream.