摘要Objective With the improvement of people's living standards,people's requests for beauty are increasing.Skin whitening and lightening have become the pursuit of many women,and whitening and removing freckles have become the focus of scientific research.At present,widely used whitening agents,such as kojic acid,vitamin C,and its derivatives,have shortcomings such as poor stability and retarded effect.Therefore,safer and more effective whitening products from herbs are urgently needed.To explore the possibility of triterpenes as whitening active substance,the effects of total triterpenes of Poria (TTP) and poricoic acid A (PAA) on mushroom tyrosinase activities and B16 cells were investigated,and their mechanisms on mushroom tyrosinase were also studied.Methods Using arbutin and nicotinamide as reference substances,we determinated the inhibitory effects of TTP and PAA on mushroom tyrosinase and tyrosinase in B16 cells and then studied the inhibitory mechanism on mushroom tyrosinase.Results TTP and PAA exhibited good inhibitory effects on the activities of monophenolase and diphenolase in mushroom tyrosinase,as well as a certain inhibitory effect on tyrosinase in B16 cells.Conclusion TTP and PAA are potential whitening active ingredients.