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The aim of the present study is to preliminarily investigate the antimelanogenesis effect of  Inonotus obliquus  extracts by cell-free mushroom tyrosinase assay. It was found that petroleum ether and n-butanol extracts might contain unknown potential tyrosinase inhibitors, while its ethyl acetate extract might contain some unknown accelerators. Six compounds were isolated and their structures were identified by interpretation of NMR data and nicotinic acid was first discovered in  Inonotus obliquus . In cells testing, betulin and trametenolic acid decreased tyrosinase activity and melanin content, while inotodiol and lanosterol significantly increased tyrosinase activity and melanin content, showing an AC⁡ 50  of 9.74 and 8.43  μ M, respectively. Nicotinie acid, 3 β ,22,25-trihydroxy-lanosta-8-ene, had a little or no effect on tyrosinase. Betulin exhibited a mode of noncompetitive inhibition with a  K   I  =  K   IS  of 0.4  μ M on tyrosinase activity showing an IC 50  of 5.13  μ M and being more effective than kojic acid (6.43  μ M), and trametenolic acid exhibited a mode of mixed inhibition with a  K   I  of 0.9  μ M,  K   IS  of 0.5  μ M, and an IC 50  of 7.25  μ M. We proposed betulin and trametenolic acid as a new candidate of potent tyrosinase inhibitors and inotodiol and lanosterol as accelerators that could be used as therapeutic agent.

Inhibitory and Acceleratory Effects ofInonotus obliquuson Tyrosinase Activity and Melanin Formation in B16 Melanoma Cells