4-Butylresorcinol is a phenol derivative which can inhibit tyrosinase with IC50 of 11.27 μM.
It shows that 4-Butylresorcinol (4-n-butylresorcinol) significantly inhibits melanin synthesis in a concentration-dependent manner. In addition, it is also found to inhibit the activity of tyrosinase, the rate-limiting melanogenic enzyme. 4-Butylresorcinol does not induce ERK, Akt activation, or MITF degradation, and has no effect on cAMP response element binding protein (CREB) phosphorylation, which stimulates MITF expression. 4-Butylresorcinol strongly reduces tyrosinase activity in a cell-free system. Moreover, 4-Butylresorcinol shows an additive effect in combination with hinokitiol, which reduces MITF expression[2].
[1]. Jiang Y, et al. Synthesis and biological evaluation of unsymmetrical curcumin analogues as tyrosinaseinhibitors. Molecules. 2013 Apr 3;18(4):3948-61. [2]. Kim DS, et al. Inhibitory effects of 4-n-butylresorcinol on tyrosinase activity and melanin synthesis. Biol Pharm Bull. 2005 Dec;28(12):2216-9.

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