Antioxidation and tyrosinase inhibition of polyphenolic curcumin analogs |
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Authors: | Du Zhi-Yun Jiang Yong-Fu Tang Zhi-Kai Mo Rong-Qing Xue Gui-Hua Lu Yu-Jing Zheng Xi Dong Chang-Zhi Zhang Kun |
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Affiliation: | Laboratory of Natural Medicine and Green Chemistry, School of Light Industry and Chemical Engineering, Guandgong University of Technology, Guangzhou, China. |
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Abstract: | A series of polyphenolic curcumin analogs were synthesized and their inhibitory effects on mushroom tyrosinase and the inhibition of 1,1-diphenyl-2-picryl-hydrazyl (DPPH) free radical formation were evaluated. The results indictated that the analogs possessing m-diphenols and o-diphenols exhibited more potent inhibitory activity on tyrosinase than reference compound rojic acid, and that the analogs with o-diphenols exhibited more potent inhibitory activity of DPPH free-radical formation than reference compound vitamin C. The inhibition kinetics, analyzed by Lineweaver-Burk plots, revealed that compounds B(2) and C(2) bearing o-diphenols were non-competitive inhibitors, while compounds B(11) and C(11) bearing m-diphenols were competitive inhibitors. In particular, representative compounds C(2) and B(11) showed no side effects at a dose of 2,000 mg/kg in a preliminary evaluation of acute toxicity in mice. These results suggest that such polyphenolic curcumin analogs might serve as lead compounds for further design of new potential tyrosinase inhibitors. |
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