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Molecules 2013, 18(4), 3948-3961; doi:10.3390/molecules18043948
Article

Synthesis and Biological Evaluation of Unsymmetrical Curcumin Analogues as Tyrosinase Inhibitors

1,2, 1,3,* , 1, 1, 1, 1, 1 and 1,*
Received: 31 January 2013; in revised form: 14 March 2013 / Accepted: 22 March 2013 / Published: 3 April 2013
(This article belongs to the Section Medicinal Chemistry)
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Abstract: Synthesis and biological evaluation of unsymmetrical curcumin analogues (UCAs) have been achieved. Tyrosinase inhibitory activities were found for most of the prepared synthetic UCAs. Among them, compounds containing 4-hydroxyl-substituted phenolic rings with C-2/C-4- or C-3/C-4-dihydroxyl-substituted diphenolic rings were more active (IC50 = 1.74~16.74 μM) than 4-butylresorcinol and kojic acid, which suggested that the 4-hydroxyl groups in UCAs play a crucial role in tyrosinase inhibitory activities. The inhibition kinetics analyzed by Lineweaver-Burk plots revealed compounds 3c and 3i containing catecholic rings were mixed-competitive inhibitors, whereas compounds 3d and 3j containing resorcinolic rings were competitive inhibitors. The preliminary evaluation results of acute toxicity showed the representative 3d and 3j were non-toxic in mice dosed at 1,200 mg/kg. This research suggests that, with the advantage of being readily prepared small molecules, polyphenolic UCAs have the potential to develop into pharmacological inhibitors of tyrosinase.
Keywords: unsymmetrical curcumin analogues; synthesis; tyrosinase inhibitors; biological evaluation; inhibition kinetics unsymmetrical curcumin analogues; synthesis; tyrosinase inhibitors; biological evaluation; inhibition kinetics
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Jiang, Y.; Du, Z.; Xue, G.; Chen, Q.; Lu, Y.; Zheng, X.; Conney, A.H.; Zhang, K. Synthesis and Biological Evaluation of Unsymmetrical Curcumin Analogues as Tyrosinase Inhibitors. Molecules 2013, 18, 3948-3961.

AMA Style

Jiang Y, Du Z, Xue G, Chen Q, Lu Y, Zheng X, Conney AH, Zhang K. Synthesis and Biological Evaluation of Unsymmetrical Curcumin Analogues as Tyrosinase Inhibitors. Molecules. 2013; 18(4):3948-3961.

Chicago/Turabian Style

Jiang, Yongfu; Du, Zhiyun; Xue, Guihua; Chen, Qian; Lu, Yujing; Zheng, Xi; Conney, Allan H.; Zhang, Kun. 2013. "Synthesis and Biological Evaluation of Unsymmetrical Curcumin Analogues as Tyrosinase Inhibitors." Molecules 18, no. 4: 3948-3961.



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