Chinese Journal of Applied Chemistry ›› 2017, Vol. 34 ›› Issue (1): 83-89.DOI: 10.11944/j.issn.1000-0518.2017.01.160094

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Inhibitory Effects of Dawson Type Polyoxometalates on Tyrosinase

LI Lilia,CHEN Bingnianb,DENG Yangyanga,XIE Lefanga,XING Ruia,WANG Lia*()   

  1. aCollege of Food and Biological Engineering,Jimei University,Xiamen,Fujian 361021,China
    bYanwu Affiliated Hospital of Zhongshan Hospital,Xiamen University,Xiamen,Fujian 361005,China
  • Received:2016-03-07 Accepted:2016-05-18 Published:2017-01-03 Online:2017-01-03
  • Contact: WANG Li
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21371072)

Abstract:

Tyrosinase is a complicated copper containing oxidoreductase that is common in microorganism, plants, animals and human body, which plays a crucial role in melanin biosynthesis. Currently researches about tyrosinase inhibitors are mostly focused on natural extracts and organism. However, inorganic Dawson type polyoxometalates as tyrosinase inhibitors have been less reported. Two kinds of Dawson type polyoxometalates were synthesized and characterized by ultraviolet spectroscopy and infrared spectral analysis. The inhibitory effects of H6[P2Mo18O62] and H8[P2Mo17Cr(OH2)O61](abbreviated to P2Mo18 and P2Mo17Cr, respectively) on mushroom tyrosinase were investigated by ultraviolet spectrophotometry and enzymatic kinetics methods. P2Mo18 and P2Mo17Cr have significant inhibitory effects on tyrosinase, and the IC50 values of P2Mo18 and P2Mo17Cr are (0.482±0.009) mmol/L and (0.503±0.011) mmol/L for diphenolase, respectively. Enzymatic kinetics analysis indicates that P2Mo18 and P2Mo17Cr are reversible and competitive inhibitor, and the inhibition constant of P2Mo18 and P2Mo17Cr are 0.212 mmol/L and 0.249 mmol/L, respectively. Considering of IC50 values and inhibition constants, the inhibitory effect of P2Mo18 is slightly better than that of P2Mo17Cr. In conclusion, P2Mo18 and P2Mo17Cr show effective antityrosinase activities. Compared with arbutin, P2Mo18 and P2Mo17Cr have much more inhibitory effects on the diphenolase activity of tyrosinase. This study may provide reference foundation for the further study of the tyrosinase inhibitors, and also offer useful information for the comprehensive utilization of polyoxometalates.

Key words: tyrosinase, inhibitor, polyoxometalates, diphenolase activity