Chinese Journal of Applied Chemistry ›› 2018, Vol. 35 ›› Issue (4): 436-441.DOI: 10.11944/j.issn.1000-0518.2018.04.170130

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Inhibitory Effect of Vanadium-Substituted Dawson Type Phosphomolybdic Acid on Tyrosinase

Lili LI,Yangyang DENG,Lefang XIE,Li WANG()   

  1. College of Food and Biological Engineering,Jimei University,Xiamen,Fujian 361021,China
  • Received:2017-04-24 Accepted:2017-08-22 Published:2018-03-30 Online:2018-04-02
  • Contact: Li WANG
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21371072)

Abstract:

In this paper, the inhibitory effects of five Dawson type phosphomolybdic acids, e.g., H7[P2Mo17VO62], H8[P2Mo16V2O62], H9[P2Mo15V3O62], H8[P2Mo14V4O62H2] and H9[P2Mo13V5O62H2](abbreviated to P2Mo17V, P2Mo16V2, P2Mo15V3, P2Mo14V4 and P2Mo13V5, respectively), on the diphenolase activity of mushroom tyrosinase were investigated by enzyme kinetics methods. The results show that P2Mo17V, P2Mo16V2 and P2Mo15V3 have significant inhibitory effects on tyrosinase, and the half maximal inhibitory concentration(IC50) values of them are 0.409, 0.386 and 0.386 mmol/L, respectively. They are reversible and competitive inhibitors, and the inhibition constants are 0.234, 0.391 and 0.249 mmol/L, respectively. P2Mo13V5 can activate diphenolase activity of tyrosinase while P2Mo14V4 in 0~1.0 mmol/L has no obvious effects on the diphenolase activity of tyrosinase.

Key words: tyrosinase, inhibitor, phosphomolybdic acid, diphenolase activity