Citation:
ZHENG Aping, CHEN Bingnian, CHEN Fahe, WANG Li. Inhibition Effect of Vanadate-replaced Polyoxometalates on Mushroom Tyrosinase[J]. Chinese Journal of Applied Chemistry,
;2013, 30(2): 165-170.
doi:
DOI:10.3724/SP.J.1095.2013.20160
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Three kinds vanadate-replaced polyoxometalates,α-1,2,3-K6H[SiW9V3O40],α-1,2-K6[SiW10V2O40] and α-K5[SiW11VO40](abbreviated as α-SiW9V3,α-SiW10V2,α-SiW11V) were synthesized and evaluated as tyrosinase inhibitors using the enzymological kinetic method.The results demonstrate that α-SiW9V3 can inhibit tyrosinase strongly,as demonstrated by the inhibition of the steady-state activity of the enzyme and the lengthening of the lag time.The IC50 of α-SiW9V3 was estimated to be 0.6841 mmol/L for the inhibition of mushroom tyrosinase.It resulted in the lag time of the monophenolase extension from 235 s to 650 s with 0.7 mmol/L of α-SiW9V3.The inhibition of α-SiW9V3 on monophenolase of mushroom tyrosinase proceeds as reversible process,and the inhibition of α-SiW9V3 is a competitive-uncompetitive mixed-Ⅱ type due to the oxidation of L-tyrosine.The inhibition constants(KI and KIS) are determined to be 4.22 mmol/L and 2.39 mmol/L,respectively.As for the α-SiW10V2,however,it is unsoluble in DMSO buffer,and its effect on the mushroom tyrosinase cannot be studied.While the inhibition ability of α-SiW11V on tyrosinase activity is rather weak.
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