（1）合成和表征了七种Dawson型的磷钼酸（P2Mo17Ni、P2M

(1) Seven Dawson-type phosphomolybdic acids (P2Mo17Ni, P2Mo17Cr, P2Mo17Co, P2Mo17Mn, P2Mo17Cu, P2Mo17Zn, P2Mo18) were synthesized and characterized, and the effects of aqueous solutions of seven polyacid compounds on tyrosinase were studied by electrochemical methods. Electrochemical sensing and its detection of tyrosinase in Penaeus vannamei. The experimental results show that the seven polyacid compounds have good electrochemical sensing for tyrosinase, and the detection effect of P2Mo17Ni is the best among the seven compounds. According to the chronoamperometric curve, when the concentration of tyrosinase is in the range of 3.66 U•mL-1 ~26.87 U•mL-1, the lowest detection limit (S/N=3) of P2Mo17Ni for tyrosinase can reach 0.4095 U•mL-1. This method was applied to the detection of tyrosinase content in Penaeus vannamei, and the sample recovery rate was 98.0477% to 99.5872%, and the selectivity of this method was good. When tyrosinase coexisted with multiple interfering substances , The test results are almost unaffected. It shows that the modified electrode has high accuracy and stability.

(1) Seven Dawson-type phosphates (P2Mo17Ni, P2Mo17Cr, P2Mo17Co, P2Mo17Mn, P2Mo17Cu, P2Mo17Zn, P2Mo17Zn, P2Mo1Mo18) were synthesized and characterized, and the electrochemical sensing of tyrosine enzymes in tyrosine enzymes was studied by electrochemical methods. The experimental results show that the detection effect of P2Mo17Ni is the best of the seven compounds, which have good electrochemical sensing on tyrosine enzymes. As can be known from the timing ampere curve, the minimum detection limit of P2Mo17Ni for tyrosine enzymes (S/N=3) can reach 0.4095 U-mL-1 when the concentration of tyrosine enzymes is in the range of 3.66 U.mL-1 to 26.87 U.mL-1. This method was applied to the detection of tyrosine enzyme content in White Shrimp in South America, the sample's label recovery rate was 98.0477% to 99.5872%, and the selectivity of this method was good, when tyrosinease coexisted with a variety of interfering substances, its detection results were almost unaffected. It is stated that the modified electrode has high accuracy and stability.

(1) Seven Dawson type phosphomolybdic acids (p2mo17ni, p2mo17cr, p2mo17co, p2mo17mn, p2mo17cu, p2mo17zn, p2mo18) were synthesized and characterized. The electrochemical sensing of tyrosinase and the detection of tyrosinase in Penaeus vannamei were studied by electrochemical method. The results showed that all the seven compounds had good electrochemical sensing properties for tyrosinase, and the detection effect of p2mo17ni was the best among the seven compounds. The lowest detection limit (s / N = 3) of p2mo17ni for tyrosinase was 0.4095 u · ml-1 when the concentration of tyrosinase was in the range of 3.66 u · ml-1 ~ 26.87 u · ml-1. This method was applied to the determination of tyrosinase in Penaeus vannamei. The recoveries were 98.0477% ～ 99.5872%, and the selectivity of this method was good. When tyrosinase coexisted with a variety of interfering substances, the detection results were almost unaffected. It shows that the modified electrode has high accuracy and stability.<br>