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. 2020 Mar 6;11:81. doi: 10.3389/fphar.2020.00081

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Copyright © 2020 Chen, Ye, Ran, Li, Ruan and Jin

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Inhibition mechanism of HgCl₂ on tyrosinase. (A) An irreversible inhibition of the enzyme on a kinetic basis: the concentrations of HgCl₂ were 0, 4.17, 16.67, 33.33, and 66.67 μmol/L for curves, and the concentrations of tyrosinase were 6.67, 13.33, 20, 26.67, and 33.33 U/mL. (B) Immobilized tyrosinase for analysis of inhibitory mechanism: As a negative control, the activity of tyrosinase with PBS treatment was defined as 100%, and the concentration of kojic acid and HgCl₂ were both 666.67 μmol/L. The experiment was repeated three times (n = 3).