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. 2021 Aug 24;22(17):9145. doi: 10.3390/ijms22179145

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Time course of the tyrosinase-catalyzed oxidation of EQ 1 in the presence of NAC, CySH, or GSH. (a) HPLC analysis following the tyrosinase-catalyzed oxidation of EQ 1 in the presence of 3 mol eq. NAC at pH 6.8; (b) HPLC analysis following the tyrosinase-catalyzed oxidation of EQ 1 in the presence of 3 mol eq. CySH at pH 6.8; (c) HPLC analysis following the tyrosinase-catalyzed oxidation of EQ 1 in the presence of 3 mol eq. GSH at pH 6.8. The reaction was stopped by the addition of HClO₄. Data were obtained from averages of two independent experiments. Mono-A, mono-B, di-A, and di-B had retention times with decreasing order in each thiol adduct.