Simple and sensitive quantification of glutathione hydropersulfide alkylated using iodoacetamide by high-performance liquid chromatography with post-column derivatization.
J Chromatogr B Analyt Technol Biomed Life Sci 2021;
1163:122516. [PMID:
33429128 DOI:
10.1016/j.jchromb.2020.122516]
[Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 11/24/2020] [Accepted: 12/18/2020] [Indexed: 11/30/2022]
Abstract
A novel analytical method was developed for the quantification of glutathione hydropersulfide (G-SSH) in biological samples by high-performance liquid chromatography (HPLC) with post-column derivatization. G-SSH was treated with iodoacetamide as an alkylating agent for 5 min at 37 °C, and the resultant acetamide-labeled G-SSH (G-SS-acetamide) was subjected to HPLC. After separation on a reversed-phase column, G-SS-acetamide was quantified by detection using a post-column reaction with orthophthalaldehyde under alkaline conditions. The standard G-SS-acetamide was synthesized through the S-S exchange reaction between oxidized glutathione and 2-mercaptoacetamide. It should be noted that some types of alkylating agents, including N-ethylmaleimide and monobromobimane, cleave the polysulfide chains of polysulfides that consist of glutathione, resulting in the production of alkylated G-SSHs. We confirmed that iodoacetamide did not enhance the cleavage of acetamide-labeled glutathione trihydropersulfide (G-SSS-acetamide). The lowest quantification limit was estimated to be 25 nM for G-SS-acetamide. This method can be useful for studying the dynamics of sulfane sulfur in glutathione-containing matrices.
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