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In the present work, we developed an UV-absorptive and highly reactive tag aromatic molecule, quinoline-5,8-dione (QLD), for robust quantitative analysis of GSH by matrix-assisted laser desorption/ionization (MALDI) mass spectrometry. The QLD could react with GSH with high efficiency at room temperature, and the resultant QLD-GSH conjugate could be readily detected by MALDI MS without interferences...
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