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- W2992137516 abstract "ABTS, 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonate), is a common chromogenic substrate for peroxidase enzymes, which are widely used in biochemical research and diagnostic tests. We discovered that impurities in the commercially available ABTS significantly affect the results of peroxidase activity assays. We show that the impurities inhibit the activity of the peroxidases and the influence varies for different batches of ABTS from the same source. The inhibition of horseradish peroxidase (HRP) is uncompetitive for the substrate H2O2 while it is competitive for the substrate ABTS. By using high-resolution mass spectrometry, potential inhibitors were identified to be precursors or analogs of ABTS. The inhibitors are also capable of inhibiting the GOx-catalyzed reduction of the ABTS radical cation by glucose in anaerobic conditions. As the inhibition is found to be pH-dependent, diagnostic applications, such as ELISA tests based on the peroxidase-H2O2-ABTS system, should be carried out at pH 4.4 to minimize the inhibitory effect of potentially present impurities." @default.
- W2992137516 created "2019-12-13" @default.
- W2992137516 creator A5009700587 @default.
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- W2992137516 date "2019-12-04" @default.
- W2992137516 modified "2023-10-18" @default.
- W2992137516 title "Inhibitors in Commercially Available 2,2′-Azino-bis(3-ethylbenzothiazoline-6-sulfonate) Affect Enzymatic Assays" @default.
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- W2992137516 doi "https://doi.org/10.1021/acs.analchem.9b04751" @default.
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