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. 2020 Feb 8;21(3):1131. doi: 10.3390/ijms21031131

Figure 2.

Figure 2

Structures of ABTS, the protonated and oxidized forms, and their absorption spectra in water: (a) ABTS pH 7 (1), ABTS pH 1 (2), ABTS•+ radical cation (3), and ABTS2+ dication (4); (b) the kinetics of ABTS to ABTS•+ conversion with a radical initiator. Spectra are adopted from Venkatasubramanian et al. (1989) and Scott et al. (1993) [41,42]. Copyright 1994, reproduced with permission from John Wiley and Sons, and copyright 1993, reproduced with permission from the American Chemical Society, respectively.