Fig. 3: Kinetic decay studies of nitroxides.

a Second-order kinetic reduction curves of nitroxides (2 mM) with sodium ascorbate (1.4 eq.) in PBS buffer/DMSO (1:1) at 291 K. Data points are the average of three runs, with error bars representing 2 × standard deviation. b Structures of nitroxides for kinetic studies. c Second-order rate constants k [M−1 s−1] for 2 mM piperidinyl nitroxides, derived from decay curves by fitting to a second-order kinetic rate law. See the SI, Figs. S11, S12, and Table S1 for further details.