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. 2014 Mar 28;9(3):e93065. doi: 10.1371/journal.pone.0093065

Figure 4. EPR signal of nitroxide free radicals that were formed by reacting cyclic hydroxylamines spin probe T-MH in the xanthine oxidase-superoxide-generating system containing xanthine oxidase 10 mU/ml, xanthine (100–400 μM), and DTPA (0.1 mM).

Figure 4

The efficiency of TM-H spin probe was compared to peak heights of standard TEMPO nitroxide concentrations. For the same concentrations of reacted xanthine and TEMPO, TM-H peak height slope was 1/14 as large.