Integrated X-band CW spectra at 20°C showing changes during the cleavage of dinitroxide I (0.5 mM) by glutathione (0.5 mM). Time 0 (
), 30 min (
), 60 min (
), 90 min (
), 120 min (
), 150 min (
), and 180 min (
) after adding glutathione. To obtain the limiting spectrum after 24 hr (
) the sample was stored at 4°C overnight. The spectra were scaled to constant amplitude for the highest peak.