Novel DMPO analogues attached to a phenyl group at the phosphorus atom were synthesized and examined for their abil- ity in the spin trapping of oxygen-centered radicals. The lipo- philicities of these analogues were higher than those of DMPO. ... Spin trapping studies have been applied to the detection of oxygen-centered radicals in biological processes.1 ... Table 1. These signals were inhibited by the presence of cata- lase (50 U/mL). ... The trapping of superoxide ...