The operational settings for the ESR equipment were: Microwave power 16 mW, sweep width 50.00 Gauss, sweep time 2 min, modulation width 1.25 Gauss, time constant 0.3 s. The height of first peak of the centerfield duplet relative to the height of the builtin Mn (II)-standard was calculated and used to quantify the relative concentrations of radical spin adducts in the meat samples.