Relaxation Behaviors of Free Radicals From γ-Irradiated Black Pepper Using Pulsed EPR Spectroscopy

Using electron paramagnetic resonance (EPR) spectroscopy, we revealed the relaxation behaviors of free radicals in γ-irradiated black pepper. Upon γ-irradiation, typical doublet peaks were detected. Relaxation times (T 1 and T 2) were observed using pulsed EPR. We found that T 1 and T 2 values varied with the γ-irradiation dose levels and these values showed a dependence on the dose level of the γ-irradiation treatment.