Figure 3: Amplitudes (A) and linewidths (ΔBpp) of EPR spectra of streptomycin (a), gentamicin (b), neomycin (c), sisomicin (d), paromomycin (e), and tobramycin (f), sterilized at 160°C (120 minutes), 170°C (60 minutes), and 180°C (30 minutes). The EPR spectra were measured with microwave power of 2.2 mW at room temperature 20 minutes after sterilization.