title: Scavenging effect of butylated hydroxytoluene on the production of free radicals by the reaction of hydrogen peroxide with N-methyl-N'-nitro-N-nitrosoguanidine.
abstract: The scavenging effects of the antioxidant butylated hydroxytoluene (BHT) on a hydroxyl free radical (.OH) produced in the reaction of H2O2 with N-methyl-N'-nitro-N-nitrosoguanidine [(MNNG) CAS: 70-25-7] and on free radicals derived from MNNG (.MNNG) were examined by electron spin resonance with the use of the spin-trapping agent 5,5-dimethyl-1-pyrroline-1-oxide (DMPO). BHT was added to the H2O2-MNNG-DMPO system in 50% acetonitrile and exposed to a tungsten-halogen lamp at an intensity of 0.3 mW/cm2 for 3 minutes at 3 degrees C for the first 2 minutes of irradiation. The amounts of .OH and .MNNG in the system decreased and reached constant levels with increase in BHT concentration. The spectrum of the H2O2-MNNG-BHT system showed the specific signal of BHT, whereas the spectra of the BHT solution and the H2O2-MNNG system did not show any signal. These findings indicate that BHT scavenged .OH and .MNNG, and in its reaction with them formed a stable free radical.
mesh_terms: D002084:Butylated Hydroxytoluene; D055598:Chemical Phenomena; D002621:Chemistry; D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals; D006861:Hydrogen Peroxide; D008769:Methylnitronitrosoguanidine
chemical_list: D005609:Free Radicals; D008769:Methylnitronitrosoguanidine; D002084:Butylated Hydroxytoluene; D006861:Hydrogen Peroxide