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Mass spectral analysis for [13C]spermine free radical scavenging experiments. (A) CI spectrum of bis-α-[13C]-enriched spermine standard. (B) CI mass spectral analysis of unknown products of free radical scavenging reaction. Mass spectroscopy was performed on a VG 7250S MicroMass spectrometer (MicroMass Corp., Manchester, U.K.) equipped with a direct chemical ionization (DCI) probe and using ammonia as the reagent gas.
