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Product ions spectrum of positively charged (+4) precursor ion of Aβ42 (5 μg/mL) in acetonitrile:water (50: 50 with 0.1% NH4OH). Peptide was infused into the mass spectrometer with a syringe pump at 10 μL/min while the mixture of acetonitrile and water (50: 50) was delivered by LC pump (0.2 mL/min). The most abundant products of precursor ion m/z 1129.7 were: m/z 1079.1, 1107.4, and 1054.4.
