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High resolution LC-MS/MS of (a) AFB2a-Lys, (b) I; AFB1-Lys, (c) II; AFB1-Lys+O and (d) III; AFB1-Lys+O-2H. MS/MS dissociation pathways (b–d) show multiple product ions are formed, whereas the AFB2a-Lys, which does not possess a oxidized pyrrole ring, has one major product ion, that results from the loss of both H2CO2 and NH3 from the lysine amino acid. All compounds have a m/z 84.0814 product ion derived from the Lys residue.
