Abstract
Atmospheric pressure chemical ionization tandem mass spectrometry was used to study the gas-phase reactions of protonated α- and β-aspartame. The results show that under collision-induced dissociation conditions, these ions undergo dehydration to form anhydro derivatives in addition to carbon–carbon bond cleavages. The fragment ions formed from these dissociation pathways can be used to distinguish the two isomers. Specifically, ions at m/z 175 and 88 are unique to protonated α-aspartame whereas ions at m/z 249, 189 and 74 are unique to protonated β-aspartame. © 1998 John Wiley & Sons, Ltd.
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