✦ LIBER ✦

Atmospheric pressure chemical ionization tandem mass spectra of α- and β-aspartame

✍ Scribed by Qin, Xue-Zhi

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 349 KB
Volume: 33
Category: Article
ISSN: 1076-5174
DOI: 10.1002/(sici)1096-9888(199801)33:1<55::aid-jms609>3.0.co;2-a

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✦ Synopsis

Atmospheric pressure chemical ionization tandem mass spectrometry was used to study the gas-phase reactions of protonated a-and b-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. SpeciÐcally, ions at m/z 175 and 88 are unique to protonated a-aspartame whereas ions at m/z 249, 189 and 74 are unique to protonated b-aspartame.

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