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Atmospheric pressure chemical ionization tandem mass spectra of α‐ and β‐aspartame
Author(s) -
Qin XueZhi
Publication year - 1998
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/(sici)1096-9888(199801)33:1<55::aid-jms609>3.0.co;2-a
Subject(s) - chemistry , aspartame , tandem mass spectrometry , protonation , chemical ionization , dissociation (chemistry) , ion , atmospheric pressure chemical ionization , mass spectrometry , mass spectrum , collision induced dissociation , ionization , atmospheric pressure , tandem , photochemistry , analytical chemistry (journal) , computational chemistry , organic chemistry , chromatography , biochemistry , oceanography , materials science , composite material , geology
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.