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Day 3, June 12（Wed.） Room P1 (Multipurpose Hall)・Room P2 (Conference Room 101+102)
- 3P-23
Negative Ion Mass Spectrometry of Ibuprofen and Its Analogues
(Yokohama City Univ.)
oHaruki Nagata, Kanako Sekimoto
Ibuprofen, a component of antipyretic analgesics, is an aromatic compound with a carboxyl group and is known to exist as ions in vivo. Since many pharmaceuticals contain carboxyl groups, it is expected that understanding the ion structures and stability of ibuprofen will contribute to develop pharmaceutical research. In this study, we measured ibuprofen and its analogues (aromatics with a carboxylic group) using an atmospheric pressure corona discharge ionization collision-induced dissociation mass spectrometry (APCDI-CID-MS) in negative-ion mode. We performed CID experiments on deprotonated molecules for individual analytes. As a result, it was found that there are two conditions to form negative ions with only C and H atoms: (1) stabilization by forming a double bond by 2H loss and broadening the resonance structure, so making it possible to eliminate CO2, and (2) stabilization by forming a benzyl anion at the α carbon of a carboxyl group or a methyl group via CO2 loss.