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Poster Presentations
Day 3, June 24（Tue.）
Room P (Maesato East, Foyer, Ocean Wing)
- 3P-AM-34
Interpretation of ambient mass spectra of α-pinene
(Yokohama City Univ.)
oRen Ishihara, Kanako Sekimoto
Monoterpenes (C10H16), that are included as fragrance ingredients, are oxidized easily in the atmosphere due to their structural characteristics. Therefore, understanding how they alter in the atmosphere through oxidative reactions is important to have a better sense of the behavior of fragrance ingredients. Recently, ambient mass spectrometry has been widely used as a method to measure small amounts of volatile molecules in the air in real time. This technique contains atmospheric pressure plasma systems, and the compounds to be measured are possibly oxidized in a discharge field in an ion source, followed by ionization and analysis by mass spectrometry. Thus, it is important to distinguish between “oxidation in the air" and “oxidation in an ion source" in order to accurately interpret ambient mass spectra. In this study, a gas chromatography (GC) was connected to the front of an atmospheric pressure corona discharge ionization mass spectrometry (APCDI-MS), and α-pinene (one of the monoterpenes) was measured. From APCDI mass spectrum, not only the protonated molecule (C10H17+) but also ions with oxygen atoms attachment were observed. In addition, we could distinguish the origins of the formation of the oxigenated ions from the comparison of retention times with the C10H17+ ion using GC/APCDI-MS.