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Poster Presentations
Day 3, June 24（Tue.）
Room P (Maesato East, Foyer, Ocean Wing)
- 3P-AM-44
Distinguishment of Terpenoids by Ambient Ionization CID Spectra
(Yokohama City Univ.)
oRenta Wakabayashi, Kanako Sekimoto
Terpenoids can be oxidized in the atmosphere and become precursors of secondary organic aerosols (SOA), which are harmful to the air quality and human health. Monoterpenoids have numerous structural isomers. Therefore, it is important to understand which monoterpenoids are present in the atmosphere and how efficiently SOAs can form. Most of previous studies for measurements of monoterpenoids have used gas chromatography mass spectrometry (GC/MS). Non-chromatography techniques to identify monoterpenoids on-site and/or in real time are lacking. In this study, we investigated whether terpenoid isomers can be distinguished without chromatography using collision-induced dissociation mass spectrometry combined with an atmospheric pressure corona discharge ionization technique, which allows real-time measurements of volatile compounds in air. Focusing on the ammonium ion adducts of monoterpenoids, we performed CID experiments on the ammonium ion
adducts [M+NH4]+. It was found that the ratios in relative intensities of the product ions originating from H2O or NH3 loss from the precursor ions depend on specific partial structures. These results suggested that protonated OH groups are easily substituted to protonated amino groups at allyl OH and tertiary OH groups, which can be useful for distinguishing terpenoids isomers.