演題概要

2P-40（1A-O1-1430）

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正負イオン衝突誘起解離質量分析(CID-MS)と誘導体化反応を用いたα-pinene酸化物の官能基の高精度解析

(横市大院生命ナノ)
^o福山大輔・ 関本奏子

α-Pinene (C₁₀H₁₆) are oxidized by ozone (O₃), hydroxyl radicals, and NO₃ radicals in the atmosphere. They can be converted to highly oxidized multifunctional organic compounds, which are significantly involved in secondary organic aerosol (SOA) formation. It is important for atmospheric chemistry to identify and quantify functional group of oxidation products of α-pinene. However, the structures of all oxidation products are still not understood. In this study, we investigated functional groups of the oxidation products of α-pinene by using a combined positive-/negative-ion atmospheric pressure corona discharge ionization (APCDI) without chromatography and collision-induced dissociation (CID) methods. We report neutral species dissociated by CID are related to the type of functional group and the protonation/deprotonation position. We identified functional groups of the actual oxidation products of α-pinene using this relationship. These results were confirmed by positive-ion ESI-CID-MS using derivatization reactions (oximation of carbonyls by O-(2,3,4,5,6-pentafluorobenzyl) hydroxylamine, methyl esterification of carboxylic acids by trimethylsilyl diazomethane, and acylation of alcohols by acetic anhydride).