本研究分別利用氣相層析電子撞擊式質譜儀(gas chromatography-electron ionization-mass spectrometry, GC-EI/ MS)以及飛秒雷射誘發多光子離子化飛行時間質譜儀(femtosecond laser-induced multiphoton ionization/time-of-flight mass spectrometry, FL-MPI/ TOFMS)研究並且比較非吸菸者／吸菸者呼吸氣體中成分的質譜資訊。藉由固相微萃取(solid phase microextraction, SPME)提升分析物訊號強度後，本研究能夠在人體呼氣樣品中檢測出40種以上的揮發性有機化合物(VOCs)其中有24種揮發性有機化合物可以被鑑定出來。GC-EI / MS利於偵測己烷(hexane)，乙脲(ethylurea)，甲苯(toluene)和檸烯(limonene)。相對的，FL-MPI/ TOFMS則利於偵測鄰二甲苯(o-xylene)，萘(naphthalene)和甲基丙基苯(methylpropyl benzene)等化合物。而有些化合物在兩種質譜儀中皆有被偵測到，例如丙酮(acetone)以及異戊二烯(isoprene)。除此之外，本研究亦利用FL-MPI/ TOFMS檢測同一名志願者吸菸後的呼氣樣品，發現其中含有有2,3-二甲基吡嗪(2,3-dimethly pyrazine)，2-甲基吡啶(2-methyl pyridine)和吡嗪(pyrazine)等化合物。GC-EI/MS和FL-MPI/TOFMS的組合，成功地為研究人體呼氣中的VOCs提供一種新的檢測方法。

Characteristic mass fragmentation of breathing gases from nonsmoker/smoker was investigated and compared by means of gas chromatography-electron ionization-mass spectrometry (GC-EI/MS) and femtosecond laser excited multiphoton ionization/time-of-flight mass spectrometry (FL-MPI/TOFM) methods, respectively. Solid phase microextraction (SPME) was used to improve the concentration levels. As a result, more than 40 types of volatile organic compounds (VOCs) in human breath were detected and 24 types of them were identified by database. The use of GC-EI/MS was useful for the detection of hexane, ethylurea, toluene, and limonene. In contrast to this, FL-MPI/TOFMS was useful for the detection of o-xylene, naphthalene, and methylpropyl benzene, etc. Some compounds were detected by either methods, including acetone and isoprene, etc. However, 2,3-dimethly pyrazine, 2-methyl pyridine, and pyrazines were found this time by FL-MPI/TOFM from the same volunteer after he smoked a cigarette. The combination of GC-EI/MS and FL-MPI/TOFMS was successfully to provide a new methodology for the study of VOCs from human breath.

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