Department of Chemistry
Gas chromatography–high-resolution mass spectrometry (GC–HRMS) is a powerful non-targeted screening technique that promises to accelerate the identification of environmental pollu-tants. Currently, most GC–HRMS instruments are equipped with electron ionization (EI), but atmospheric pressure ionization (API) ion sources have attracted renewed interest because: (i) colli-sional cooling at atmospheric pressure minimizes fragmentation, resulting in an increased yield of molecular ions for elemental composition determination and improved detection limits; (ii) a wide range of sophisticated tandem (ion mobility) mass spectrometers can be easily adapted for opera-tion with GC–API; and (iii) the conditions of an atmospheric pressure ion source can promote structure diagnostic ion–molecule reactions that are otherwise difficult to perform using conventional GC–MS instrumentation. This literature review addresses the merits of GC–API for nontargeted screening while summarizing recent applications using various GC–API techniques. One perceived drawback of GC–API is the paucity of spectral libraries that can be used to guide structure elucida-tion. Herein, novel data acquisition, deconvolution and spectral prediction tools will be reviewed. With continued development, it is anticipated that API may eventually supplant EI as the de facto GC–MS ion source used to identify unknowns.
Li, X.; Dorman, F.L.; Helm, P.A.; Kleywegt, S.; Simpson, A.; Simpson, M.J.; Jobst, K.J. Nontargeted Screening Using Gas Chromatography–Atmospheric Pressure Ionization Mass Spectrometry: Recent Trends and Emerging Potential. Molecules 2021, 26, 6911. https://doi.org/10.3390/molecules26226911
Dartmouth Digital Commons Citation
Li, Xiaolei; Dorman, Frank L.; Helm, Paul A.; Kleywegt, Sonya; Simpson, André; Simpson, Myrna J.; and Jobst, Karl J., "Nontargeted screening using gas chromatography– atmospheric pressure ionization mass spectrometry: Recent trends and emerging potential" (2021). Dartmouth Scholarship. 4166.