Proton transfer reactions of halogenated compounds: Using gas chromatography/Fourier transform ion cyclotron resonance mass spectrometry (GC/FT-ICR MS) and ab initio calculations

Silwal, Indira K. C.; Rasaiah, Jayendran C.; Szulejko, Jan E.; Solouki, Touradj

doi:10.1016/j.ijms.2010.03.003

Cited by 7 publications

(1 citation statement)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A South American crude oil was dissolved at concentrations of 0.05, 0.175, and 0.300 mg mL –1 in mixtures of toluene and propan-2-ol for the DoE study. Polarity indices, solvent groups, pKa values, vapor pressures, boiling points, proton affinities, and ionization efficiencies − of the solvents used in this study are shown in Table S1.…”

Section: Methodsmentioning

confidence: 99%

Solvent and Flow Rate Effects on the Observed Compositional Profiles and the Relative Intensities of Radical and Protonated Species in Atmospheric Pressure Photoionization Mass Spectrometry

et al. 2022

View full text Add to dashboard Cite

Sample preparation and instrument parameters have regularly been demonstrated to impact upon the observed results in atmospheric pressure photoionization, mass spectrometry (MS), and analytical techniques in general but may be overlooked when such methods are applied to the characterization of real-world samples. An initial investigation into different solvent systems demonstrated that the inclusion of ethyl acetate inverted the ratio of relative intensities of radical and protonated species (R/P). Design of experiments was performed and indicated that the injection flow rate is also a significant factor. The impact of the solvent system and flow rate on signal intensity, the observed compositional profile, and R/P of selected molecular groups is demonstrated further. An inversion of R/P is observed at higher flow rates in solvent systems commonly used in petroleomics studies, effecting a loss of molecular speciation. The findings presented reiterate the critical importance in considering experimental parameters when interpreting the results of analytical procedures.

show abstract

Section: Methodsmentioning

confidence: 99%

Solvent and Flow Rate Effects on the Observed Compositional Profiles and the Relative Intensities of Radical and Protonated Species in Atmospheric Pressure Photoionization Mass Spectrometry

et al. 2022

View full text Add to dashboard Cite

show abstract

Current literature in mass spectrometry

2010

J. Mass Spectrom.

View full text Add to dashboard Cite

Atmospheric pressure chemical ionization mass spectrometry at low flow rates: Importance of ion source housing

Strmeň

Vrkoslav

Bosáková

et al. 2020

Rapid Comm Mass Spectrometry

View full text Add to dashboard Cite

RationaleHyphenation of atmospheric pressure chemical ionization (APCI) mass spectrometry with capillary and micro high‐performance liquid chromatography (HPLC) is attractive for many applications, but reliable ion sources dedicated to these conditions are still missing. There are a number of aspects to consider when designing such an ion source, including the susceptibility of the ionization processes to ambient conditions. Here we discuss the importance of ion source housing for APCI at low flow rates.MethodsSelected compounds dissolved in various solvents were used to study ionization reactions at 10 μL/min flow rate. APCI spectra were generated using the Ion Max‐S source (Thermo Fisher Scientific) operated with or without the ion source housing.ResultsThe APCI spectra of most compounds measured in the open and enclosed ion sources were markedly different. The differences were explained by water and oxygen molecules that entered the plasma region of the open ion source. Water tended to suppress charge transfer processes while oxygen diminished electron capture reactions and prevented the formation of acetonitrile‐related radical cations useful for localizing double bonds in lipids. The effects associated with the ion source housing were significantly less important for compounds that are easy to protonate or deprotonate.ConclusionsThe use of ion source housing prevented alternative ionization channels leading to unwanted or unexpected ions. Compared with the conventional flow rate mode (1 mL/min), the effects of ambient air components were significantly higher at 10 μL/min, emphasizing the need for ion source housing in APCI sources dedicated to low flow rates.

show abstract

Proton transfer reactions of halogenated compounds: Using gas chromatography/Fourier transform ion cyclotron resonance mass spectrometry (GC/FT-ICR MS) and ab initio calculations

Cited by 7 publications

References 62 publications

Solvent and Flow Rate Effects on the Observed Compositional Profiles and the Relative Intensities of Radical and Protonated Species in Atmospheric Pressure Photoionization Mass Spectrometry

Solvent and Flow Rate Effects on the Observed Compositional Profiles and the Relative Intensities of Radical and Protonated Species in Atmospheric Pressure Photoionization Mass Spectrometry

Current literature in mass spectrometry

Atmospheric pressure chemical ionization mass spectrometry at low flow rates: Importance of ion source housing

Contact Info

Product

Resources

About