Development and Application of a Chemical Ionization Focusing Integrated Ionization Source TOFMS for Online Detection of OVOCs in the Atmosphere [PDF]
Molecules, 2023 Single photon ionization (SPI) based on vacuum ultraviolet (VUV) lamps has been extensively investigated and applied due to its clean mass spectra as a soft ionization method. However, the photon energy of 10.6 eV and photon flux of 1011 photons s−1 of a
Ruidong Liu +5 more
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Automatic Assignment of Molecular Ion Species to Elemental Formulas in Gas Chromatography/Methane Chemical Ionization Accurate Mass Spectrometry [PDF]
Metabolites, 2023 Gas chromatography–mass spectrometry (GC-MS) usually employs hard electron ionization, leading to extensive fragmentations that are suitable to identify compounds based on library matches.
Shunyang Wang +3 more
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Positive Effect of Acetylation on Proteomic Analysis Based on Liquid Chromatography with Atmospheric Pressure Chemical Ionization and Photoionization Mass Spectrometry [PDF]
Molecules, 2023 A typical bottom-up proteomic workflow comprises sample digestion with trypsin, separation of the hydrolysate using reversed-phase HPLC, and detection of peptides via electrospray ionization (ESI) tandem mass spectrometry. Despite the advantages and wide
Simona Sedláčková +5 more
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Differentiating the aromatic positional isomers of methylbuphedrones and methoxybuphedrones via chemical ionization‐mass spectrometry [PDF]
Analytical Science AdvancesDiscrimination of aromatic positional isomers of methylbuphedrones and methoxybuphedrones was successfully achieved. Meta isomers were discriminated by chemical ionization‐tandem mass spectrometry (CI‐MS/MS) using acetonitrile as a reagent gas ...
Shinji Tsunoi +4 more
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Agriculture, 2023 N-nitrosamines are a class of carcinogenic chemical compound. Considering the large-scale application of agrochemicals globally, the elimination of N-nitrosamines from pesticides should be a priority for manufacturers and regulators. A set of methods was
George P. Balayiannis, Helen Karasali
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Mass spectrometry analysis of polychlorinated biphenyls: chemical ionization and selected ion chemical ionization using methane as a reagent gas [PDF]
Journal of the Serbian Chemical Society, 2000 In the present paper a quadrupole ion trap mass spectrometer, coupled with a gas chromatograph, was used to compare the electron impact ionization (EI) and chemical ionization (Cl) technique, in terms of their selectivity in polychlorinated biphenyls ...
RAYMOND E. MARCH +2 more
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GC Analysis of Seven Seed Oils Containing Conjugated Fatty Acids
Separations, 2021 The fatty acid compositions, including isomer compositions, of seven seed oils containing conjugated fatty acids (CFA) were determined. Seed oils were extracted using a modified Folch extraction, converted to fatty acid methyl esters, and analyzed by gas
Robert Goldschmidt, William Byrdwell
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Analytica, 2023 Here, we present proof of principle studies to demonstrate how the product ions associated with the ion mobility peaks obtained from a High Kinetic Energy-Ion Mobility Spectrometer (HiKE-IMS) measurement of a volatile can be identified using a Proton ...
Florentin Weiss +4 more
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Clustering, methodology, and mechanistic insights into acetate chemical ionization using high-resolution time-of-flight mass spectrometry [PDF]
Atmospheric Measurement Techniques, 2016 We present a comprehensive characterization of cluster control and transmission through the Tofwerk atmospheric pressure interface installed on various chemical ionization time-of-flight mass spectrometers using authentic standards. This characterization
P. Brophy, D. K. Farmer
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Разработка и регистрация лекарственных средств, 2021 Introduction. Gestobutanoil is a synthetic pregnane steroid with gestagenic activity. Gestobutanoil has two pharmacologically active metabolites (AMOL and megestrol acetate). This implies the need for a detailed study of the kinetics of metabolites.
E. S. Stepanova +4 more
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