Results 151 to 160 of about 5,630 (192)
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Analytical and Bioanalytical Chemistry, 2023
Over the last decade, applications of ion mobility-mass spectrometry (IM-MS) have exploded due primarily to the widespread commercialization of robust instrumentation from several vendors. Unfortunately, the modest resolving power of many of these platforms (~40-60) has precluded routine separation of constitutional and stereochemical isomers.
Shon P. Neal +5 more
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Over the last decade, applications of ion mobility-mass spectrometry (IM-MS) have exploded due primarily to the widespread commercialization of robust instrumentation from several vendors. Unfortunately, the modest resolving power of many of these platforms (~40-60) has precluded routine separation of constitutional and stereochemical isomers.
Shon P. Neal +5 more
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Recent progress in food flavor analysis using gas chromatography–ion mobility spectrometry (GC–IMS)
Food Chemistry, 2020Rapid, nondestructive, high-throughput testing and screening of volatile ingredients plays an important role in food flavor analysis. Gas chromatography-ion mobility spectrometry (GC-IMS) is a powerful technique for the separation and sensitive detection of volatile organic compounds.
Shuqi Wang, Haitao Chen, Baoguo Sun
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Journal of the American Society for Mass Spectrometry, 2021
Classical ion mobility spectrometers (IMS) operated at ambient pressure, often use atmospheric pressure chemical ionization (APCI) sources to ionize organic compounds. In APCI, reactant ions ionize neutral analyte molecules via gas-phase ion–molecule reactions. The positively charged reactant ions in purified, dry air are H3O+, NO+, and O2+•.
Christoph Schaefer +4 more
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Classical ion mobility spectrometers (IMS) operated at ambient pressure, often use atmospheric pressure chemical ionization (APCI) sources to ionize organic compounds. In APCI, reactant ions ionize neutral analyte molecules via gas-phase ion–molecule reactions. The positively charged reactant ions in purified, dry air are H3O+, NO+, and O2+•.
Christoph Schaefer +4 more
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Physical Chemistry Chemical Physics, 2009
Ion evaporation is an essential step in the formation of charged ions from electrosprays, yet many aspects of the process are poorly understood. The ion evaporation kinetics of the 1-ethyl-3-methyl-imidazolium+ (EMI+) based ionic liquids (ILs) EMI-BF4, EMI-bis(perfluoroethylsulfonyl)imide, EMI-bis(trifluoromethylsulfonyl)imide and EMI-tris ...
Christopher J, Hogan +1 more
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Ion evaporation is an essential step in the formation of charged ions from electrosprays, yet many aspects of the process are poorly understood. The ion evaporation kinetics of the 1-ethyl-3-methyl-imidazolium+ (EMI+) based ionic liquids (ILs) EMI-BF4, EMI-bis(perfluoroethylsulfonyl)imide, EMI-bis(trifluoromethylsulfonyl)imide and EMI-tris ...
Christopher J, Hogan +1 more
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Examination of some organic explosives by ion mobility spectrometry (IMS)
2005The increase in terrorist activities committed using explosives in recent years has generated the need for improved analytical methods that can accurately and quickly identify explosives and their residues. In this study such an analytical method is evaluated. In the first phase of the study, standard solutions and a standard mixture solution of TNT (2,
Seven, E, Calimli, A, Koyuncu, H
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Journal of the American Society for Mass Spectrometry, 2022
High Kinetic Energy Ion Mobility Spectrometers (HiKE-IMS) chemically ionize gaseous samples via reactant ions and separate the generated ions by their motion in a neutral gas under the influence of an electric field. Operation at reduced pressures of 10–40 mbar allows for reaching high reduced electric field strengths (E/N) of up to 120 Td.
Christoph Schaefer +3 more
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High Kinetic Energy Ion Mobility Spectrometers (HiKE-IMS) chemically ionize gaseous samples via reactant ions and separate the generated ions by their motion in a neutral gas under the influence of an electric field. Operation at reduced pressures of 10–40 mbar allows for reaching high reduced electric field strengths (E/N) of up to 120 Td.
Christoph Schaefer +3 more
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The Analyst, 2016
Ion mobility spectrometry is used for nanomaterial size distribution measurement without the need of electrospray based aerosolization.
Seongho, Jeon +3 more
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Ion mobility spectrometry is used for nanomaterial size distribution measurement without the need of electrospray based aerosolization.
Seongho, Jeon +3 more
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The Journal of Physical Chemistry A, 2006
The ion mobilities and their respective masses of several classes of amines (primary, secondary, and tertiary) were measured by electrospray ionization atmospheric pressure ion mobility time-of-flight mass spectrometry IM(tof)MS. The experimental data obtained were comparatively analyzed by the one-temperature kinetic theory of Chapman-Enskog.
Wes E, Steiner +2 more
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The ion mobilities and their respective masses of several classes of amines (primary, secondary, and tertiary) were measured by electrospray ionization atmospheric pressure ion mobility time-of-flight mass spectrometry IM(tof)MS. The experimental data obtained were comparatively analyzed by the one-temperature kinetic theory of Chapman-Enskog.
Wes E, Steiner +2 more
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Applications of ion mobility spectrometry (IMS) in the field of foodomics
Food Research International, 2013Abstract Several new and innovative applications of ion mobility spectrometry (IMS) and related technologies in the field of foodomics have emerged in the last decade. Among these are the assessment of food freshness or the degree of spoilage of muscle food products, the determination of the level of odorants in wine responsible for the “off flavor”,
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An ion mobility spectrometry/mass spectrometry (IMS/MS) study of the site of protonation in anilines
Structural Chemistry, 1990Ion mobility spectrometry (IMS) and IMS/MS techniques were used to differentiate between nitrogenprotonated and carbon-protonated anilines, both of which coexist under the conditions of the IMS. Analysis of the results led to the conclusion that the former species had lower mobilities than the latter. This was attributed mainly to charge delocalization
Zeev Karpas +2 more
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