Results 221 to 230 of about 7,759,429 (252)

Gas‐phase structure of polymer ions: Tying together theoretical approaches and ion mobility spectrometry

Mass Spectrometry Reviews, 2021
AbstractAn increasing number of studies take advantage of ion mobility spectrometry (IMS) coupled to mass spectrometry (IMS‐MS) to investigate the spatial structure of gaseous ions. Synthetic polymers occupy a unique place in the field of IMS‐MS. Indeed, due to their intrinsic dispersity, they offer a broad range of homologous ions with different ...
Quentin, Duez, Sébastien, Hoyas, Thomas, Josse, Jérôme, Cornil, Pascal, Gerbaux, Julien, De Winter   +5 more
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Cryogenic Ion Mobility-Mass Spectrometry: Tracking Ion Structure from Solution to the Gas Phase

Accounts of Chemical Research, 2016
Electrospray ionization (ESI) combined with ion mobility-mass spectrometry (IM-MS) is adding new dimensions, that is, structure and dynamics, to the field of biological mass spectrometry. There is increasing evidence that gas-phase ions produced by ESI can closely resemble their solution-phase structures, but correlating these structures can be ...
Kelly A, Servage, Joshua A, Silveira, Kyle L, Fort, David H, Russell   +3 more
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Gas-phase metalloprotein complexes interrogated by ion mobility-mass spectrometry

International Journal of Mass Spectrometry, 2009
Gas-phase biomolecular structure may be explored through a number of analytical techniques. Ion mobility-mass spectrometry (IM-MS) continues to prove itself as a sensitive and reliable bioanalytical tool for gas-phase structure determination due to intense study and development over the past 15 years.
Faull, Peter A., Korkeila, Karoliina E., Kalapothakis, Jason M., Gray, Andrew, McCullough, Bryan J., Barran, Perdita E.; id_orcid 0000-0002-7720-586X   +5 more
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Chemical modification of gas-phase cluster dynamics in ion mobility spectrometry

2022
In this work, the interactions of ions and neutral species in the gas phase are studied from selected points of view. These interactions are important in most analytical methods oper-ating at atmospheric pressure (AP) because they affect substance-specific properties such as the m/z ratio or ion mobility.
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Ion Mobility Spectrometry of Gas-Phase Ions from Laser Ablation of Solids in Air at Ambient Pressure

Applied Spectroscopy, 2007
A mobility spectrometer was used to characterize gas-phase ions produced from laser ablation of solids in air at 100 °C and at ambient pressure with a beam focused to a diameter of <0.2 mm at energy of 6 mJ/pulse and wavelength of 266 nm.
G A, Eiceman, D, Young, H, Schmidt, J E, Rodriguez, J I, Baumbach, W, Vautz, D A, Lake, M V, Johnston   +7 more
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Determination of Gas-Phase Ion Structures of Locally Polar Homopolymers Through High-Resolution Ion Mobility Spectrometry–Mass Spectrometry

Journal of the American Society for Mass Spectrometry, 2019
The strong synergy arising from coupling two orthogonal analytical techniques such as ion mobility and mass spectrometry can be used to separate complex mixtures and determine structural information of analytes in the gas phase. A tandem study is performed using two systems with different gases and pressures to ascertain gas-phase conformations of ...
Xi, Chen, Shannon A, Raab, Timothy, Poe, David E, Clemmer, Carlos, Larriba-Andaluz   +4 more
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Critical Examination of Gas-Phase Protein Conformation/Multimer Ion Formation by Electrospray Ion Mobility-Mass Spectrometry

Analytical Chemistry, 2013
The generally accepted view of protein structure in the gas-phase is that protein ions produced by electrospray ionization (ESI) exist in a number of different states, and the resulting charge state distribution (CSD) and ion mobility spectrum is interpreted as evidence for protein ions retaining some memory of solution-phase conformation.
Kent J, Gillig, Chung-Hsuan, Chen
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Evidence of Gas-Phase Attachment of Molecular Oxygen to Deprotonated Hydroquinone During Ion-Mobility Mass Spectrometry

Journal of the American Society for Mass Spectrometry, 2022
Gas-phase addition of dioxygen to certain ions is a well-known phenomenon in mass spectrometry. For this reaction to occur, the presence of a distonic radical site on the precursor ion is thought to be a prerequisite. Herein, we report that oxygen adduct formation can take place also with deprotonated hydroquinone, which in fact is an even-electron ...
Xiao Ding, Meenu Kumar, Zhaoyu Zheng, Arthur Lee, W. Scott Hopkins, Athula B. Attygalle   +5 more
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Gas-Phase Dopant-Induced Conformational Changes Monitored with Transversal Modulation Ion Mobility Spectrometry

Analytical Chemistry, 2016
The potential of a Transversal Modulation Ion Mobility Spectrometry (TMIMS) instrument for protein analysis applications has been evaluated. The Collision Cross Section (CCS) of cytochrome c measured with the TMIMS is in agreement with values reported in the literature. Additionally, it enables tandem IMS-IMS prefiltration in dry gas and in vapor doped
Meyer NA, Root K, Zenobi R, Vidal-de-Miguel G   +3 more
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Differentiating Parallel and Antiparallel DNA Duplexes in the Gas Phase Using Trapped Ion Mobility Spectrometry

The Journal of Physical Chemistry B, 2018
Deoxyribonucleic acids can form a wide variety of structural motifs which differ greatly from the typical antiparallel duplex stabilized by Watson-Crick base pairing. Many of these structures are thought to occur in vivo and may have essential roles in the biology of the cell.
David Butcher, Prem Chapagain, Fenfei Leng, Francisco Fernandez-Lima   +3 more
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