Results 241 to 250 of about 38,846 (279)
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Probe-Substrate Distance Control in Desorption Electrospray Ionization
Journal of the American Society for Mass Spectrometry, 2017We introduce probe-substrate distance (Dps)-control to desorption electrospray ionization (DESI) and report a systematic investigation of key experimental parameters. Examination of voltage, flow rate, and nebulizing gas pressure suggests as Dps decreases, the distance-dependent spray current increases, until a critical point. At the critical point the
Tyler J, Yarger +2 more
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Desorption electrospray ionization mass spectrometry of intact bacteria
Journal of Mass Spectrometry, 2007AbstractDesorption electrospray ionization (DESI) mass spectrometry (MS) was used to differentiate seven bacteria species on the basis of their measured DESI‐mass spectral profile. Both gram‐positive and gram‐negative bacteria were tested and included Escherichia coli, Staphyloccocus aureus, Enterococcus sp., Bordetella bronchiseptica, Bacillus ...
Mohammed A, Meetani +4 more
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Applied Spectroscopy, 2010
Electrospray ionization (ESI) and desorption electrospray ionization (DESI) mass spectrometry were for the first time compared to investigate degradation products resulting from radiolysis of polyurethane (PUR) irradiated using accelerated electrons. First, DESI optimization was performed to obtain the best results in terms of sensitivity for surface ...
Nicolas, Bonnaire +4 more
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Electrospray ionization (ESI) and desorption electrospray ionization (DESI) mass spectrometry were for the first time compared to investigate degradation products resulting from radiolysis of polyurethane (PUR) irradiated using accelerated electrons. First, DESI optimization was performed to obtain the best results in terms of sensitivity for surface ...
Nicolas, Bonnaire +4 more
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Chemical Imaging with Desorption Electrospray Ionization Mass Spectrometry
2010Desorption electrospray ionization mass spectrometry (DESI-MS) is a relatively new ambient surface analysis method. This technique requires little or no sample preparation prior to the actual analysis. Along with other application areas, DESI-MS is used to obtain chemical images of different biomolecules in biological tissue sections.
Vilmos, Kertesz, Gary J, Van Berkel
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Droplet Dynamics and Ionization Mechanisms in Desorption Electrospray Ionization Mass Spectrometry
Analytical Chemistry, 2006A droplet pickup and other mechanisms have been suggested for the ionization of biomolecules like peptides and proteins by desorption electrospray ionization. To verify this hypothesis phase Doppler particle analysis was used to study the sizes and velocities of droplets involved in DESI.
Andre, Venter +2 more
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Delayed Desorption Improves Protein Analysis by Desorption Electrospray Ionization Mass Spectrometry
Journal of the American Society for Mass Spectrometry, 2020Protein analysis by desorption electrospray ionization mass spectrometry (DESI-MS) is limited and often accompanied by a mass-dependent loss in sensitivity as protein molecular weight increases. Previously, incomplete dissolution was identified as a potential contributing factor to this limitation for larger proteins.
Tara L. Maser +2 more
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Journal of Mass Spectrometry, 2011
Branched polyethylenimines (PEIs) with lower average molecular weights (600, 1200 and 1800 Da) have been studied by Electrospray Ionization (ESI) and Matrix‐Assisted Laser Desorption/Ionization (MALDI) mass spectrometry. In both, ESI and MALDI mass spectra, the main distribution arises from protonated PEI oligomers with NH2 end groups, [PEI + H ...
Edgardo, Rivera-Tirado +1 more
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Branched polyethylenimines (PEIs) with lower average molecular weights (600, 1200 and 1800 Da) have been studied by Electrospray Ionization (ESI) and Matrix‐Assisted Laser Desorption/Ionization (MALDI) mass spectrometry. In both, ESI and MALDI mass spectra, the main distribution arises from protonated PEI oligomers with NH2 end groups, [PEI + H ...
Edgardo, Rivera-Tirado +1 more
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The Analyst, 2010
Electrospray-assisted laser desorption ionization (ELDI) is a technique which combines laser desorption with subsequent electrospray ionization. It is useful for directly detecting small and large molecules in solid or liquid samples under ambient conditions.
Min-Zong, Huang +4 more
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Electrospray-assisted laser desorption ionization (ELDI) is a technique which combines laser desorption with subsequent electrospray ionization. It is useful for directly detecting small and large molecules in solid or liquid samples under ambient conditions.
Min-Zong, Huang +4 more
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European Journal of Mass Spectrometry, 2012
This review reports the results of some studies carried out by us on the role of pneumatic aspects in electrospray and desorption electrospray surface ionization, with the aim of proposing some relevant aspects of the mechanisms involved in these ionization methods.
Seraglia R, Molin L, Isak I, Traldi P
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This review reports the results of some studies carried out by us on the role of pneumatic aspects in electrospray and desorption electrospray surface ionization, with the aim of proposing some relevant aspects of the mechanisms involved in these ionization methods.
Seraglia R, Molin L, Isak I, Traldi P
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Electrospray Laser Desorption Ionization
2019Electrospray laser desorption ionization (ELDI) combines the features of both electrospray ionization and laser desorption. It allows direct, sensitive, and rapid analyses of chemical compounds on the sample surfaces. Chemical and biological compounds dissolved in polar and nonpolar solvents can also be characterized directly by ELDI-mass spectrometry (
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