External Ionization Source Improvements for Fourier Transform Ion Cyclotron Resonance Mass Spectrometry PDF Download
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Author: Keith David Zientek
Publisher:
ISBN:
Category :
Languages : en
Pages : 204
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Author: Keith David Zientek
Publisher:
ISBN:
Category :
Languages : en
Pages : 204
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Author: Ragulan Ramanathan
Publisher:
ISBN: 9780530004860
Category : Science
Languages : en
Pages : 290
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Abstract: Design, development, and coupling of an electrospray ionization (ESI) source with a Fourier Transform Ion Cyclotron (FTICR) Mass Spectrometer (MS). Developed ESI source was used for detection and characterization of small and large molecules. Dissertation Discovery Company and University of Florida are dedicated to making scholarly works more discoverable and accessible throughout the world. This dissertation, "Internal and External Source Electrospray Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry" by Ragulan Ramanathan, was obtained from University of Florida and is being sold with permission from the author. A digital copy of this work may also be found in the university's institutional repository, IR@UF. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
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To improve the existing ion transport optics of our glow discharge-Fourier transform ion cyclotron resonance (GD-FTICR) mass spectrometer, we have simulated several ion trajectories between the glow discharge source region and the ICR analyzer cell. These calculations suggested that a number of simple improvements, including the use of an ion flight tube and an electrically isolated conductance limit, would increase the efficiency of ion transfer through the fringing fields of the FTICR superconducting magnet and into the ICR analyzer cell. Ion beam intensity was monitored before and after implementing these improvements as a function of the distance between the glow discharge source and the analyzer cell. A twenty-fold improvement in the transport efficiency, as well as a significant enhancement in detected FTICR signals, was observed.
Author: James Edward Bruce
Publisher:
ISBN:
Category :
Languages : en
Pages : 6
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Author: Konstantin Aizikov
Publisher:
ISBN:
Category :
Languages : en
Pages : 240
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Abstract: Mass spectrometry imaging (MSI) is an emerging experimental methodology whose primary objective is the investigation of spatial variation of molecular composition within and across selected biological tissues to enable biomarker discovery, molecular diagnosis, and studies of drug metabolism, among other applications. The two major challenges, therefore, are the unambiguous identification and precise localization of biologically relevant compounds. These challenges can be recast as a problem of improving the accuracy and resolution of mass analyzers as well as the accuracy of the sample positioning robotics. The first part of this work reports on the progress and outlines the strategies of application of a recently developed high resolution spectral analysis technique, called the Filter Diagonalization Method (FDM), for the investigation of space-charge related phenomena inside the detection cell of a Fourier Transform Ion Cyclotron Resonance Mass Spectrometer (FT-ICR MS), understanding of which lies at the heart of the quest for further improvements in mass accuracy and resolution. The FDM spectrographic analysis revealed previously unobserved rapid isotope- beat space-charge induced ICR frequency modulations, shown to reach up to +/- 400 ppm even on high quality spectra. The application of this methodology to the investigation of a frequently observed but previously unexplained phenomenon in FT-ICR MS, the Spontaneous Loss of Coherence Catastrophe, conclusively demonstrated that it is tied directly to the space charge effect and magnetron expansion. The second part of this work reports on the development of the ionization source and vacuum compatible high precision sample positioning robotics for biological MSI applications, purpose built for FT-ICR MS. The complete design and implementation is reported herein, along with the demonstration of its performance and biological application. The XY-positioning stage capable of operating under 10 -8 mbar vacuum with submicron positioning accuracy along the entire ranges of motion of 100x100 mm was designed, built, and installed into the ionization sources of three MALDI FT-ICR MS instruments. Two dimensional chemo-spatial maps of rat brain tissue selections were constructed with 150 micron spatial resolution, identifying multiple ionic species with their distinct and discreet spatial localizations. These demonstrated performance characteristics greatly surpass current state-of-the-art robotics available for MALDI MSI and shift the effort of further improvements in spatial resolution to the ionization methodologies, and other ion source design issues, such as laser optics.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 42
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An external source electrospray ionization (ESI) Fourier transform ion cyclotron resonance (FTICR) mass spectrometer has been used to study the organometallic complexes Ag2(DPM)2(BF4)2 (where DPM = bis-diphenylphosphino- methane), Ag2(DPM)3(BF4)2 and Ru(II)(bp)3(PF6)2 (where bpy = 2,2'-bipyridyl). The high mass resolution and accurate mass assignment of parent and collisionally induced dissociation (CID) fragment ions provided structural information on these organometallic complexes. CID in the capillary/skimmer region and inside the FTICR analyzer cell were performed on these complexes and results from each type of experiment were compared. Important fragmentation pathways and reaction types, including bond cleavage, ligand loss, and ligand substitution were identified. Electrospray ionization, Organometallic complexes, Fourier transform ion cyclotron resonance mass spectrometry.
Author: Patrick Alan Limbach
Publisher:
ISBN:
Category :
Languages : en
Pages : 494
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Author: Raymond E. March
Publisher: CRC Press
ISBN: 1420083724
Category : Science
Languages : en
Pages : 952
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Reflecting the substantial increase in popularity of quadrupole ion traps and Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometers, Practical Aspects of Trapped Ion Mass Spectrometry, Volume IV: Theory and Instrumentation explores the historical origins of the latest advances in this expanding field. It covers new methods for trapp
Author: Peter Byron Grosshans
Publisher:
ISBN:
Category :
Languages : en
Pages : 416
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Author: Xinzhen Jane Xiang
Publisher:
ISBN:
Category :
Languages : en
Pages : 554
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