Fourier-transform mass

Freiser B S 1988 Fourier Transform Mass Speotrometry Techniques for the Study of Ion-Molecule Reactions ed J M Farrar and W FI Saunders Jr (New York Wiley)... 

Amster I J 1996 Fourier transform mass spectrometry J. Mass Spectrom. 31 1325-37... 

MALDI = matrix assisted laser desorption, ftms = Fourier transform mass spectrometry TOF = time of flight. 

Mass Spectrometry. Field desorption mass spectrometry has been used to analy2e PPO (179). Average molecular weight parameters (M and could be determined using either protonated (MH + ) or cation attachment (MNa + ) ions. Good agreement was found between fdms and data supphed by the manufacturer, usually less than 5% difference in all cases up to about 3000 amu. Laser desorption Fourier transform mass spectrometry was used to measure PPG ion and it was claimed that ions up to m/2 9700 (PEG) can be analy2ed by this method (180). 

Laser-Induced Thermal Desorption with Fourier Transform Mass Spectrometric Detection... 

The laser desorption experiments which we describe here utilize pulsed laser radiation, which is partially absorbed by the metal substrate, to generate a temperature jump in the surface region of the sample. The neutral species desorbed are ionized and detected by Fourier transform mass spectrometry (FTMS). This technique has... 

Aaserud, D. ]., Prokai, L., and Simonsick, W.J., Jr., Gel permeation chromatography coupled to Fourier transform mass spectrometry for polymer characterization, Anal. Chem., 71, 4793, 1999. 

Table 6.33 Main characteristics of Fourier-transform mass analysers...

M.V. Buchanan (ed.), Fourier Transform Mass Spectrometry Evolution, Innovation, and Applications, ACS Symposium Series No. 359, American Chemical Society, Washington, DC (1987). 

Laser desorption methods (such as LD-ITMS) are indicated as cost-saving real-time techniques for the near future. In a single laser shot, the LDI technique coupled with Fourier-transform mass spectrometry (FTMS) can provide detailed chemical information on the polymeric molecular structure, and is a tool for direct determination of additives and contaminants in polymers. This offers new analytical capabilities to solve problems in research, development, engineering, production, technical support, competitor product analysis, and defect analysis. Laser desorption techniques are limited to surface analysis and do not allow quantitation, but exhibit superior analyte selectivity. 

FAB Fast atom bombardment FTMS Fourier-transform mass spectrometry... 

Stump, M. J. Jones, J. J. Fleming, R. C. Lay, J. O., Jr. Wilkins, C. L. Use of double-depleted 13C and 15N culture media for analysis of whole cell bacteria by MALDI time-of-flight and Fourier transform mass spectrometry. J. Am. Soc. Mass Spectrom. 2003,14,1306-1314. 

Brown, R. S. Wilkins, C. L. Laser desorption Fourier transform mass spectrometry of synthetic porphyrins. Anal. Chem. 1986,58,3196-3199. 

Fourier transform mass spectrometry is made possible by the measurement of an AC current produced from the movement of ions within a magnetic field under ultra-high vacuum, commonly referred to as ion cyclotron motion.21 Ion motion, or the frequency of each ion, is recorded to the precision of one thousandth of a Hertz and may last for several seconds, depending on the vacuum conditions. Waveform motion recorded by the mass analyzer is subjected to a Fourier transform to extract ion frequencies that yield the corresponding mass to charge ratios. To a first approximation, motion of a single ion in a magnetic field can be defined by the equation... 

Li, Y. Tang, K. Little, D. P. Koster, H. Hunter, R. L. Mclver, R. T. High-resolution MALDI Fourier transform mass spectrometry of oligonucleotides. Anal. Chem. 1996, 68, 2090-2096. 

Ledford, E. B., Jr. Rempel, D. L. Gross, M. L. Space charge effects in Fourier transform mass spectrometry Mass calibration. Anal. Chem. 1984,56, 2744-2748. 

Fourier Transform Mass Spectrometry Fourier Transform Nuclear Magnetic Resonance Spectrometry... 

Figure 2.12 Time domain free ion decay signal (a). Fourier transformed mass spectrum (b)...

O.F. van den Brink, J.J. Boon, P.B. O Connor, M.C. Duursma, and R.M.A. Heeren, Matrix assisted laser desorption/ionization Fourier transform mass spectrometric analysis of oxyge nated triglycerides and phosphatidylcholines in egg tempera paint dosimeters used for environ mental monitoring of museum display conditions, J. Mass Spectrom., 36, 479 492 (2001). 

Lee, S., Young, N.L., Whetstone, P.A., Cheal, S.M., Benner, W.H., Lebrilla, C.B., and Meares, C.F. (2006) A method to site-specifically identify and quantitate carbonyl end products of protein oxidation using oxidation-dependent element coded affinity tags (O-ECAT) and nanoLiquid chromatography Fourier transform mass spectrometry./. Proteome Res. 5(3), 539-547. 

The initial observation is that PMMA is essentially completely degraded to monomer by heating to 375°C in a sealed tube while heating a mixture of red phosphorus and PMMA under identical conditions yields a solid, non-deqraded, product as well as a lower yield of monomer. One may observe, by 3C NMR spectroscopy, that the methoxy resonance is greatly decreased in intensity and methyl, methoxy phosphonium ions are observed by 31P NMR. Additional carbonyl resonances are also seen in the carbon spectrum, this correlates with a new carbonyl vibration near 1800 cm 1 in the infrared spectrum and may be assigned to the formation of anhydride. The formation of anhydride was also confirmed by assignment of mass spectra obtained by laser desorption Fourier transform mass spectroscopy, LD-FT-MS. 

B. A. Budnik, K. B. Jensen, T. J. Jorgensen, A. Haase, and R. A. Zubarev. Benefits of 2.94 Micron Infrared Matrix-Assisted Laser Desorption/Ionization for Analysis of Labile Molecules by Fourier Transform Mass Spectrometry. Rapid Commun. Mass Spectrom., 14(2000) 578-584. 

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