Journal of the Mass Spectrometry Society of Japan
Online ISSN : 1880-4225
Print ISSN : 1340-8097
ISSN-L : 1340-8097
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Volume 57, Issue 1
Displaying 1-8 of 8 articles from this issue
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REGULAR PAPER
  • Inclusion of Alkali Metal Ions by Permethylated Inulin Studied by Electrospray Ionization Mass and Multinuclear Nuclear Magnetic Resonance Spectrometric Approaches
    Yoshio TAKAI, Hitoshi YAMADA, Gakuto GOSHIMA, Yukimasa IWAHORI, Juichi ...
    2009 Volume 57 Issue 1 Pages 1-8
    Published: February 01, 2009
    Released on J-STAGE: February 16, 2009
    DOIhttps://doi.org/10.5702/massspec.57.1
    JOURNAL FREE ACCESS
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    Inclusions of alkali metal ions by permethylated inulin (MeInu) were examined by electrospray ionization (ESI) mass spectrometry and multinuclear nuclear magnetic resonance (NMR) spectroscopy. Complexes of MeInu with metal ions were observed as multicharged ions in ESI mass spectra. The number of fructofuranose units of MeInu binding to one metal ion was 12, 6, and 7 for Li+, K+, and Cs+, respectively, on the basis of ESI mass spectra. However, the number estimated on the basis of multinuclear NMR spectra was 2 and 3-4 for Li+ and K+, respectively. The binding ability of MeInu to Li+ is very weak, so metal ions dissociate from the complex in the ionization process. As a result, the ratio of fructofuranose units to Li+ ions might have been estimated in excess. In the case of K+ and Cs+, the number of fructofuranose units binding a metal ion is found to be in good agreement with that of the oxyethylene units of crown ethers in solution.
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INTEGRATED PAPER
  • Analysis of Insoluble Organic Pigments by Desorption/Ionization Mass Spectrometry
    Daiki ASAKAWA, Ichiro KUDAKA, Kenzo HIRAOKA
    2009 Volume 57 Issue 1 Pages 15-22
    Published: February 01, 2009
    Released on J-STAGE: February 16, 2009
    DOIhttps://doi.org/10.5702/massspec.57.15
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    We performed a comparison of electrospray droplet impact (EDI) with laser desorption ionization (LDI) and matrix-assisted laser desorption/ionization (MALDI) to analyze several organic pigments, including Pigment Yellow 93, Pigment Yellow 180, and Pigment Green 36, as test samples. These samples are poorly soluble in standard solvents. In EDI, samples were prepared by direct deposition of the powder samples on the substrates. No matrices were used. We also found that EDI was an easy, versatile method for testing as-received samples. However, some fragment ions were generated in the EDI process. In contrast, in negative-mode MALDI mass spectrometry using tetrathiafulvalene (TTF) as a matrix, we found that fragment ions were much less abundant than in positive-mode MALDI, EDI, or LDI. Using TTF as a matrix, the most abundant analyte ions produced were radicals or deprotonated anions.
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COMMENTARIES
  • Development of Quadrupole Mass Spectrometers and Ion Optical Devices
    Kozo MISEKI
    2009 Volume 57 Issue 1 Pages 23-29
    Published: February 01, 2009
    Released on J-STAGE: February 16, 2009
    DOIhttps://doi.org/10.5702/massspec.57.23
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    The success of on-line combinations of mass spectrometers with chromatography has helped to spread mass spectrometers. Currently, several types of mass spectrometers are commercially available. Among these, quadrupole mass spectrometers are most commonly used. The basic principle of quadrupole mass spectrometers is easily described mathematically. However, there are several technical problems which must be overcome to realize a truly practical instrument, better enabling mass production. Here, we introduce two technologies that we have developed at Shimadzu. One is the electrode configuration to reduce mass discrimination caused by the exit fringing field. The other is a method of peak shape improvement using unstable bands which are generated by modulating quadrupole fields. The principle of unstable band generation inside a stable band is briefly described. Experience and understanding acquired through the development of quadrupole mass spectrometers are the technical basis for the subsequent development of radio frequency drive ion optical devices. We also briefly introduce the ion optical devices which we have developed and applied to commercial instruments.
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  • Principles of the Delayed Extraction Technique
    Koichi TANAKA, Takaya SATOH, Ken-ichi YOSHINO
    2009 Volume 57 Issue 1 Pages 31-36
    Published: February 01, 2009
    Released on J-STAGE: February 16, 2009
    DOIhttps://doi.org/10.5702/massspec.57.31
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    The delayed extraction (also known as pulsed extraction) technique involves the application of a time delay between the ionization pulse and an accelerating voltage pulse for desorption/ionization from a surface. This technique can achieve energy focusing in a matrix-assisted laser desorption/ionization (MALDI) time-of-flight (TOF) mass spectrometer and is used to improve mass resolving power. We explain the principles of delayed extraction (pulsed extraction) used in a MALDI TOF mass spectrometer.
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  • The Deprecated Term “Daughter Ion”
    Ken-ichi YOSHINO
    2009 Volume 57 Issue 1 Pages 37-39
    Published: February 01, 2009
    Released on J-STAGE: February 16, 2009
    DOIhttps://doi.org/10.5702/massspec.57.37
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  • The Deprecated Term “Parent Ion”
    Ken-ichi YOSHINO
    2009 Volume 57 Issue 1 Pages 40-41
    Published: February 01, 2009
    Released on J-STAGE: February 16, 2009
    DOIhttps://doi.org/10.5702/massspec.57.40
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Letter to the Editor
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