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 56, Issue 2
Displaying 1-9 of 9 articles from this issue
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REGULAR PAPER
TECHNICAL REPORT
  • Analysis of an Aromatic Petroleum Resin and a Coumarone Resin by Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry
    Yoshio KUMOOKA
    2008 Volume 56 Issue 2 Pages 41-48
    Published: April 01, 2008
    Released on J-STAGE: April 15, 2008
    DOIhttps://doi.org/10.5702/massspec.56.41
    JOURNAL FREE ACCESS
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    Commercial aromatic petroleum resins and coumarone resins, the representative tackifiers that constitute pressure-sensitive adhesives (PSAs), were analyzed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS). The optimum analytical method uses dithranol as a matrix with silver trifluoroacetate as a cationizing agent. The aromatic petroleum resins are prepared from C8-C10 fraction produced by petroleum cracking, and the coumarone resins are prepared from indene-coumarone fraction of coal tar. The representative monomer of the C8-C10 fraction is vinyltoluene and those of the indene-coumarone fraction is coumarone. The other major reactive monomers are common in both the fractions, which have similar molecular weights. These resins, however, showed characteristic mass spectra and were discriminated clearly based on their mass spectra. The ion distributions of their pentamers calculated under given monomer compositions also are nearly identical with those of the observed mass spectra. Acetone extracts of PSAs were analyzed by MALDI-TOF-MS, and an aromatic petroleum resin and a coumarone resin were identified successfully.
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COMMENTARIES
Letters to the Editor
Letter from the Editor-in-Chief
  • Comments on Usage of the Alias “Mirimasu”
    Ken-ichi YOSHINO
    2008 Volume 56 Issue 2 Pages 69-76
    Published: April 01, 2008
    Released on J-STAGE: April 15, 2008
    DOIhttps://doi.org/10.5702/massspec.56.69
    JOURNAL FREE ACCESS
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    The Japanese word “mirimasu” originates from the English words “milli” and “mass.” It is normally used as an alias for “measured accurate mass” and “accurate mass measurement.” It causes confusions that “mirimasu” is also used as an alias for “high resolution mass spectrometry,” “high resolution mass spectrum (spectra),” and “mass spectrometer with high mass resolving power.” This nomenclature results from the fact that “high resolution” is confused with “high accuracy.” In addition to these interpretations, Japanese mass spectrometrists also use “mirimasu” as an alias for “one-thousandth of a unified atomic mass unit,” “one-thousandth of a dalton (mDa),” and “one-thousandth of an m/z unit.” This incorrect usage is due to a lack of understanding of the unit system of atomic mass and m/z on mass spectra. Therefore, “mirimasu” should not be used in Japanese, because it is ambiguous and involves various problems and misunderstandings.
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