Comments on the Usage of the Terms "Accurate Mass"and "Exact Mass"

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  • YOSHINO Ken-ichi
    Biosignal Research Center, Organization of Advanced Science and Technology, Kobe University Editor-in-chief

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  • 目から鱗のマススペクトロメトリー第１３回「精密質量」～Ａｃｃｕｒａｔｅ　Ｍａｓｓ　ですか？　Ｅｘａｃｔ　Ｍａｓｓ　ですか？～
  • Letter from the Editor-in-Chief 目から鱗のマススペクトロメトリー(第13回)精密質量--Accurate Massですか? Exact Massですか?
  • Letter from the Editor in Chief メ カラ ウロコ ノ マス スペクトロメトリー ダイ 13カイ セイミツ シツリョウ Accurate Mass デスカ Exact Mass デスカ

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The terms “accurate mass” and “exact mass” are not synonymous in mass spectrometry. Accurate mass refers to the mass value of an ion or radical determined experimentally by mass spectrometry. On the other hand, exact mass refers to the mass value of a single ion, radical, or molecule calculated by summing the mass values of individual isotopes. To avoid confusion, “measured accurate mass” and “calculated exact mass” should be used in place of “accurate mass” and “exact mass,” respectively.

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