The effect of counter ions in matrix-assisted laser desorption/ionization of poly(methyl methacrylate)

Anne Mette Hoberg, David M. Haddleton, Peter J. Derrick, Anthony T. Jackson, James Scrivens

    Research output: Contribution to journalArticlepeer-review

    37 Citations (Scopus)

    Abstract

    The role of the counter anion in positive-ion matrix-assisted laser desorption/ionization (MALDI) mass spectrometry of poly(methyl methacrylate) (PMMA) has been investigated. When PMMA was analyzed by MALDI in the presence of different alkali metal halides, A+X-, ion yields decreased on changing X- from I- to Br- to Cl-. The effects of changing the alkali metal cation A+ were greater when X- was chloride than when X- was iodide. With a mixture of two different alkali metal cations, PMMA showed different affinities for the cations, dependent upon which counter anion was present.

    Original languageEnglish
    Pages (from-to)435-440
    Number of pages6
    JournalEuropean Journal of Mass Spectrometry
    Volume4
    Issue number6
    Publication statusPublished - 1 Dec 1998

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