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Wide mass range trapping using a 7-T internal source matrix-assisted laser desorption/ionization Fourier transform mass spectrometer

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Abstract

A wide mass range trapping experiment using internal source matrix-assisted laser desorption–Fourier transform mass spectrometry (MALDI–FTMS) was evaluated. In this method, the front trap plate potential is ramped up and the rear trap plate potential is simultaneously decreased using a cubic cell to trap ions over a wide range of mass-to-charge ratios. To apply this to MS/MS experiments, a second ion ejection procedure would remove unwanted ions, with the selected remaining ions then fragmented by collision-induced dissociation. In measurements using a 7.2-T unshielded magnet presented here, an approximately equimolar mixture of a set of poly(ethylene glycol) (PEG) species for the ramped measurements had peak areas of 1.0:1.0:1.0:1.0, as did the previously described integral method which gave peak areas of 1.0:1.1:1.0:1.0, in good agreement with the known composition of the samples deposited on the MALDI probe tip. Comparative MALDI–TOF in reflectron mode results were of similar quality for the equimolar mixture, giving a ratio of 1.0:1.0:1.2:0.9. All methods failed to varying degrees when individual PEG compositions of the trial mixture were changed. However, the previously described integral method showed relatively better results for all but the PEG 8000 doubled mixture.

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Acknowledgments

We gratefully acknowledge support through National Science Foundation Grant CHE-0455134. We would like to thank Dr. Sabine Borgmann, Dr. Jeffrey J. Jones, and Dr. Rohana Lyianage for valuable discussions.

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Authors and Affiliations

  1. Chemistry and Biochemistry Department, University of Arkansas, Fayetteville, AR, 72701, USA

    Sasa M. Miladinovic, Scott A. Robotham & Charles L. Wilkins

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  1. Sasa M. Miladinovic
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  2. Scott A. Robotham
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  3. Charles L. Wilkins
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Correspondence to Charles L. Wilkins.

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Miladinovic, S.M., Robotham, S.A. & Wilkins, C.L. Wide mass range trapping using a 7-T internal source matrix-assisted laser desorption/ionization Fourier transform mass spectrometer. Anal Bioanal Chem 392, 585–594 (2008). https://doi.org/10.1007/s00216-008-2251-1

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  • DOI: https://doi.org/10.1007/s00216-008-2251-1

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