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  • Title: 7-Deaza purine bases offer a higher ion stability in the analysis of DNA by matrix-assisted laser desorption/ionization mass spectrometry.
    Author: Kirpekar F, Nordhoff E, Kristiansen K, Roepstorff P, Hahner S, Hillenkamp F.
    Journal: Rapid Commun Mass Spectrom; 1995; 9(6):525-31. PubMed ID: 7606047.
    Abstract:
    Oligodeoxynucleotides which contain 7-deaza analogues of the normal purine nucleotides have been synthesized both enzymatically and chemically. When subjected to matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) analysis, the modified samples offer both higher stability and increased sensitivity compared to otherwise identical unmodified oligodeoxynucleotides. In view of these observations, models for the fragmentation of oligodeoxynucleotides in MALDI-MS with positive ion detection mode are presented. Additionally, the potential use of 7-deaza purine nucleotides in the MALDI-MS analysis of DNA sequencing reactions is discussed.
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