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  • Title: MALDI-TOF-MS analysis of sialylated glycans and glycopeptides using 4-chloro-α-cyanocinnamic acid matrix.
    Author: Selman MH, Hoffmann M, Zauner G, McDonnell LA, Balog CI, Rapp E, Deelder AM, Wuhrer M.
    Journal: Proteomics; 2012 May; 12(9):1337-48. PubMed ID: 22589184.
    Abstract:
    For MALDI analysis of glycans and glycopeptides, the choice of matrix is crucial in minimizing desialylation by mass spectrometric in-source and metastable decay. Here, we evaluated the potential of 4-chloro-α-cyanocinnamic acid (Cl-CCA) for MALDI-TOF-MS analysis of labile sialylated tryptic N-glycopeptides and released N- and O-glycans. Similar to DHB, but in contrast to CHCA, the Cl-CCA matrix allowed the analysis of sialylated N-glycans and glycopeptides in negative ion mode MALDI-TOF-MS. Dried droplet preparations of Cl-CCA provided microcrystals with a homogeneous spatial distribution and high shot-to-shot repeatability similar to CHCA, which simplified the automatic measurement and improved the resolution and mass accuracy. Interestingly, reflectron-positive ion mode analysis of 1-phenyl-3-methyl-5-pyrazolone (PMP)-labeled O-glycans with Cl-CCA revealed more complete profiles than with DHB and CHCA. In conclusion, we clearly demonstrate the high potential of this rationally designed matrix for glycomics and glycoproteomics.
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