Abstract
This paper describes the combination of matrix-assisted laser desorption/ionization time-of-flight mass spectrometry with label free bio-interaction analysis based on reflectometric interference spectroscopy (RIfS). The potential of this concerted approach is demonstrated by measuring the binding properties of different vancomycin-type glycopeptide antibiotic mixtures. Although RIfS is sensitive and does not require use of a label, it cannot determine which components of a mixture have bound to the surface after incubation. Fortunately, each bound species has a unique mass that can, afterwards, be determined by mass spectrometry. Thus, the screening capability of RIfS is combined with the identification capability of mass spectrometry.
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Acknowledgments
Martin Mehlmann was supported by the DFG-Graduate colleague “Quantitative Analysis and Characterisation of Pharmaceutically and Biochemically relevant Substances” at the University of Tübingen and by the Fonds der Chemischen Industrie. Desvancosamin-vancomycin was a kind gift from Dr Evi Stegmann, AG Wohlleben, University of Tübingen.
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Dedicated to the memory of Wilhelm Fresenius
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Mehlmann, M., Garvin, A.M., Steinwand, M. et al. Reflectometric interference spectroscopy combined with MALDI−TOF mass spectrometry to determine quantitative and qualitative binding of mixtures of vancomycin derivatives. Anal Bioanal Chem 382, 1942–1948 (2005). https://doi.org/10.1007/s00216-005-3329-7
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DOI: https://doi.org/10.1007/s00216-005-3329-7