Abstract
The theory and practice of proton microspeciation based on NMR–pH titrations are surveyed. Principles of bi-, tri-, tetra-, and n-protic microequilibrium systems are discussed. Evaluation methods are exemplified by case studies on bi- and tetraprotic biomolecules. Selection criteria and properties of ‘reporter’ NMR nuclei are described. Literature data on complete microspeciations of small ligands and site-specific basicity characterizations of peptides and proteins are critically reviewed.
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Acknowledgements
This work was supported by the grant OTKA T43579. Z. Sz. is indebted to Prof Gerhard Hägele (Heinrich Heine University Düsseldorf) for invaluable mentoring during the DAAD scholarship years.
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Szakács, Z., Kraszni, M. & Noszál, B. Determination of microscopic acid–base parameters from NMR–pH titrations. Anal Bioanal Chem 378, 1428–1448 (2004). https://doi.org/10.1007/s00216-003-2390-3
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DOI: https://doi.org/10.1007/s00216-003-2390-3