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Title of Journal: J Incl Phenom Macrocycl Chem

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Abbravation: Journal of Inclusion Phenomena and Macrocyclic Chemistry

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Springer Netherlands

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DOI

10.1007/bf02338837

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ISSN

1573-1111

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Determination of the ionization constants of natur

Authors: R Maeztu G Tardajos G GonzálezGaitano
Publish Date: 2010/03/02
Volume: 69, Issue: 3-4, Pages: 361-367
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Abstract

The purpose of this investigation has been to establish reference pK a values in D2O for the three natural CDs by highresolution 1HNMR according to the recent guidelines provided by the IUPAC for the determination of extreme pK a values The most alkaline conditions achieved in this study than in previous pH potentiometric assays have made possible to deduce the pK a for the three acidic groups of each CD In addition we have studied the effects of the ionization of βCD on the aggregation properties of this macrocycle in H2O by dynamic light scattering DLS as a function of pH This procedure provides an indirect way of measuring the pK a of βCD either by tracking the percentage of scattered light or the hydrodynamic radii of the species involved and reveals that the aggregates of βCD break and reduce their size progressively upon ionization of the OH− groups in positions 2 and 3

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