Abstract
Although phase-solubility studies have often been used to evaluate the interaction of cyclodextrins (CDs) with various drugs, hundreds of milligrams of both CD and drug are required to prepare a phase diagram. A method that would require considerably less material for evaluating complex formation between a CD and guest compound is therefore needed. We previously reported the detection of the interactions between β-CD and various drugs using a Biacore® system. In this study, we succeeded in immobilizing 6-monodeoxy-6-monoamino-γ-CD on the gold surface of a sensor chip and in detecting the interactions between the immobilized γ-CD and various drugs. The interaction processes were kinetically analyzed using Biacore®. The surface plasmon resonance sensorgrams indicated that the association and dissociation rates of the interactions between γ-CD and drugs were faster than those between β-CD and drugs. Although the association constants calculated from the sensorgrams were smaller than those calculated from phase-solubility studies, good correlation was shown between these data.
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