Abstract
Deuterium relaxation times ofd- andl-α-d-tryptophan included in β-cyclodextrin derivatives were directly measured by deuterium NMR spectroscopy. The results showed that the molecular motion of the tryptophan molecule was strongly restricted even in the cavity of unmodified β-cyclodextrin and the additional recognition groupings — ammonium and carboxylate — on β-cyclodextrin did not affect the molecular motion of tryptophan, though the association constants were significantly enhanced.
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