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Interaction of water-soluble calix[4]arene with l-tryptophan studied by fluorescence spectroscopy

Paper ID Volume ID Publish Year Pages File Format Full-Text
28036 44056 2008 5 PDF Available
Title
Interaction of water-soluble calix[4]arene with l-tryptophan studied by fluorescence spectroscopy
Abstract

The complexing ability of water-soluble calix[4]arene for l-tryptophan (l-try) was investigated by a variety of techniques. The spectrofluorometry titrations were performed at different temperatures to determine stability constants, as well as to evaluate the thermodynamic parameters of the obtained complex. The effect of pH on the complexation process was quantitatively assessed. Moreover, to obtain information about the binding mechanism of the interaction, 1H NMR studies were carried out. Molecular modeling showed that water-soluble calix[4]arene accommodated part of l-amino acid in its cavity meanwhile the aliphatic chain of l-tryptophan stuck out of the cavity. Based on the experiment data, the association process of complexes was established. The water-soluble calix[4]arene was found to be able to adjust its conformation to fit the size of aromatic l-tryptophan, and the benzene ring of amino acid penetrated into the hydrophobic cavity of calix[4]arene.

Keywords
Spectrofluorometry; Aromatic l-amino acid; Water-soluble calix[4]arene
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 197, Issues 2–3, 25 June 2008, Pages 389–393
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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