The Interaction of 1-Naphthalenesulfonate with [beta]-Cyclodextrin. Studies by Calorimetry and Proton Nuclear Magnetic Resonance Spectroscopy

The Interaction of 1-Naphthalenesulfonate with [beta]-Cyclodextrin. Studies by Calorimetry and Proton Nuclear Magnetic Resonance Spectroscopy

The interaction of 1-naphthalenesulfonate (1-NS) with β-cyclodextrin was investigated in a 0.1M phosphate buffer at pH7.4 by an LKB 2277 microcalorimeter, using a flow-mixed mode at 25°C. The thermodynamic parameters for inclusion complex formation obtained are as follows : δG°=-13.2kJ/mol (K=209M-1...

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Veröffentlicht in:Chemical & pharmaceutical bulletin 1997-05, Vol.45 (5), p.899
Hauptverfasser: NISHIJO, Juziro, USHIRODA, Yuko, OHBORI, Hiroe, SUGIURA, Makiko, FUJII, Noriko
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container_issue 5
container_start_page 899
container_title Chemical & pharmaceutical bulletin
container_volume 45
creator NISHIJO, Juziro
USHIRODA, Yuko
OHBORI, Hiroe
SUGIURA, Makiko
FUJII, Noriko
description The interaction of 1-naphthalenesulfonate (1-NS) with β-cyclodextrin was investigated in a 0.1M phosphate buffer at pH7.4 by an LKB 2277 microcalorimeter, using a flow-mixed mode at 25°C. The thermodynamic parameters for inclusion complex formation obtained are as follows : δG°=-13.2kJ/mol (K=209M-1), δH°=-1.87kJ/mol, δS°=38.1J/mol K. The main driving force for inclusion complex formation was considered to be the hydrophobic interaction, whereas the contribution of the van der Waals-London dispersion force was minor. Also, from measurements of the proton nuclear magnetic resonance spectra and the model building with Corey-Pauling-Koltum atomic models, the probable structures of the inclusion complex were determined.
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The main driving force for inclusion complex formation was considered to be the hydrophobic interaction, whereas the contribution of the van der Waals-London dispersion force was minor. 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title The Interaction of 1-Naphthalenesulfonate with [beta]-Cyclodextrin. Studies by Calorimetry and Proton Nuclear Magnetic Resonance Spectroscopy
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