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• W2149707952 abstract "To elucidate quantitatively the sidearm effects on the molecular selective binding of aminated β-cyclodextrins (β-CD), microcalorimetry titration has been performed in aqueous phosphate buffer solution (pH = 7.20) at 298.15 K to give the complex stability constants (Ks) and the standard free energy (ΔG°), enthalpy (ΔH°), and entropy changes (ΔS°) for the 1:1 inclusion complexation of β-CD (1), mono(6-amino-6-deoxy)-β-CD (2), mono(6-carboxymethylamino-6-deoxy)-β-CD (3), and mono[6-(R(−)-1-hydroxymethylpropylamino)-6-deoxy]-β-CD (4) with representative bile salts, deoxycholate, cholate, glycocholate, and taurocholate. The results obtained indicate that the aminated β-CDs could alter significantly the original molecular binding ability and selectivity of parent β-CD through the cooperative electrostatic interaction, van der Waals, and hydrophobic interactions between hosts and guests. As compared with parent 1 and aminated β-CD 2, glycine-modified β-CD 3 possessing a hydrophilic carboxylic group at the sidearm shows a lower binding ability toward bile salts, attributed to the relatively weaker hydrophobic interactions and the electrostatic repulsion between host and guest to some extent. However, the R(−)-2-amino-1-butanol-modified β-CD 4 possessing additional binding sites at the chiral sidearm could significantly orient the guest molecules to be included in cavity and thus evidently enhances the molecular binding ability and selectivity through steric interactions. Thermodynamically, the higher complex stability for inclusion complexation of aminated β-CDs is mainly resulting from enthalpy gain with smaller entropy loss. The combination of calorimetric titration experiments and ROESY spectra establishes the correlation between the thermodynamic parameters and the conformation of the resulting complex, and reveals the factors governing the molecular binding ability and selectivity of bile salts by aminated β-CDs." @default.
• W2149707952 created "2016-06-24" @default.
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• W2149707952 date "2003-11-20" @default.
• W2149707952 modified "2023-09-23" @default.
• W2149707952 title "Thermodynamic Origin of Molecular Selective Binding of Bile Salts by Aminated <i>β</i>-Cyclodextrins" @default.
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• W2149707952 doi "https://doi.org/10.1021/jp036366q" @default.
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