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Title: Studies of osmotic coefficients and volumetric behaviour on aqueous solutions of β-cyclodextrin at 298.15 K
Authors: Dagade, Dilip H
Kolhapurkar, Rahul R
Patil, Kesharsingh J
Issue Date: Oct-2004
Publisher: NISCAIR-CSIR, India
IPC Code: Int. Cl.7 G01N 13/04
Abstract: The osmotic coefficient, solute activity coefficients and apparent molar volume are determined for β-cyclodextrin (β -CD ) using the techniques of vapor pressure osmometry and digital densitometer in aqueous solutions (0.00164 to 0.01308 mol kg-1) at 298.15 K. The thermodynamic data of activities and partial molar volumes for solvent and solute are computed using appropriate methodology and equations. Theories of dilute solutions such as McMillan-Mayer and Flory-Huggins are applied to estimate the second virial coefficient (B*2) for β-CD, the number of binding sites and χ12 interaction parameter. Using the partial molar volume data at infinite dilution and B*2 value, the contribution due to solute-solvent and solute-solute interactions in terms of attractive and repulsive components are estimated. The values of B*2 and the components are compared with the values reported for mono-saccharides, disaccharides and other non-electrolytes. The results are discussed in terms of hydrophobic hydration and hydrophobic interaction.
Page(s): 2073-2080
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.43A(10) [October 2004]

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