Analytical Estimation of Water Contents, Specific Heat Capacity and Thermal Profiles Associated with Enzymatic Model Compound β-Cyclodextrin

Abstract

Studies of water contents of solid -cyclodextrin (-CD) in crystallized and vacuum dried conditions are reported. Water contents were estimated using Karl-Fischer (KF) titration and thermo-gravimetric analysis (TGA) techniques. It was found that the water contents for crystallized and vacuum-dried samples were 6.93 and 0.86 moles of water per -CD molecule respectively. TGA studies gave values of 6.83 and 0.52 moles of water per -CD molecule respectively. The results agree with those reported from X-ray diffraction studies. Also, the molecular weight of the vacuum dried sample was determined using vapour pressure osmometry, which agrees well with the actual molecular weight of -CD. The thermal profiles of -cyclodextrin (-CD) and -CD are presented. The differential scanning calorimetry data was used to calculate specific heat at constant pressure (C p ) at different temperatures (338.15-468.15 K). These results are compared with similar data for -CD and discussed in terms of motional contribution to C p values and related conformational effects.

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