Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
Original Papers
Thermal Behavior and Structure of Low-temperature Water Confined in Sephadex G15 Gel by Differential Scanning Calorimetry and X-ray Diffraction Method
Kanae ITOKoji YOSHIDAKikujiro UJIMOTOToshio YAMAGUCHI
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Supplementary material

2013 Volume 29 Issue 3 Pages 353-359

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Abstract
The thermal behavior and structure of water confined in Sephadex G15 gel were investigated over a temperature range of 298 – 173 K at hydration levels, h (= mass of water/mass of dry G15 gel), of 0.24 – 1.38 by differential scanning calorimetry (DSC) and an X-ray diffraction (XRD) method, respectively. The ice-melting peaks on the DSC curves were deconvoluted to estimate the amounts of three states of water in G15 with h: free water, freezable bound water, and unfrozen water. The X-ray radial distribution functions of unfrozen water at h = 0.24 revealed that the hydrogen-bonded structure of water is largely distorted, due to hydrogen bonding with the surface hydroxyl groups of gel substrates, compared with those of freezable bound water at h = 0.47 and bulk water. A plausible separation mechanism of solutes in gel chromatography was considered from a structural point of view of confined water.
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© 2013 by The Japan Society for Analytical Chemistry
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