Journal
ANALYTICAL SCIENCES
Volume 29, Issue 3, Pages 353-359Publisher
JAPAN SOC ANALYTICAL CHEMISTRY
DOI: 10.2116/analsci.29.353
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Funding
- JSPS KAKENHI [23550028]
- MEXT
- Grants-in-Aid for Scientific Research [23550028, 22550024] Funding Source: KAKEN
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The thermal behavior and structure of water confined in Sephadex 015 gel were investigated over a temperature range of 298 - 173 K at hydration levels, h (= mass of water/mass of dry 015 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 015 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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