Role of Solutes in the Hydrogen Bonding of Water-Ethanol Mixtures

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  • 水‐エタノール混合溶媒中の水素結合性に及ぼす溶存成分の役割
  • 水-エタノール混合溶媒中の水素結合性に及ぼす溶存成分の役割
  • ミズ エタノール コンゴウ ヨウバイチュウ ノ スイソ ケツゴウセイ ニ オヨボス ヨウゾン セイブン ノ ヤクワリ

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Abstract

The properties of the hydrogen bonding of water-ethanol in alcoholic beverages have not been sufficiently clarified. We investigated possible factors that could affect the hydrogen-bonding structure of water-ethanol on the basis of proton nuclear magnetic resonance (1H NMR) chemical shifts of the OH of water-ethanol and Raman OH stretching spectra. Not only acids (H+ and HA : un-dissociated acids) but also bases (OH− and A− : conjugate-base anions from the weak acids) caused a development in the hydrogen-bonding structure of water-ethanol media. We also demonstrated that the hydrogen bonding was strengthened by chemical components in alcoholic beverages (whiskey, Japanese sake, and shochu). This suggested that hydrogen-bonding donors as well as acceptors in alcohol beverages, which exist as initial components or are gained later on, should cause a promoted proton-exchange between water and ethanol molecules.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 57 (3), 171-181, 2008

    The Japan Society for Analytical Chemistry

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