期刊
JOURNAL OF BIOSCIENCE AND BIOENGINEERING
卷 102, 期 4, 页码 269-280出版社
SOC BIOSCIENCE BIOENGINEERING JAPAN
DOI: 10.1263/jbb.102.269
关键词
chemical shift in proton nuclear magnetic resonance; hydrogen bonding; Raman spectrum; water structure; water-ethanol; whiskey; Japanese sake; shochu
An alcoholic beverage is a type of water-ethanol solution with flavor and taste. The properties of the hydrogen bonding of water-ethanol in alcoholic beverages have not been clarified sufficiently. We investigated factors that could affect the hydrogen-bonding structure of water-ethanol on the basis of proton nuclear magnetic resonance (H-1 NMR) chemical shifts of the OH of water-ethanol and Raman OH stretching spectra. Not only acids (H+ and HA: undissociated acids) but also bases (OH- and A(-): conjugate-base anions from weak acids) strengthened the hydrogen-bonding structure of water-ethanol. It Was also demonstrated that the hydrogen bonding is strengthened by chemical components in alcoholic beverages (whiskey, Japanese sake, shochu). It can be suggested that hydrogen-bonding donors as well as acceptors in alcohol beverages, which exist as the initial components or are gained. later on, should cause the tight association between water and ethanol molecules.
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