Abstract
Solution properties (apparent specific volume, intrinsic and dynamic viscosities and surface tension) of d-glucose, d-fructose and sucrose were determined in ethanol-water binary solvent. Likewise, laser Raman spectra of water, 10% ethanol aqueous mixture and 2% (w/w) of each of the three sugars in a 10% ethanol aqueous solvent were recorded and the decomposition of the observed Raman bands in four calculated components performed. The physicochemical properties of sugars in the binary solvent show a different behaviour from that observed in water. Such behaviour seems to be related to a pronounced effect of ethanol on water structure. Ethanol acts as a water structure enhancer probably because of its hydrophobic effect. In these ethanol-water mixtures, the differentiation of d-fructose from the two other sugars is also evident. These results are helpful in the interpretation of the effect of solvent polarity on the sweet taste of small carbohydrates.
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