Researchers at Linnaeus University in Sweden have found that adding water to whisky alters the drink's molecules to make it taste better.
Whisky is a chemically complicated beverage. After malting, mashing, fermentation, distillation and maturing, for at least three years in oak barrels, it is bottled.
However, first whisky is usually diluted to around 40 per cent of alcohol by volume by the addition of water, which changes the taste significantly.
"The taste of whisky is primarily linked to so-called amphipathic molecules, which are made up of hydrophobic and hydrophilic parts," said Bjorn Karlsson, chemistry researcher at Linnaeus University.
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"One such molecule is guaiacol, a substance that develops when the grain is dried over peat smoke when making malt whisky, providing the smoky flavour to the whisky," Karlsson said.
Researchers carried out computer simulations of water/ethanol mixtures in the presence of guaiacol to study its interactions.
They found that guaiacol was preferentially associated with ethanol molecules and that in mixtures with concentrations of ethanol up to 45 per cent guaiacol was more likely to be present at the liquid-air interface than in the bulk of the liquid.
"Interestingly, a continued dilution down to 27 per cent resulted in an increase of guaiacol at the liquid-air interface.
"An increased percentage, over 59 per cent, had the opposite effect, that is to say, the ethanol interacted more strongly with the guaiacol, driving the molecule into the solution away from the surface," Friedman said.
These findings suggest that the taste and aroma of guaiacol, and similar compounds in whisky, are enhanced when the spirit is diluted prior to bottling and this taste may be more pronounced on further dilution in the glass.
The research was published in the journal Scientific Reports.
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