Standard solutions of N-heterocyclic compounds in ethanol are extracte
d with pentane at a range of pHs. Pentane extractions are also perform
ed on N-heterocyclic standards in ethanol with addition of Limousin Oa
k extract at a range of concentrations. The effects observed on extrac
tion are collated with sensory assessments. The results obtained would
suggest that pyridines are absent from the aroma of a mature whisky d
ue to its acidity, and that interaction with wood constituents in the
cask does not occur.