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The continuing debate over the basis of odorant recognition with respect to the molecular shape (“lock and key”) theory versus the vibrational theory could potentially be resolved by the testing of  13 C-labeled odorants. The application of  13 C isotopomers is discussed herein by means of DFT-calculated IR vibrations and Gibbs' free energies (Δ G ) for acetophenone and octan-1-ol, two odorants for which the  2 D (deuterium) isotopomers have previously been shown to be discernible from their respective  1 H (normal) counterparts by  Drosophila melanogaster .

The Potential of Isotopomers as a Test for the Vibrational Theory of Olfactory Sense Recognition