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We examine the olfactory discrimination of left- and right-handed enantiomersof chiral odorants based on the odorant-mediated electron transport from adonor to an acceptor of the olfactory receptors embodied in a biologicalenvironment. The chiral odorant is effectively described by an asymmetricdouble-well potential whose minima are associated to the left- and right-handedenantiomers. The introduced asymmetry is considered as an overall measure ofchiral interactions. The biological environment is conveniently modeled as abath of harmonic oscillators. The resulting Spin-Boson model is adapted by apolaron transformation to derive the corresponding Born-Markov master equationwith which we obtain the elastic and inelastic electron tunneling rates. Weshow that the inelastic tunneling through left- and right-handed enantiomersoccurs with different rates. The discrimination mechanism depends on the ratioof tunneling frequency to localization frequency.

Dissipative Vibrational Model for Chiral Recognition in Olfaction