  We explore the interplay between tunneling process and chiral interactions in
the discrimination of chiral states for an ensemble of molecules in a
biological environment. Each molecule is described by an asymmetric double-well
potential and the environment is modeled as a bath of harmonic oscillators. We
carefully analyze different time-scales appearing in the resulting master
equation at both weak- and strong-coupling limits. The corresponding results
are accompanied by a set of coupled differential equations characterizing
optical activity of the molecules. We show that, at the weak-coupling limit,
chiral interactions prohibit the coherent racemization induced by decoherence
effects and thus preserve the initial chiral state. At the strong-coupling
limit, considering the memory effects of the environment, Markovian behavior is
observed at long times.
