The racemates of all irone isomers (cis-α, trans-α, β, cis-γ, trans-γ) have been resolved by chiral capillary gas chromatography and the separated pure enantiomers have been olfactorily characterized by using GC-sniffing techniques. (+)-cis-γ-Irone and (+)-cis-α-irone were found to have the most interesting organoleptic properties. Application of this analytical method to industrially-produced Orris oils of various origins allowed the differentiation between natural and non-natural qualities.
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Galfré et al. (1993) studied this question.
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