Abstract
Retention ratios of an unknown solute peak from a volatile oil can help to identify its chemical type. Relative retentions on conventional stationary phases can be used to calculate a polar/non-polar ratio which may suggest it is an aromatic solute or a sesquiterpene hydrocarbon. With dipentyl (DA) cyclodextrin phases, γ-DA/α-DA ratios can indicate a bicyclic or monocyclic monoterpenoid. Temperature change on α-DA can pick out a non-alcoholic saturated cyclic monoterpenoid, using 150/125°C. Twenty retention ratios are reviewed involving various phases, including other modified cyclodextrins, liquid crystals, “Chirasil-Val” and crown ethers. Applications to six volatile oils are made using a variety of phases.
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