Betts TJ. Chemical characterisation of the different types of volatile oil constituents by various solute retention ratios with the use of conventional and novel commercial gas chromatographic stationary phases.
J Chromatogr A 2001;
936:33-46. [PMID:
11761004 DOI:
10.1016/s0021-9673(01)01284-5]
[Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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, gamma-DA/alpha-DA ratios can indicate a bicyclic or monocyclic monoterpenoid. Temperature change on alpha-DA can pick out a non-alcoholic saturated cyclic monoterpenoid, using 150/125 degrees 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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