Published: Journal of Chromatographic Science, Volume 36, Number 1, January 1998, pp. 37-43.
Determination of the Enantiomeric
Composition of Limonene and Limonene-1,2-epoxide in Lemon Peel by
Multidimensional Gas Chromatography with Flame-Ionization
Detection and Selected Ion Monitoring Mass Spectrometry
G.P. Blanch and G.J. Nicholson
The enantiomeric excess of limonene and limonene-1,2-epoxide in lemon peel samples is determined. The enantiomers were separated by multidimensional gas chromatography with flame ionization detection and gas chromatography–mass spectrometry in the selected ion monitoring mode. With this system, it is possible to measure limonene-1,2-epoxide, which appears at low concentrations in lemon peel. The enantiomeric excess of R-(+)-limonene in lemon peel is between 97.1 and 97.4% and that of (1S,2R,4R)-(+)-limonene-1,2-epoxide is between 88.0 and 91.9%. The quantitative determination of limonene in lemon peel is carried out using the optical antipode of the limonene to be quantitated as an internal standard.
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