Comparison in the gamma-lactone content of oils and extracts from white cypress pine (Callitris glaucophylla Thompson & Johnson)
1999
Doimo, L. | Fletcher, R.J. | D'Arcy, B.R.
The gamma-lactones found in white cypress-pine (Callitris glaucophylla) wood are compounds implicated in termiticidal activity. Distilled oils and solvent extracts from an cypress-pine contained different amounts of gamma-lactones. The distilled oils were poor in gamma-lactones (<10%) while solvent extracts were rich in these compounds (>45%). Oils and extracts contained (-)eudesma-1,4(15),11-triene, beta-selinene and alpha-selinene previously found in other Callitris oils. Six gamma-lactones were identified using GC/MS. They were callitrin, dihydrocolumellarin, callitrisin, columellarin, germacranolide and dihydrocallitrisin. Mass spectroscopy indicated three previously unidentified lactones; two were isomers of callitrisin and the third, an isomer of germacranolide. Chiral gas chromatography separated many enantiomers of lower boiling point components of the distilled oil.
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