Evolution and Occurrence of 1,8-Cineole (Eucalyptol) in Australian Wine
Dimitra L. Capone, Katryna A. van Leeuwen, Dennis K. Taylor, David W. Jeffery, Kevin H. Pardon, Gordon M. Elsey +1 more
Journal of Agricultural and Food Chemistry
Abstract
A new method has been developed for the quantitation of 1,8-cineole in red and white wines using headspace solid-phase microextraction (SPME) combined with stable isotope dilution analysis (SIDA) and gas chromatography-mass spectrometry (GC-MS). An extensive survey of Australian wines (44 white and 146 red) highlighted that only red wines contained significant amounts of 1,8-cineole (up to 20 μg/L). Hydrolytic studies with limonene and α-terpineol, putative precursors to 1,8-cineole, showed a very low conversion into 1,8-cineole (< 0.6%) over a 2 year period, which does not account for the difference between white and red wines. 1,8-Cineole was chemically stable in model wine solution over 2 years, and absorption from a Shiraz wine by bottle closures was most evident for a synthetic closure only (14% absorption after 1 year). Two commercial ferments at two different locations were monitored daily to investigate the evolution of 1,8-cineole throughout fermentation. Both ferments showed daily increases in 1,8-cineole concentration while in contact with grape solids, but this accumulation ceased immediately after pressing. This observation is consistent with the extraction of 1,8-cineole into the ferment from the solid portions of the grape berries.
Extracted Claims
9 claims extracted from this paper into the knowledge graph
1,8-cineole is absorbed by synthetic closure
“Absorption from a Shiraz wine by bottle closures was most evident for a synthetic closure only (14% absorption after 1 year).”
1,8-cineole is not found in white wines
“An extensive survey of Australian wines (44 white and 146 red) highlighted that only red wines contained significant amounts of 1,8-cineole (up to 20 μg/L).”
Limonene and α-terpineol convert into 1,8-cineole
“Hydrolytic studies with limonene and α-terpineol, putative precursors to 1,8-cineole, showed a very low conversion into 1,8-cineole (< 0.6%) over a 2 year period, which does not account for the differ...”