Thermo-oxidative decomposition of lime, bergamot and cardamom essential oils

Publication date: Available online 9 August 2018Source: Journal of Analytical and Applied PyrolysisAuthor(s): E. Jakab, M. Blazsó, E. Barta-Rajnai, B. Babinszki, Z. Sebestyén, Zs. Czégény, J. Nicol, P. Clayton, K. McAdam, C. LiuAbstractThe thermal decomposition of three essential oils has been studied at 300 °C, using a 9% oxygen in nitrogen atmosphere, to mimic the thermal environment of flavours under low-temperature tobacco heating conditions. The starting compositions of the lime, bergamot and cardamom oils were determined by gas chromatography/mass spectrometry (GC/MS). The thermo-oxidative decomposition was evaluated by applying on-line pyrolysis-GC/MS. The main constituents of the oils studied were cyclic and linear monoterpenoids; however, the relative intensities of these components were characteristically different between oils. Lime oil was dominated by monoterpene hydrocarbons, while the other citrus oil, bergamot oil contained in addition a significant number of esters and alcohols. Oxygen-containing monoterpenoids were the dominant constituents of cardamom oil. The relative proportion of the constituents of all three essential oil samples significantly altered during oxidative pyrolysis at 300 °C. The strained rings of bicyclic monoterpenes (pinenes, sabinene, and thujene) underwent scission, resulting in the formation of monocyclic monoterpenes (limonene etc.). Both linear and cyclic terpene acetates decomposed via elimination of acetic acid, so linal...
Source: Journal of Analytical and Applied Pyrolysis - Category: Chemistry Source Type: research