Determining the vapour pressures of plant volatiles from gas chromatographic retention data

Vapour pressures and enthalpies of vaporization of a series of the linear n-alkyl-benzenes

“…A number of indirect experimental methods for determination of vapour pressure by using gas chromatography are based on measuring retention times [56,57]. Compared with other methods, the GC technique offers particular advantages in terms of simplicity, speed, small sample size, as well as purity and stability requirements.…”

Seasonal influence on the essential oil production of Nectandra megapotamica (Spreng.) Mez

“…However, along with the sesquiterpenoids, they also help to protect the plant in direct defense against the herbivores and indirectly in attracting the predators or parasitoids (Keeling and Bohlmann 2006;Mumm and Hilker 2006;Xiao et al 2012). Hoskovec et al (2005) demonstrated the high volatility of α-pinene compared to other compounds, which resulted in a high diffusion capacity in the environment. However, sesquiterpenes are larger, denser and less volatile molecules than the monoterpenes, which often have protective functions, such as the antimicrobial action of bicyclogermacrene (Cysne et al 2005), and the fungitoxicity of germacrene D (Fach et al 2002), among others.…”

Vapor pressures and thermophysical properties of selected monoterpenoids

“…The vapor pressure study of borneol presented in [4] was extended to higher temperatures and the vapor pressure of highertemperature crystalline phase (cr I) was measured. The literature values on the vaporization enthalpy for β-citronellol [18,27], significantly deviating from that developed in this work using the SimCor method, were found to be in error. The thermodynamic properties in the ideal gaseous state for geraniol and β-citronellol were calculated by the methods of statistical thermodynamics in combination with the DFT calculations of fundamental frequencies, molecular geometries, and potential energy profiles of methyl rotations and based on a thorough conformational analysis.…”