The vapor pressure and vaporization enthalpy of (-) b-Elemene and (-) b-Bisabolene by correlation gas chromatography

The vaporization enthalpies and vapor pressures of (-) beta-elemene and (-) beta-bisabolene are evaluated by correlation gas chromatography using two sets of standards, a mixture of various cyclic hydrocarbons and a series of n-alkanes. Both compounds are sesquiterpenes found in a variety of plants. beta-Elemene has been used in China for the treatment of a variety of cancers. beta-Bisabolene is used as a flavoring agent and it has also been shown to exhibit cytotoxicity in breast cancer cell lines, both in vitro and in vivo. Vaporization enthalpies of [(66.8 +/- 3.0) and (73.9 +/- 3.0)] kJ.mol(-1) and vapor pressures of [(3.1 +/- 1.0) and (0.72 +/- 0.2)] Pa at T = 298.15 K have been evaluated for (-) beta-elemene and (-) beta-bisabolene, respectively. Vapor pressures were also evaluated as a function of temperature from T = (298.15-450) K and fit to a second order polynomial. (C) 2020 Elsevier Ltd.