A study of the thermochemical properties of the major sesquiterpenes in German chamomile and cypriol oil by correlation gas chromatography

The vaporization enthalpies at T = 298.15 K and vapor pressures from T = (298.15 − 450) K of the major hydrocarbon components in chamomile and cypriol are evaluated by correlation gas chromatography. The components in chamomile include the following four substances: (E, E) α-farnesene, E β-farnesene, bicyclogermacrene and germacrene-D. In cypriol, similar properties have been evaluated for cyperene, α-copaene, and rotundene. Both chamomile and cypriol have been used in the practice of traditional medicine.