CRISTIAN MOISA, ANDREEA LUPITU, GEORGETA POP, DORINA RODICA CHAMBRE, LUCIAN COPOLOVICI, GABRIELA CIOCA, SIMONA BUNGAU, DANA MARIA COPOLOVICI VARIATION OF THE CHEMICAL COMPOSITION OF THYMUS VULGARIS ESSENTIAL OILS BY PHENOLOGICAL STAGES Thymus vulgaris essential oil is one of the most common oils used mainly in food industry but it could also have applications in medicine and pharmacy. The chemical composition of this essential oil depends on the plant material harvesting time, phenomenological stages, meteorological conditions and growing area of plants. In our study, four different Thymus vulgaris L. var. Donne Valley essential oils have been extracted and characterised. The essential oils have been extracted from plants before and after flowering in two different years. There is an important difference between the chemical composition of oils obtained from plants harvested before and after flowering. Thymol and carvacrol have been found as the major components, but the percentage depends on the phenological stages of the plants and the year of harvesting. Furthermore, the composition of the minor components changed.
Keywords: essential oils, chemical composition, Thymus vulgaris L., phenological stages of plants