Essential oil composition of Hypericum L. species from Southeastern Serbia and their chemotaxonomy

Chemical composition of Hypericum perforatum L. Essential oil

“…It is dificult to compare the published results, having in mind the fact that authors analyzed the plant material from various regions, characterized by their specific enviromental and ecological factors, and in many cases phenological phase of the analyzed plant material was not given. Some authors stated different chemical compositions of H. perforatum essential oils depending on the plant organs examined (leaves, flowers, stems) [28,41]. Moreover, the differences in the composition of essential oils may originate from different varieties within the same species [27], and as in most papers this taxonomic category was not given, the comparison of essential oils becomes more difficult.…”

Essential Oil Composition of Five Endemic Hypericum Species from Turkey

“…Comparing the main constituent of the H. uniglandulosum oil to the other studies, the following are observed: 2,6-Dimethyl-3,5-heptadien-2-one was found to be the major component only in H. tetrapterum from Serbia [20].…”

“…Among the previous studies about Hypericum essential oils from Turkey, many taxa were characterized by the high amount of α-pinene [11,20,[22][23][24][25][26][27][28][29][30] [21]. α-pinene, baeckeol, limonene and spathulenol were identified as major components in H. thymopsis, although baeckeol and limonene were not determined in a previous study.…”

Recent advances on supercritical fluid extraction of essential oils

“…The steam distillation is a traditional technique for essential oils (Demorais et al, 2007;Smelcerovic et al, 2007;Telascrea et al, 2007;Di Leo Lira et al, 2009;Jeong et al, 2009). This is a very simple process, but suffers of many drawbacks: Thermal degradation, hydrolysis and solubilization in water of some compounds that alter the flavour and fragrance profile of many essential oils extracted by this technique.…”