Abstract

In this study, the diurnal variability of essential oil components of the species Hypericum perfoliatum was investigated. To determine diurnal variation, during the flowering period collection was carried out at three different times of the day (9a.m., 12a.m., 4p.m.). As a result of this research, it was aimed to determine the most appropriate harvest time during the day. The essential oil components were analyzed using GC-MS device after the production of essential oil was determined by hydrodystylation method. The main components of essential oils were found to contain mainly α-pinene (41.2%), β-pinene (6.2%), n-nonane (5.6%), ϒ-muurolene (4.7%), α-calacorene (4.2%), δ-cadinene (3.7%), n-undecane (3.2%) and caryophyllene oxide (3.1%).

Keywords: Hypericum; Diurnal;Essential oil;α-pinene