Abstract

The present study investigated five essential oils (EOs) of Hypericum perforatum including α- pinene, myrcene, cineol, tridecane and phytol in different light situation. For this purpose, examinations were done at 700 m heights of the Javaherdeh Forest, Ramsar City, Mazandran Province, Iran. Firstly, light measurement was done using camera equipped with fish eyes lens. Results were tabulated in five light classes: 0 to 20, 20 to 40, 40 to 60, 60 to 80, and 80 to 100%. Flowers of the studied area were sampled, dried, grained, and its essences were extracted three times for each class. Finally, in determining the percent, essence analysis was done by the Clevenger machine and Gs-Ms technique. Results indicated that there was significant difference between the averages of EOs in five light classes. α - pinene was the main compound, and the maximum average percent of mixtures were detected in light classes of 80 to 100% and then 60 to 80%. Therefore, increase of light caused medicine mixture to increase in this study.

Key words: Hypericum perforatum, light, essential oils (EOs), light class.