Investigation of the effect of light intensity on five essential oils of Hypericum perforatum L: A case study of Ramsar, Mazandaran, Iran

摘要: 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, measurement was using camera equipped with fish eyes lens. Results tabulated classes: 0 to 20, 20 40, 40 60, 60 80, 80 100%. Flowers studied area sampled, dried, grained, its essences extracted three times for each class. Finally, determining percent, essence analysis by Clevenger machine Gs-Ms technique. indicated that there significant difference between averages EOs classes. α - pinene main compound, maximum average percent mixtures detected classes 100% then 80%. Therefore, increase caused medicine mixture study.   Key words: Hypericum perforatum, light, oils (EOs),