Yield and chemical composition of essential oil from Salvia officinalis L. in third year of cultivation
The study upon sage (Salvia officinalis L.) has been carried out at the Experimental Section of Department of Vegetables and Medicinal Plants, University of Life Sciences in Lublin. The aim of present study was to evaluate the yield and chemical composition of essential oil extracted from sage leaves harvested from a three-year plantation. The sage herb harvest date in the third year of cultivation had a significant impact on the yield of plants. Higher yield of fresh and dry herb, dry leaves, and essential oil was achieved in August (the second harvest time) than in May (the first harvest time). Chromatographic examination indicated the presence of 50 chemical compounds in sage essential oil. It was a variable percentage of essential oil components depending on the raw material harvest time. The main components of the sage essential oil were: 1,8-cineole (16.08–18.04%), α-thujone (10.40–21.51%) and camphor (5.24–18.08%).