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    The effect of harvest periods on chemical composition of essential oil of mint (Mentha spicoto L.) leaves
    (Agrimedia, 2015) Figueredo G.; Chalchat J.C.; Chalard P.; Al Juhaimi, Fahad Y.; Ghafoor K.; Babiker, Elfadil E.; Özcan, Mehmet Musa
    The essential oils of mint leaves (Mentha spicata L.) cultivated in Middle Anatolia were extracted by hydrodistillation, and analysed by GC and GC-MS. The percentage yields of the essential oils of mint harvested in different months (from May to December) were 1.2 %, 2.5%. 2.75%,3.0%, 2.0%, 3.7%. 2.6% and 2.0%, respectively. The major constituents varied depend on harvest periods. The main constituents of mint oil were carvone (30.8-62.9%), dihydrocarveol (2.7%-22.4, iso dihydrocarvyle acetate (12-14.4%). limonene (5.2-17.2%) and eucalyptol among the months.
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    The effect of harvest years on chemical composition of essential oil of pickling herb (Echinophora tenuifolia subsp. Sibthorpiana) leaves used as medicinal plant
    (Akademiai Kiado Rt., 2011) Chalchat J.; Özcan M.; Figueredo G.; Chalard P.
    The essential oils of leaves of Echinophora tenuifolia subsp. sibthorpiana (Apiaceae) growing wild in Middle Anatolia were obtained by hydrodistillation, and analysed by gas chromatography (GC) and gas chromatography-mass spectrometer (GC-MS). The major constituents were affected depend on harvest years. Methyl-eugenol, ?-3-carene and p-cymene were established as the major components of pickling herb leaves collected between 2003 and 2009. The main constituents of leave oil were methyl-eugenol (24.99% to 90.16%), ?-3-carene (2.57% to 34.80%) and p-cymene (1.23% to 9.81%) depending on the harvest years.