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Myrtus communis L. is one of the important aromatic and medicinal species from the Mediterranean area. It is used in various fields such as culinary, cosmetic, pharmaceutical, therapeutic, and industrial applications. Thus, a Box–Wilson experimental plan was used in this study to select the optimal operating conditions in order to obtain high volumes of essential oils. The factorial design method was applied to evaluate at an industrial scale the effect of major process variables on the essential oil extraction from Myrtus communis L. herbs by the steam distillation method. The input variables considered as significant operating conditions were: X1—boiler occupancy rate (boilers were filled to 50%, 75%, and 100%), X2—distillation duration (distillation was continued 60, 75, and 90 min), and X3—particle size (herbs were cut in sizes of 10, 20, and 30 mm via guillotine). The dependent variable selected, coded as Y, was the essential oil volume obtained (mL). The steps of the classical statistical experimental design technique were complemented with the Taguchi method to improve the extraction efficacy of essential oil from Myrtus communis L., and the optimum parameter conditions were selected: boiler occupancy rate 100%, distillation duration 75 min, and particle size 20 mm. Following the optimum parameters, the GC-MS assay revealed for the Myrtus communis L. essential oil two predominant components, α-pinene—33.14% and eucalyptol—55.09%.

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In this study, the effectiveness of different nitrogen doses (0, 3, 6, 9, 12 kg da -1 ), on the essential oil components of the fresh herba of coriander (Coriandrum sativum var. vulgare) populations grown in Hatay conditions was investigated. Methods and Results: Coriander seeds (January 29) were planted in the field. Half of the nitrogen doses were applied with planting, and the other half were applied when the plants were 5-10 cm tall. Plants were harvested on April 13. Fresh herb samples were obtained for 3 hours using Clevenger type apparatus, essential oils were obtained by water distillation and the components of the obtained essential oils were examined with GC-MS. According to the results, the main components in the Gc-Ms analysis were determined as 2-Decenal, 2-Dodecanal, Decanal, Cyclodecanol, 13-Tetradecanal, Dodecanal, 1-Decanol, Undecanol, 2-Tridecenal, for the control parcel and all fertilizer doses. Conclusions: With the increase of fertilizer doses, some of the ratios of the main components detected increased and decreased, while some did not show a large change. Significance and Impact of the Study: In this respect, it is thought that the use of coriander fresh herba essential oil components in antimicrobial studies, as well as the effects of nitrogen applications on the essential oil components of different plants can be supported by future studies.

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