Hydrodistillation has commonly been used to recover essential oil from various plant materials,including lavender(Lavandula officinalis) flowers.The main objectives of the present study were to model the kinetics of t...Hydrodistillation has commonly been used to recover essential oil from various plant materials,including lavender(Lavandula officinalis) flowers.The main objectives of the present study were to model the kinetics of the lavender essential oil(LEO) hydrodistillation using a phenomenological model,to evaluate the statistical significance of the hydromodule and hydrodistillation time on LEO yield combining a 4~2 full factorial design with the response surface methodology,to model statistically LEO yield by multiple non-linear regression and to determine the optimal process conditions that provided the maximum LEO yield.The fast-essential oil distillation(washing stage) in the initial period and the slow diffusion stage until the saturation occurring simultaneously were observed,justifying the use of the phenomenological model.With increasing the hydromodule,the saturation LEO yield and the washable fraction of the LEO decreased while the washing and diffusion rate constants increased.Knowledge of the LEO oil yield and the hydrodistillation kinetics is important from the techno-economical point of view.展开更多
Objective:To evaluate toxic activities of essential oils obtained from Rosmarinus officinalis and Lavandula stoechas against the fourth larval instars of Orgyia trigotephras.Methods:A total of 1200 larvae were divided...Objective:To evaluate toxic activities of essential oils obtained from Rosmarinus officinalis and Lavandula stoechas against the fourth larval instars of Orgyia trigotephras.Methods:A total of 1200 larvae were divided into three groups-I,II,III.Group I was to investigate the effect of extracted essential oils from these aromatic plants as gastric disturbance.Bacillus thuringiensis was used as referencee and ethanol as control.Group II was used as contact action and Group III was used as fumigant action.For both Groups II and III,Decis was used as reference and ethanol as control.During the three experiments,the effect of essential oils on larvae was assessed.Results:The chemical composition of essential oils from two medicinal plants was determined,and their insecticidal effects on the fourth larval state of Orgyia trigotephras were assessed.They presented an insecticidal activity.Rosmarinus officinalis essential oil was less efficient compared to Lavandula stoechas.Conclusions:The relationship between the chemical composition and the biological activities is confirmed by the present findings.Therefore the potential uses of these essential oils as bioinsecticides can be considered as an alternative to the use of synthetic products.展开更多
基金funded by the Ministry of Education, Science and Technological Development of the Republic of Serbia (Project assigned to the Faculty of Technology, Leskovac, University of No, Research Group Ⅲ 45001, No. 451-03-68/2020-14/200133)。
文摘Hydrodistillation has commonly been used to recover essential oil from various plant materials,including lavender(Lavandula officinalis) flowers.The main objectives of the present study were to model the kinetics of the lavender essential oil(LEO) hydrodistillation using a phenomenological model,to evaluate the statistical significance of the hydromodule and hydrodistillation time on LEO yield combining a 4~2 full factorial design with the response surface methodology,to model statistically LEO yield by multiple non-linear regression and to determine the optimal process conditions that provided the maximum LEO yield.The fast-essential oil distillation(washing stage) in the initial period and the slow diffusion stage until the saturation occurring simultaneously were observed,justifying the use of the phenomenological model.With increasing the hydromodule,the saturation LEO yield and the washable fraction of the LEO decreased while the washing and diffusion rate constants increased.Knowledge of the LEO oil yield and the hydrodistillation kinetics is important from the techno-economical point of view.
文摘Objective:To evaluate toxic activities of essential oils obtained from Rosmarinus officinalis and Lavandula stoechas against the fourth larval instars of Orgyia trigotephras.Methods:A total of 1200 larvae were divided into three groups-I,II,III.Group I was to investigate the effect of extracted essential oils from these aromatic plants as gastric disturbance.Bacillus thuringiensis was used as referencee and ethanol as control.Group II was used as contact action and Group III was used as fumigant action.For both Groups II and III,Decis was used as reference and ethanol as control.During the three experiments,the effect of essential oils on larvae was assessed.Results:The chemical composition of essential oils from two medicinal plants was determined,and their insecticidal effects on the fourth larval state of Orgyia trigotephras were assessed.They presented an insecticidal activity.Rosmarinus officinalis essential oil was less efficient compared to Lavandula stoechas.Conclusions:The relationship between the chemical composition and the biological activities is confirmed by the present findings.Therefore the potential uses of these essential oils as bioinsecticides can be considered as an alternative to the use of synthetic products.
