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
AIM:To study the chemical constituents of Querc us dentata Thunb..METHOD:These compounds were isolated by using D101,silica gel and Sephadex LH-20 column chromatography.Their chemical stru ctures were comfirmed by UV,...AIM:To study the chemical constituents of Querc us dentata Thunb..METHOD:These compounds were isolated by using D101,silica gel and Sephadex LH-20 column chromatography.Their chemical stru ctures were comfirmed by UV, IR,MS,NMR and compared with reference.RESU LT :These compounds were elucidated as friedelin(1),glutin ol(2), e pifriedelol(3),β-sitosterol (4), oleanolic a cid (5),daucosterol(6), quercilicoside A( 7) and 1,3,4/2,5 -cyclohexanpentaol(8).CONCL USION:Compounds 5～8 were isolated from this plant for th e first time.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AIM:To study the chemical constituents of Querc us dentata Thunb..METHOD:These compounds were isolated by using D101,silica gel and Sephadex LH-20 column chromatography.Their chemical stru ctures were comfirmed by UV, IR,MS,NMR and compared with reference.RESU LT :These compounds were elucidated as friedelin(1),glutin ol(2), e pifriedelol(3),β-sitosterol (4), oleanolic a cid (5),daucosterol(6), quercilicoside A( 7) and 1,3,4/2,5 -cyclohexanpentaol(8).CONCL USION:Compounds 5～8 were isolated from this plant for th e first time.
