Two new secolignans (1 and 2) were isolated from the roots of Urtica mairei Levi. The structures of these two compounds were determined on the basis of extensive spectroscopic methods including HR-EI-MS, 1D and 2D N...Two new secolignans (1 and 2) were isolated from the roots of Urtica mairei Levi. The structures of these two compounds were determined on the basis of extensive spectroscopic methods including HR-EI-MS, 1D and 2D NMR experiments.展开更多
目的:优化南方红豆杉[Taxus mairei(Lemee et Levl.)S.Y.Hu ex Liu]枝叶中总黄酮的微波提取工艺。方法:在单因素实验基础上,采用响应面分析法对影响南方红豆杉枝叶中总黄酮提取率的主要因素(提取时间、料液比和乙醇体积分数)进行优化,...目的:优化南方红豆杉[Taxus mairei(Lemee et Levl.)S.Y.Hu ex Liu]枝叶中总黄酮的微波提取工艺。方法:在单因素实验基础上,采用响应面分析法对影响南方红豆杉枝叶中总黄酮提取率的主要因素(提取时间、料液比和乙醇体积分数)进行优化,建立影响因素与响应值之间的数学模型,确定最佳微波提取工艺条件。结果:南方红豆杉枝叶中总黄酮最佳微波提取工艺为:料液比27.39(V/W),乙醇体积分数61.44%,提取时间15.27min,微波频率1 887MHz。结论:采用响应面法对南方红豆杉中总黄酮的提取条件进行优化,该方法合理可靠,为生产工艺提供理论依据。展开更多
基金the NSFC project(No.30572317)research project of the Educational Department of Liaoning Province(No.2004F114)for the financial supports.
文摘Two new secolignans (1 and 2) were isolated from the roots of Urtica mairei Levi. The structures of these two compounds were determined on the basis of extensive spectroscopic methods including HR-EI-MS, 1D and 2D NMR experiments.
文摘目的:优化南方红豆杉[Taxus mairei(Lemee et Levl.)S.Y.Hu ex Liu]枝叶中总黄酮的微波提取工艺。方法:在单因素实验基础上,采用响应面分析法对影响南方红豆杉枝叶中总黄酮提取率的主要因素(提取时间、料液比和乙醇体积分数)进行优化,建立影响因素与响应值之间的数学模型,确定最佳微波提取工艺条件。结果:南方红豆杉枝叶中总黄酮最佳微波提取工艺为:料液比27.39(V/W),乙醇体积分数61.44%,提取时间15.27min,微波频率1 887MHz。结论:采用响应面法对南方红豆杉中总黄酮的提取条件进行优化,该方法合理可靠,为生产工艺提供理论依据。