[Objective] This research aimed to establish an inductively coupled plasma mass spectrometry （ICP-MS） method for determination of five kinds of heavy metals （Pb, Cd, Cu, As and Hg） in Dendrobium candidium Wall. ex...[Objective] This research aimed to establish an inductively coupled plasma mass spectrometry （ICP-MS） method for determination of five kinds of heavy metals （Pb, Cd, Cu, As and Hg） in Dendrobium candidium Wall. ex Lindl. [Method] The samples were digested in HNO3-H202 acids system by closed vessel microwave di- gestion. At the same time, internal standard was added to avoid the matrix effect. [Result] The five kinds of heavy meals all showed good linear relationships, and the correlation coefficients ranged from 0.998 2 to 0.999 9. The detection limits of the five kinds of heavy metals were in the range of 0.008-0.750 μg/L, while the stan- dard recovery rates were in the range of 90.4%-96.9%. The relative standard devi- ations ranged from 1.6% to 8.2%. The heavy metals in the Ginseng and Astragalus national standard samples were determined by the established ICP-MS method, and the results were in conformity with the standard values. [Conclusion] The established method has simple and convenient operation and accurate and reliable results, and it meets the requirements by determination of heavy metals in Dendrobium candididium Wall. ex Lindl.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
目的:采用中心组合(Box-Behnken)设计优选南方红豆杉[Taxus mairei(Lemee et Levl.)S.Y.Hu ex Liu]枝条中多糖的微波提取工艺。方法:在单因素实验基础上,采用Box-Behnken设计对影响南方红豆杉枝条中多糖提取率的主要因素(料液比、提取...目的:采用中心组合(Box-Behnken)设计优选南方红豆杉[Taxus mairei(Lemee et Levl.)S.Y.Hu ex Liu]枝条中多糖的微波提取工艺。方法:在单因素实验基础上,采用Box-Behnken设计对影响南方红豆杉枝条中多糖提取率的主要因素(料液比、提取时间、提取次数)进行优化,建立影响因素与响应值之间的数学模型,确定最佳超声提取工艺条件。结果:南方红豆杉枝条中多糖最佳超声提取工艺为:料液比21.48(V/W),提取时间13.78 min,提取次数3次,微波频率为1887MHz。结论:采用响应面法对南方红豆杉中多糖的提取条件进行优化,该方法合理可靠,能为生产工艺提供理论依据。展开更多
研究不同注射液体、注射量对于微波消融温度场的影响。在加热功率60 W、加热时间10 min的情况下,利用新型注射型微波天线进行消融离体肝脏的实验研究,并且于加热过程中分别注射生理盐水和无水乙醇液体,注射量依次为0、10、20 m L。根据...研究不同注射液体、注射量对于微波消融温度场的影响。在加热功率60 W、加热时间10 min的情况下,利用新型注射型微波天线进行消融离体肝脏的实验研究,并且于加热过程中分别注射生理盐水和无水乙醇液体,注射量依次为0、10、20 m L。根据测温针采集的温度数据,利用Matlab计算消融区域的范围（高于60℃区域）。通过对离体肝脏的消融面积、体积、横径和纵径的测量和统计,发现注射两种液体均可有效增大消融范围,与无液体注射相比面积增大率的范围在29.1%~72.0%之间,体积增加率在45.2%~141.8%之间;当注射液体体积由10 m L增加到20 m L时,生理盐水组的面积增加率为8.8%,无水乙醇组的面积增加率为28.8%。因此,联合液体注射可以扩大微波消融范围,并且随着注射体积的增加,消融范围扩大;微波联合无水乙醇的注射效果要略好于生理盐水。展开更多
文摘[Objective] This research aimed to establish an inductively coupled plasma mass spectrometry （ICP-MS） method for determination of five kinds of heavy metals （Pb, Cd, Cu, As and Hg） in Dendrobium candidium Wall. ex Lindl. [Method] The samples were digested in HNO3-H202 acids system by closed vessel microwave di- gestion. At the same time, internal standard was added to avoid the matrix effect. [Result] The five kinds of heavy meals all showed good linear relationships, and the correlation coefficients ranged from 0.998 2 to 0.999 9. The detection limits of the five kinds of heavy metals were in the range of 0.008-0.750 μg/L, while the stan- dard recovery rates were in the range of 90.4%-96.9%. The relative standard devi- ations ranged from 1.6% to 8.2%. The heavy metals in the Ginseng and Astragalus national standard samples were determined by the established ICP-MS method, and the results were in conformity with the standard values. [Conclusion] The established method has simple and convenient operation and accurate and reliable results, and it meets the requirements by determination of heavy metals in Dendrobium candididium Wall. ex Lindl.
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。
文摘目的:采用中心组合(Box-Behnken)设计优选南方红豆杉[Taxus mairei(Lemee et Levl.)S.Y.Hu ex Liu]枝条中多糖的微波提取工艺。方法:在单因素实验基础上,采用Box-Behnken设计对影响南方红豆杉枝条中多糖提取率的主要因素(料液比、提取时间、提取次数)进行优化,建立影响因素与响应值之间的数学模型,确定最佳超声提取工艺条件。结果:南方红豆杉枝条中多糖最佳超声提取工艺为:料液比21.48(V/W),提取时间13.78 min,提取次数3次,微波频率为1887MHz。结论:采用响应面法对南方红豆杉中多糖的提取条件进行优化,该方法合理可靠,能为生产工艺提供理论依据。
文摘研究不同注射液体、注射量对于微波消融温度场的影响。在加热功率60 W、加热时间10 min的情况下,利用新型注射型微波天线进行消融离体肝脏的实验研究,并且于加热过程中分别注射生理盐水和无水乙醇液体,注射量依次为0、10、20 m L。根据测温针采集的温度数据,利用Matlab计算消融区域的范围（高于60℃区域）。通过对离体肝脏的消融面积、体积、横径和纵径的测量和统计,发现注射两种液体均可有效增大消融范围,与无液体注射相比面积增大率的范围在29.1%~72.0%之间,体积增加率在45.2%~141.8%之间;当注射液体体积由10 m L增加到20 m L时,生理盐水组的面积增加率为8.8%,无水乙醇组的面积增加率为28.8%。因此,联合液体注射可以扩大微波消融范围,并且随着注射体积的增加,消融范围扩大;微波联合无水乙醇的注射效果要略好于生理盐水。
