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Plasma Chemistry and Plasma Processing -  相似文献   

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Chen  C. Y.  Kao  C. L.  Yeh  H. C.  Li  H. T.  Wu  M. D.  Cheng  M. J.  Li  W. J. 《Chemistry of Natural Compounds》2022,58(3):385-386
Chemistry of Natural Compounds - A new ketone, vicamazone (4-(2-butoxyethoxy)-4-methylpentan-2-one) (1), was isolated from the leaves of Victoria amazonica (Nymphaeaceae). The structure of the new...  相似文献   

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一、概况在澳大利亚,教育行政体制属于地方分权制,各州根据本地区的具体情况,独立自主地经营管理学校,它可以制定政策以及各种教育条例,因此,各州之间存在着差异。各州又根据州的法律,把学校的大部分实际管理权委托给下一级地方教育行政当局,而且最基层的学校在决定课程设置等方面享有很大的自主权,所以,在澳大利亚很难实行全国统一的课程设置、教学大纲以及教科书等,各地自主办学。  相似文献   

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Two new sucrose esters, β-D-(1-O-acetyl-3,6-O-trans-diferuloyl)fructofuranosyl-α-D-2′-O-acetylglucopyranoside (1) and β-D-(1-O-acetyl-3-O-cis-feruloyl-6-O-trans-feruloyl)fructofuranosyl-α-D-2′,4′,6′-O-triacetylglucopyranoside (2), together with four known sucrose esters (36) have been isolated from the rhizome of Sparganium stoloniferum Buch.-Ham. Their structures were elucidated by physical and chemical evidence and spectral analysis.  相似文献   

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The ethyl acetate extract of the rhizomes of Luvunga scandens (Roxb.) Buch. - Ham. ex Wight &; Arn (Rutaceae) delivered one new acridone alkaloid named Luvungaside A (1) together with three known acridone alkaloids, namely 1,3-dihydroxy-2-methoxy-10-methyl-9-acridone (2), arborinine (3) and 1-hydroxy-3-methoxy-10-methyl-9-acridone (4). Compounds were reported for the first time from the species L. scandens applying various chromatography methods. Chemical structures were elucidated by IR, UV, HR-ESI-MS, NMR 1D &; 2D experiments and comparison with the literature. The cytotoxicity and hepatoprotective activity of compounds 14 in human hepatoma cell line HepG2 was measured by MTT assay. At 10–100?μM, compounds expressed significant hepatoprotective effect with prevention percentage ranging from 81.1% to 194.3%, compared to the positive control quercetin displaying 49.0%.  相似文献   

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千里光中几种黄酮和酚酸类成分的分离与鉴定   总被引:2,自引:0,他引:2  
何忠梅  宗颖  孙佳明  肖凤艳 《应用化学》2010,27(12):1486-1488
对千里光(Senecio scandens Buch.-Ham.)全草的乙酸乙酯提取部位进一步分离,得到4个黄酮类化合物和2个酚酸类化合物,经理化性质和NMR及MS谱学数据鉴定分别为槲皮素3-O-β-D-葡萄糖苷(Ⅰ)、金丝桃苷(Ⅱ)、槲皮素(Ⅴ)、异鼠李素(Ⅵ)、绿原酸(Ⅲ)和咖啡酸(Ⅳ)。 其中化合物Ⅰ~Ⅵ均为首次从千里光属植物中分离鉴定。  相似文献   

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