查询词典 silica gel

Their pure products of the six compounds were obtained by silica gel column chromatography and recrystallization in propanone solution.

通过硅胶柱色谱分离和重结晶对所得的六种化合物纯化后获得它们的纯化合物。

Take silica gel chromatography eluting with EtOAc / petroleum ether(1:9～5:5). The production was washed several times by MeOH, and dissolved in dimethyl formamide to recrystallize, we got yellow power crystal.

结果：(1)HPLC检测含量大于95％，符合对照品的要求；(2)理化鉴别实验均与文献吻合；(3)紫外、红外、质谱、核磁共振的光谱结果均与文献值一致，确定产物为金松双黄酮。

The literature about the synthesis of the ion exchange and chelating adsorbents used in the off-line separation and preconcentration of the noble metals and the development of the on-line microcolumn separation and preconcentration of the noble metals were reviewed. Four silica gel-based adsorbents with rhodanine, 2-mercaptopyrimidine, 2-mercaptothiazoline and isophenylthiourea as the functional groups were first synthesized and applied to the on-line separation and preconcentration of silver, gold, palladium and platinum for their FAAS determination.

本论文在回顾螯合吸附材料的合成及其在贵金属的离线和流动注射在线预浓集分离发展状况的基础上，首次合成了含罗丹宁、2-巯基嘧啶、2-巯基噻唑啉和异二苯基硫脲等四种以硅胶为载体的螯合吸附剂，并用于银、金、钯和铂的流动注射微填充柱在线预浓集分离、火焰原子吸收光谱分析。

The method comprises: reacting semicarbazide and terephthalaldhydic acid under stirring, and monitoring the end point with silica gel thin layer chromatography to obtain terephthalaldhydic acid semicarbazone.

本发明以氨基脲为原料，在搅拌下与对醛基苯甲酸反应，用硅胶薄层层析法监测反应终点，合成氨基脲缩对醛基苯甲酸。

The results showed that the phosphotungstic had better catalytic activities than the silicotungstic acid. As for the supported HPAs, the silica gel support HPAs' catalytic activities were higher than the activated carbon support HPAs.

实验结果表明：对于非负载型杂多酸催化剂，磷钨杂多酸的催化活性要高于硅钨杂多酸；对于负载型杂多酸催化剂，硅胶负载杂多酸催化剂的催化活性要高于活性炭负载的杂多酸催化剂。

All seals of this machine use the thermostable silica gel.

该机所有密封件均采用耐高温硅胶件。

The phosphorus oxychloride or phosphorus tribromide N, N-dimethylformamide mix and react to form the Vilsmeier reagent used in the reaction. The newly prepared Vilsmeier reagent is added into the reaction bottle provided with the return condenser and the blender; a reaction raw material N, N-dimethylformamide solution expressed in the reaction formula is added into the system; the temperature is risen; the corresponding multi substituting pyridine-2 (1 H)-ketone compound can be made after the column chromatography of the silica gel; the production rate is between 60 and 95 percent according to different reactions.

由三氯氧磷或三溴化磷N，N-二甲基甲酰胺混合获得反应中所用Vilsmeier试剂；将新配制的Vilsmeier试剂加入装有回流冷凝管、搅拌器的反应瓶中，向体系中加入反应通式中表示的一种反应原料的N，N-二甲基甲酰胺溶液，升温，经硅胶柱层析分离得相应的多取代吡啶-2(1H)-酮类化合物，产率视不同反应在60~95％之间。

The fatty oil from the seeds of M. cochinchinensis was extracted with petroleum ether, and the saponification was carried out with potassium hydroxide. The unsaponifiable matter was isolated and purified by silica gel column chromatography, and the structures of their constituents were elucidated by means of IR, MS, 1H-NMR, and authentic chemicals.

石油醚提取脂肪油，氢氧化钾进行皂化反应，对不皂化部分进行硅胶柱色谱的分离和纯化，用IR，MS，1H-NMR等波谱技术和对照品对照等方法进行化合物的结构鉴定。

Experiment was conducted with mature leaves of Zizyphus jujuba Mill. cv. Chuangan (stored at -20℃,-70℃, dried with silica gel) and 3 methods, including CTAB, high salt precipitation and high salt and low pH were used for total DNA extraction for studying their effects on DNA extraction.

以串杆枣的成熟鲜叶为试材，分别采用-20℃、-70℃和硅胶脱水干燥3种方法保存样品，采用简易CTAB法、高盐沉淀法与高盐低pH值法分别对3种方法保存的样品及对照样进行了基因组DNA提取效果的比较分析。

The results of experiments showed that the dehumidifying performance of HMSMC excelled honeycomb monolithic silica gel, especially under high temperature and low humidity conditions.

结果表明：块体硅胶／分子筛复合物的除湿性能明显高于硅胶，尤其在较高温度和较低湿度条件下。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。