乙酸乙酯

A method for the determination of residual ethyl acetate in green tea extract has been studied by headspace gas chromatography in order to set up an analysis method.

采用顶空气相色谱法对绿茶提取物中乙酸乙酯残留溶剂的分析方法进行了研究。

The solubility of the novel polyamides are greatly improved compared with the conventional aramids, especially the polyamide with dendritic blocks of the second genernation as side chains are soluble in most of the common organic solvents such as ether, ethyl acetate, chloroform, acetone, tetrahydrafuran etc.

树状片段的引入大大地改善了聚酰胺的溶解性，特别是以第二代树状片段为侧基的聚酰胺的溶解性得到了很大的改进，可以溶于大部分常见的有机溶剂，如乙醚、乙酸乙酯、氯仿、丙酮、四氢呋喃等。

At last, the effective approach was found that the 024-antibiotic can be purified by freez-dry, methyl alcohol soaking, acetone, chloroform, and methyl alcohol continuously washing, alumina and silica gel column chromatography.

粗提制品的理化性质研究表明，024放线菌所产抗生素为无色晶体，易溶于水，可溶于甲醇和乙醇，且在甲醇中的溶解度较大，不溶或难溶于丙酮、氯仿、正丁醇、乙酸乙酯与苯。

Compared the extraction effects of yellow pigment from the corn protein powder by 95 %ethanol,isopropanol,chloroform,acetone,ac-Etylace,petroleum benzene,distilled water.

利用索氏提取法比较95%乙醇、异丙醇、氯仿、丙酮、乙酸乙酯、石油醚和蒸馏水提取玉米粗蛋白粉黄色素的效果，结果发现95%乙醇为最佳溶剂，95%乙醇提取液λmax为446nm。

Results N-hexane ∶acetoacetate ∶95%alcohol(12.8 ∶7.2 ∶2.2)were used as developing agent together with strong aqua ammoniae,in which the thin layer plate was saturated for 40 m...

结果以正己烷-乙酸乙酯-95%乙醇(12.8∶7.2∶2)为展开剂，用浓氨水和展开剂同时饱和40min，展开，取出晾干，以10%浓硫酸-乙醇为显色剂，70℃下加热30min，可获得分离清晰的6个有色斑点。

Chiral ligands mentioned above and their complexes with acetate copper were used as enantio-selective catalysts in asymmetric cyclopropanation reactions of diazoacetate and 1,1-diphenyl ethylene. Investigations indicate that all of them reveal certain optical-selective capability, but chiral C2-symmetric 2,6-bispyridine ligands show better catalytic capability than chiral asymmetric schifF-base ligands.

选择了2个手性2，6-吡啶双噁唑啉配体和6个手性不对称席夫碱配体与醋酸铜形成的配合物作为催化剂，对重氮乙酸乙酯与1，1-二苯乙烯不对称环加成进行催化反应，发现这8个催化剂对1，1-二苯乙烯的不对称环丙烷化反应都表现出了一定的光学活性诱导能力，手性2，6-吡啶双噁唑啉-铜类具有比手性Schiff碱-铜类更好的催化性能。

Three extraction methods including hot water extraction, pectinase enzymolysis, and microwave extraction were compared and their effects on red date wine quality were analyzed.

结果表明，90℃热水浸提，浸提液发酵酒颜色呈枣红色，杂油醇含量最高，有浓郁枣香，但苦味重；果胶酶酶解浸提，浸提液还原糖含量最高，利于发酵，但发酵酒的甲醇含量过高；微波强化浸提，浸提时间和发酵时间最短，所得枣酒的乙酸乙酯含量最高，且有特殊香味。

The maleic and o - phthalic anhydrides and CH3COOC2H5 only lead to partly chlorinesubstituted polysilanes.

而顺丁烯二酸酐、邻苯二甲酸酐和乙酸乙酯则只进行不完全的Cl取代，根据分子活性的不同得到取代比率各不相同的共聚物。

The concents of testosterone and NO of the mouses gavaged with high dosages of Chinese chive extractiong were not significantly more than that of giving middle dosages.This indicated that Chinese chives might be more safe than traditional chinese herbals of sexual improvement function.2、The screening of sexual improvement function chemical substances of Chinese chivesThe crude extract was leached to four phases by petroleum ether, ethyl acetate,n-butanol and water.By doing animal tests to detect the contents of testosterone and NO in serum of mices,the result was showed that the extracts of petroleum ether and n-butanol have sexual improvement function,especial the n-butanol phase.

从小鼠灌喂不同剂量的韭菜提取液试验结果来(来源：ABCa539a5论文网www.abclunwen.com)看，灌胃高剂量的小鼠的睾酮含量和NO含量相对于中剂量来说并不上升，而是保持稳定，因为睾酮含量和NO含量过度上升可能会带来付作用，所以由此可以说明其食用安全性高，副作用小。2、韭菜改善性功能物质的筛选将韭菜粗提物依次通过不同溶剂萃取，分成石油醚、乙酸乙酯、正丁醇和水四个萃取相，通过小鼠灌胃的动物试验，以小鼠血液NO含量和睾酮含量为指标，发现正丁醇和石油醚萃取相中的物质有改善性功能的效果，尤其是正丁醇相效果非常显著。

Half generation PAMAM were separated by the method of colum chromatography with methanol and ethyl acetate as eluents.

利用甲醇和乙酸乙酯混合溶剂作为淋洗剂对半代的树状大分子进行柱层析分离，合成了从- 0.5 G - 4.0 G的PAMAM树状大分子。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。