查询词典 ethyl acetate

Therefore, the elimination of heptane would require replacement of ethyl acetate by a solvent in which 2 has a lower solubility.

因此，消除烷需更换乙酸乙酯溶剂中2具有低的溶解度。

Properties White powder, inodorous, non-toxic, soluble in dilute alkali solution, carbon disulfide, benzene, acetone, dichloromethane and a little soluble in chloroform, insoluble in alcohol, carbon tetrachloride and ethyl acetate.

性质 白色粉末。无毒、无味。溶于稀碱、二硫化碳、苯、丙酮和二氯甲烷，微溶于氯仿，难溶于乙醇、四氯化碳、醋酸乙酯。

The control group were fed basal diet, group 1 to 3 were fed basal diet supplemented with 90,100,110 mg/kg of Lespedeza Bicolor crude extract, group 4 to 6 were fed basal diet supplemented with 60,70,80 mg/kg of ethyl acetate extract, group 7 to 9 were fed basal diet supplemented with 60,70,80 mg/kg of n-butanol extract.

试验期42 d。对照组饲喂基础日粮，1～3 组饲喂基础日粮加二色胡枝子粗提物90、100、110 mg/kg；4～6 组饲喂基础日粮加二色胡枝子乙酸乙酯萃取物60、70、80 mg/kg；7～9 组饲喂基础日粮加二色胡枝子正丁醇萃取物60、70、80 mg/kg。

The compound of the invention is produced by drying 5Kg of malaytea scurfpea fruit seeds, and cold soaing and extracting for four times by 70% industrial alcohol, decompressing and concentrating lixivium to obtain alcohol extract, mixing by adding a right amount of water and extracting by using Sherwood oil and ethyl acetate.

本发明化合物是干燥补骨脂种子5Kg，用70％工业乙醇冷浸提取四次，浸出液减压浓缩得乙醇提取物，加适量水混溶，依次用石油醚、乙酸乙酯萃取。

Methods Star anise were extracted from Illicium verum Hook.f. using ethanol and ethyl acetate as solvents. After macron absorption resin layer separation, a kind of white fine powder shikimic acid were obtained. The extracted shikimic acid were determined for chemical qualitative analysis.

采用乙醇提取、乙酸乙酯等有机溶剂萃取八角茴香，经大孔吸附树脂柱分离，得到白色精细粉末的莽草酸，并对莽草酸进行化学定性分析，镇痛实验采用扭体法和温浴法，观察腹腔注射莽草酸溶液后小鼠痛阈潜伏期和扭体反应的次数，设阿司匹林和生理盐水为对照组。

Methods Star anise were extracted from Illicium verum Hook.f. using ethanol and ethyl acetate as solvents. After macron absorption resin layer separation, a kind of white fine powder shikimic acid were obtained. The extracted shikimic acid were determined for chemical qualitative analysis. Writhing test and warm bathing test were performed and observed the mice pain threshold latency and writhing reaction times after giving peritoneal shikimic acid extraction solutions.

采用乙醇提取、乙酸乙酯等有机溶剂萃取八角茴香，经大孔吸附树脂柱分离，得到白色精细粉末的莽草酸，并对莽草酸进行化学定性分析，镇痛实验采用扭体法和温浴法，观察腹腔注射莽草酸溶液后小鼠痛阈潜伏期和扭体反应的次数，设阿司匹林和生理盐水为对照组。

The mob ile phase is a mixture of methyl alcohol and ethyl acetate and water(40:20:40,v/ v).

对萃取条件和萃取百分率，色谱分离条件进行了研究，讨论了测定的灵敏度、选择性和重现性。

Ethyl acetate is a good solvent for nitrocellulose with negative .chi.

乙酸乙酯是硝化纤维素的良好溶剂，其。chi。

It can also provide good specimen in cardiovascular learing. Perchloroethylene ethyl acetate plastics filler perfusion is a good technique in making specimen.

该方法能够制作出完整的心脏动脉铸型和局部房室结动脉铸型，标本利于观察分析血管走行及分布，并为解剖实验学习心血管课程提供良好的铸型标本。

Methods Twenty fresh pig hearts,perfusing with perchloroethylene ethyl acetate plastics filler locally,to show the stracture and the ramust of the left and right coronary artery and solid structure of the artioventricular artery sufficiently.

方法新鲜猪心20例，用过氯乙烯-乙酸乙酯填充剂灌注，制作心脏动脉铸型和局部房室结动脉铸型，充分显示左右冠状动脉及其细小分支和房室结动脉的立体构筑。

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。