查询词典 acetone

Deoxybenzoin(3) was prepareded by using the resorcinol and substituted phenylacetic as starting meterials in microwave-mediated.Then the compound(3) was reacted with acetic anhydride to produce(4).The compound(4) was hydrolyzed to convert compound(5) in the acid-mediated. The compound(5) was reacted with the 1,2-dibromo-ethane and 1,3-dibromo-propane in refluxed condition with acetone as solvent to give(6) or(7),respectively.Lastly,the title compounds were synthesized by refluxing(6) or(7) with 2-methyl-benzimidazole and potassium carbonate in acetone solution.

以取代苯乙酸和间苯二酚为起始原料，用微波辐射法合成脱氧安息香(3)，(3)与乙酸酐缩合生成2-甲基-7-乙酰氧基异黄酮(4)，(4)在酸性条件下水解生成相应的异黄酮(5)，化合物(5)分别与1，2-二溴乙烷和1，3-二溴丙烷反应生成(6)和(7)，化合物(6)和(7)再分别与2-甲基苯并咪唑偶合生成目标化合物。

In order to recrystallize, we add ice -block to the acetone solution of isoflavone, which has equal volume to acetone, then putting the solution into refrigerator all the night.

三种试验样品对人体的血细胞膜都有较强的保护作用，并在较高浓度时仍具有抗溶血活性。

The result indicates that the best method for extracting β-carotene is to saponify the test specimen one hour with 4% NaOH methyl alcohol solution in 60-70'c and then to separate with 3:7 acetone-benzine component solvent as extraction solvent, MgO as the absorbent, the acetone-benzine as the eluent. Extracted solvent has been determined in the color dish condition (1cm) by ultraviolet spectrophotometer at 447 nm. The result shows that the β-carotene in carrotis 0.134 mgg^(-1), 0.0863mgg^(-1) in red pepper and 0.0426 mgg^(-1) in spinach.

结果表明，比较优先的β-胡萝卜素提取方法是：试样用4% NaOH甲醇溶液在60℃~70℃皂化1h，用3：7的丙酮－石油醚混合溶剂提取，以Mgo为吸附剂，丙酮－石油醚为洗脱剂分离，提取液用紫外分光光度计在波长447nm，1cm比色皿条件下测定，得出蔬菜中β-胡萝卜素含量：胡萝卜为0.134mgg^(-1)，红椒为0.0863mgg^(-1)，菠菜为0.426mgg^(-1)。

To 10 g of the substance being examined, coarsely powdered, add 100 ml of acetone R and allow to stand for 20 min. Add 1 ml of a solution containing 1.8 μg/ml of carbophenothion R in toluene R. Homogenise using a high-speed blender for 3 min. Filter and wash the filter cake with two quantities, each of 25 ml, of acetone R.

称取10g的检测样品，粉碎成粗粉，加入丙酮100ml，静止20min，加入1.8ug/ml的三硫磷-甲苯混合溶液1ml，高速搅拌3分钟，过滤，用丙酮洗涤滤纸两次，每次25ml。

The results show the hydrogen bonding is formed between acetone and water molecules and the strength of hydrogen bonging is related to the concentration of acetone.

由此说明丙酮与水分子间形成了氢键，而且氢键的强弱与丙酮水溶液的浓度有关。

Fresh carrot, tomato and chili were used as test samples, absolute alcohol were used in process of triturating and dehydrating, acetone were used for extraction, all of the alcohol solution and acetone solution were commixed, and the content of β-carotene were directly determined by HPLC.

选用胡萝卜、番茄和红辣椒三种常见新鲜果蔬作为供试品，采用无水乙醇匀浆、脱水，丙酮提取-直接定容的方法制备供试品溶液，使用高效液相色谱法测定供试品中β-胡萝卜素的含量。

MethodThe qualitative analysis to the acetone extractives of silver chain wood before and after discoloring was carried on showing the main components of the acetone extractives and then taking comparison.

方法］通过对刺槐木材变色前后丙酮抽出物的定性分析，得出变色前后丙酮抽出物的主要成分，进行对比分析，初步得出抽出物对诱发变色的作用。

METHODS:Based on the extraction rate of chlorophyll,acetone method was compared with alcohol method and the preparing factors of acetone method was optimized by orthogonal design.

以叶绿素提取率为指标，对脱镁叶绿酸制备的乙醇法和丙酮法工艺进行比较，用正交试验法对丙酮法的工艺条件进行优化。

CoFe2O4 is sensitive to low concentration alcohol and acetone, for other gases it has not sensitivity, so this material may be used to inspect low concentration alcohol and acetone.

研究发现，CoFe_2O_4制作的元件对低浓度的乙醇和丙酮气体有较好的灵敏性，对其他气体基本没有气敏性，因此，该材料可用于上述两种气体的低浓度检测；在乙醇和丙酮的低浓度范围内，两种气体的浓度与该元件的灵敏度呈良好的线性关系。

Solubility of barium chloride and barium oxide in hydrochloric acid, ethanol,acetone,ether and hydrochloric acid- ethanol,hydrochloric acid- acetone,hydrochlo- ric acid- ether has beeen studied and the separation of Ba O from Ba Cl\- 2 with hydrochloric acidethanol as the solvent has been proposed.

研究了氯化钡和氧化钡在盐酸、乙醇、丙酮、乙醚及盐酸-乙醇、盐酸-丙酮、盐酸-乙醚中的溶解性，提出以盐酸-乙醇为溶剂进行两者的分离。以 DBC- CPA为显色剂分光光度法测定氧化钡的含量，加料回收率为 98%～ 10 2 %，氧化钡含量为 0 。32 %时，平行测定 7次，相对标准偏差为 1。 58%。该法适于快速测定热处理盐浴中氧化钡的含量，对监控盐浴品质有指导意义

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。