乙酸

DPPH method, pyrogallol method and Fenton reaction were used to study the scavenging ability of extracts with 95% ethanol, ethyl acetate, acetone, acetic acid, chloroform, methanol to free radical activity.

方法］应用DPPH法、邻苯三酚自氧化法和Fenton反应分别研究了浓度95%乙醇、乙酸乙酯、丙酮、乙酸、氯仿、甲醇提取物清除自由基活性的能力。

In view of the existence of the above shortcomings of traditional methods, using acetyl chloride instead of acetic acid as a raw material, do not use any catalyst, not heating, room temperature reaction synthesis of ethyl acetate.

鉴于传统方法存在以上缺点，采用乙酰氯代替乙酸作为原料，不使用任何催化剂，不加热，常温反应来合成乙酸乙酯。

The optimal conditions determineded by experiments were as follow: chloracetic acid : sodium carbonate : isopropyl xanthate : ethylamine=l : 0.58 : 1 : 1.05, water usage is 30 ml/O.lmol chloracetic acid, esterification temperature was 80癈, esterification time was 2h, ammonolysis temperature was 70 C, ammonolysis time was Ih.

实验得出最佳工艺条件为：一氯乙酸：碳酸钠：异丙基黄药：乙胺=1：0.58：1：1.05，水用量为30 ml／0.1mol一氯乙酸，酯化温度80℃，酯化时间2小时，氨解温度70℃，氨解时间1小时。

Continuous use of a disinfectant solution for long periods eventually results in dilution or decreased activ- ity.89 Commercial test kits are available for chlorine, hydrogen peroxide, glutaraldehyde, and peracetic acid to determine whether an effective concentration of active ingredients is present

消毒溶液的长时间持续使用最终导致溶液的稀释或活性降低。商业测试包可以用于测试氯制剂、过氧乙酸、戊二醛和过氧乙酸在重复使用和稀释后活性成分的有效浓度。但是此类测试包的可靠性尚未确定。

The examination made known, when consistence of acetic acid glacial at the 2%, dairy salt concentration 8%~12%, the best way was to be elected.

研究了采用冰乙酸和食盐的混合液作为汤汁的香菇酸盐渍生产工艺、产品检验等，研究表明，冰乙酸浓度2%、食盐浓度8%~12%是香菇酸盐渍的最佳生产工艺条件。

The pots and pans: each batch of take part has joined acetic acid (4%) and the top edge Hing, boiled, 30min 0.5cm, date-stamping, when heated to keep micro-boiling, and finally add acetic acid (4%) to the original volume, placing 24h at room temperature, pour into the above lixivium clean test for forcarbonated.

炊具：每批取二件，分别加入乙酸(4%)至距上边缘0.5cm处，煮沸30min，加热时加盖，保持微沸，最后补充乙酸(4%)至原体积，室温放置24h后，将以上浸泡液倒入清洁的玻璃瓶中供测试用。

Base played a crucial role in this reaction: in the Pd2/L1 catalyzed α-arylation of ethyl malonate, K3PO4 is the base of choice; in the α-arylation of ethyl acetoacetate, K2CO3 is the most effective base.

在这类催化反应中，碱的选择具有重要的影响：以K3PO4为碱， Pd2/L1催化体系在丙二酸二乙酯的α-芳基化中，富电子溴代芳烃显示较好的活性； Pd2/L1催化的乙酰乙酸乙酯α-芳基化时，以 K2CO3为碱，催化体系显示较好的活性，这个催化体系可控制反应得到α-芳基乙酰乙酸乙酯，而不是脱乙酰基的产物。

Base played a crucial role in this reaction: in the Pd2/L1 catalyzed α-arylation of ethy malonate, K3PO4 is the base of choice; in the α-arylation of ethyl acetoacetate, K2CO3 is the most effectiv base.

在这类催化反应中，碱的选择具有重要的影响：以K3PO4为碱，Pd2/L1催化体系在丙二酸二乙酯的α-芳基化中，富电子溴代芳烃显示较好的活性；Pd2/L1催化的乙酰乙酸乙酯α-芳基化时，以K2CO3为碱，催化体系显示较好的活性，这个催化体系可控制反应得到α-芳基乙酰乙酸乙酯，而不是脱乙酰基的产物。

The extracts from evening primrose flower could significantly enhance the cellular immune function in immunosuppressed mice. Effects of ethylacetate extract was better than those of water extract.

月见草花乙酸乙酯提取物和水提取物均可明显增强环磷酰胺免疫抑制小鼠的细胞免疫功能，其中乙酸乙酯提取物的作用优于水提取物。

According to the results of the former study in our laboratory, trans-1, 2-cyclohexanediol is produced with a lot of acids and water, for extraction of trans-1, 2-cyclohexanediol from the solution, ethyl acetate and butyl acetate were used as extraction reagents, the solubility data of the trans-1, 2-cyclohexanediol in corresponding mixed solvents of some sorts of acetates and water are needed.

根据本实验室前期研究结果可知，反式-1，2-环己二醇是在酸性和大量水存在的条件下得到的，为了把反式-1，2-环己二醇从反应液中萃取出来，本工艺所采用的萃取剂是乙酸乙酯和乙酸丁酯，需要获得反式-1，2-环己二醇在这些酯类与水混合溶剂中的溶解度数据，因而对反式-1，2-环己二醇进行相关固液相平衡的研究是非常迫切和必要的。

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。