查询词典 methanol

Then MAL is converted into methylacrylic acid through oxidation. At last, MAA is esterified to MMA with methanol.

日本旭化成公司以异丁烯为原料，得到MAL后直接氧化酯化的方法正在开发中。

The methods of expunging methanol from C5 with pervaporation membranes were studied in this paper.

对用渗透蒸发膜分离方法去除C5中的甲醇进行了研究。

The filtrates are combined and any remaining traces of the thioglycolic acid are washed out using 500 ml water and then 200 ml cold methanol.

合并滤液，将巯基乙酸中的残渣分别用500毫升的水和200毫升的冷甲醇进行洗涤。

Objective:To study the antioxidative effect of aqueous fraction of Boschniakia rossicaextracted with methanol and fractionated with dichloromethane and water.

中文摘要：目的：探讨草苁蓉甲醇提取后进一步分离的水层成分对二乙基亚硝胺所致肝脏癌前病变大鼠血清抗氧化活力的影响。

These work can be as the reference to this area in the future Pd/〓/〓、Pd/〓、〓、〓, under illumining of photo 〓 was reduced under the action of the catalysts into products, including methane acid、methanol and formaldehyde.

我们对几种催化剂进行了对比性研究，如Pd/〓、Pd/〓、〓，通过可见光的照射，使二氧化碳在催化剂的作用下进行还原，发现得到的产物均为甲酸、甲醇和甲醛。

According to the physiochemical properties of anthocyanin, methanol solution containing 0.1 mol/L HCl was selected as the extraction solution, then grape pomace lixiviated for 30～40 min with pH=3.0～4.0 and temperature at 60～70 ℃, and then the liquid or paste extract was prepared after a series of technical procedures including extraction, centrifugation, filtration and vacuum concentration.

本课题根据花色素苷的理化性质，选择了用0.1 mol/L 的HCl的甲醇溶液作提取剂，在pH值为3.0～4.0及60～70 ℃温度下浸提30～40 min，再经萃取、离心、过滤、减压浓缩，可得到液态或膏状提取物，并通过了分析检测；还对花色素苷在食品工业中的应用作了研究。

The optimum extraction conditions were summed up as follows through orthogonal test: 60 % methanol solution as solvent, lixiviating temperature at 60 ℃ and 40 min lixiviating time, the ratio of raw materials to liquid as 1∶40, and lixiviating twice.

正交试验表明，采用60 %甲醇溶液作为溶剂，最佳提取条件为浸提温度60 ℃，浸提时间40 min，料液比为1∶40，浸提2次。

The HPLC method has been used to investigate the stability of etimicin in 0.9% sodium chloride, 5% glucose, 10% glucose, compound sodium chloride, glucose sodium chloride and so on. In the experiment, the ODS-C18 column (4.6mm×250mm), mobile phase: methanol/water/acetic acid=80/16/4 (containing heptane sulfonic sodium 0.02mol/L), UV detection with wavelength of 330nm were employed. After integrating each of the menstruums with etimicin, the content and pH value were measured after 1h, 2h, 4h, 6h and 8h at a temperature of 17, 25 and 35℃, respectively.

实验采用HPLC法，以C18柱为色谱柱，CH3OH：H2O：HAc=80：16：4（含0.02mol/L庚烷磺酸钠）为流动相，检测波长330nm；对依替米星在生理盐水，5%葡萄糖，10%葡萄糖，复方氯化钠，葡萄糖氯化钠等溶媒中进行了稳定性研究，在室温(17℃)，25℃，35℃情况下，将依替米星与不同的溶媒配伍后，在1h，2h，4h，6h，8h分别测定它们的含量及pH值。

Formaldehyde, methanol and methane have been utilized as methylating agents.

甲烷、甲醇和甲醛可用作反应的甲基化试剂。

Methods by using a broad pH range column(Gemini NX C18,4.6mm×150mm,5μm),basic mobile phase which was[H_2O-ammonia-glacial acetic acid] (96:3.6:0.4)-methanol,the related substances in etimicinsulfate were separated and detected by electrospray ionization and positive ion monitoring,the ESI ion source condition was following: temperature is 350℃,nebulizing pressure is 50 psi,dry gas flow is 10 L /min.some related substances in etimicinsulfate were identified by comparing the retention time in chromatography,~+ spectrum and MS~2 spectrum with reference substances\',the others which haven\'t reference substances were identified or speculated by analyzing their MS~2 fragmentation with the help of a rule summarized from the MS~2 fragmentation of gentamicin C1a,micronomicin and etimicin.Results nineteen related substances in etimicinsulfate were separated and detected.

方法利用宽pH范围的Gemini NX C18(4.6mm×150mm，5μm)色谱柱，在碱性条件下，以[水-氨水-冰醋酸(96：3.6：0.4)]-甲醇(70：30)为流动相，直接分离各组分；并用HPLC-ESI-MS~2检测样品中各组分，质谱条件：ESI离子源，离子源温度350□，雾化室压力50 psi，干燥气流速10 L/min，正离子检测方式；对有对照品的有关物质采用比对有关物质与对照品的色谱保留时间、准分子离子的质荷比及二级质谱方法进行鉴定，无对照品的有关物质，则是先通过解析庆大霉素Cla、小诺霉素、依替米星的二级质谱，对该类化合物的二级质谱裂解规律进行归纳，并以此推测未知新化合物进行结构，再用推测的结构对二级质谱进行解析，如所有的碎片离子均合理解释，表明推测合理。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。