查询词典 synthesis method

A new method for synthesis of rosolic acid is introduced in this thesis: under solvent-free conditions, grinding the mixture containing phenol, oxalic acid and copper salt catalyst and then irradiated by MW to produce rosolic acid .

本文主要介绍了一种新的制取玫红酸的方法：在无溶剂的条件下，通过研磨将苯酚，草酸和催化剂混合均匀，再由微波作用，直接合成玫红酸。

The Perkin method for coumarin synthesis from salicylaldehyde and acetic anhydride has been improved by using calcium acetate as catalyst and polyethylene glycol as activator.

对以水杨醛和乙酸酐为原料合成香豆素的工艺进行了改进。采用乙酸钙为催化剂、PEG为活化剂的工艺路线。

The Perkin method for coumarin synthesis from salicylaldehyde and acetic anhydri de has been improved by using calcium acetate as catalyst and polyethylene glycol as activator.

摘 要 对以水杨醛和乙酸酐为原料合成香豆素的工艺进行了改进。采用乙酸钙为催化剂、PEG为活化剂的工艺路线。

A series of SiW_(12)/AC catalysts with different silicotungstic acid loadings supported on acti- vated carbon which was treated with 10% HNO_3 solution were prepared by an impregnation method and the catalytic performance of SiW_(12)/AC for the synthesis of trioxane were investigated.

以10%硝酸溶液处理过的活性炭为载体，采用不同质量分数的硅钨酸SiW_(12溶液为浸渍液，制备了不同负载量的SiW_(12)/AC催化剂，考察了催化剂在合成三聚甲醛中的催化性能，并用XRD、FT-IR、NH_3- TPD、BET、TG-DSC等手段对SiW_(12)/AC催化剂晶粒大小、催化剂表面的酸量及酸强度、比表面积及热稳定性等微观特性进行了表征。

The composite amino acids of pupa protein was prepared by the method of enzymatic-acid hydrolysis. N-stearyl composite amino acids is synthesized by the synthesis reaction of stearyl chloride reacting with composite amino acids.

以蚕蛹为原料，采用酶－酸两步水解法制备混合氨基酸液，再与硬脂酰氯反应合成N-硬脂酰基复合氨基酸表面活性剂。

Solid superacid catalyst was prepared by sol-gel method; its catalytic activity was investigated to synthesis of n-butyl acetate.

采用溶胶-凝胶法制备了固体超强酸催化剂，考察它们在酯化反应中的催化活性。

Roseus alkaloid being detected out with the method of thin layer chromatography, which indicated that the isolated endophytic fungus could not directly synthetize C. roseus alkaloid, but they possible had promotion on the synthesis of C.

表明分离出的内生真菌本身不能直接合成长春花生物碱，而可能对生物碱的合成起促进作用。

The studies was proceeded on the the supercritical CO2 extraction technique of rotenone from Tephrosia vogelii. The extraction influences of technology conditions were systematically groped, The research results were listed as follows:1 The analysis method applied in this paper has been proved to be suitable to technology research of the studies on the SC-CO: extraction technique of rotenone from Tephrosia vogelii. 3 indexes, extraction ratio of rotenone. extraction ratio of total compounds and rotenone content percent in total compounds weight, were carried out with HPLC quantitatively determination combined with the sample weight loss after extraction. With these 3 indexes. The extraction influences of technology conditions were evaluated by synthesis. Then the best technology conditions were ascertained for different extraction aims.2 The pretreatment of rough material should be needed before extraction. Comminuting the material to 0.28mm size is most fit to SC-CO: extraction.3 Firstly static extracting 20 min then turn to dynamic doing is the better extraction mode than other ones.4 The orthogonal experiment was conduct with 3 factors and 5 levers.

本论文通过对非洲山毛豆SC-CO_2萃取中影响萃取效果的工艺条件的研究，初步得出如下结果：(1)本论文中所采用的萃取效果评价方法适宜于非洲山毛豆中鱼藤酮的超临界流体萃取技术研究，该方法具体为：HPLC定量分析非洲山毛豆SC-CO_2萃取物中的鱼藤酮含量，再结合萃取前后处理样品的重量损失，得出鱼藤酮萃取率、萃取所得粗物质萃取率和粗物质中鱼藤酮含量三个参数，以此三个指标综合评价萃取条件对萃取效果的影响；(2)通过对原料粒度对萃取效果影响的研究，结果表明SC-CO_2萃取非洲山毛豆复叶中的鱼藤酮，原料粉碎成30目粒度叶粉时萃取效果较好；(3)通过对萃取方式与萃取效果之间关系的研究，结果表明SC-CO_2萃取非洲山毛豆中鱼藤酮应采用先静态后动态的萃取方式，静态萃取时间为20min；(4)通过温度、压力和CO_2流量三因素五水平的正交试验，结果表明温度是最主要的影响因素，压力因素对鱼藤酮萃取率的影响程度高于CO_2流量，而对于粗物质萃取率和粗物质中鱼藤酮含量CO_2流量因素高于压力。

A theoretical study of the surface structure of silica-supported zirconium sulfate tetrahydrate with high catalytic activity for synthesis of 2-ethoxyethyl acetate has been investigated using the ASED-MO method (including atomic repellent energy).

采用量子化学ASED-MO(含原子对排斥的EHMO法)为基础的结构自动优化EHTOPT法研究了硅胶负载型硫酸锆表面相的结构特征。

In this article,the tripeptide RGD is synthesized by the method of liquid synthesis .

采用液相合成法合成了RGD 三肽并对其进行了生物活性检测，证实用液相合成的 RGD 短肽具有促进材料与内皮细胞粘附的生物活性。

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。