酯

Results showed that the con- tent of phospholipids decreased from 23.3% to 11.2%,the content of free fatty acid increased from 1.6% to 11.5%,the content of glyceride had no significant change;SFA、MUFA and PUFA of glyceride and phos- pholipids had no significant change;in the free fatty acid,the content of PUFA significantly decreased,the content of MUFA were also decreased,but had no significant change,the content of SFA increased signifi- cantly.

结果表明：磷脂的含量从23.3%减少到11.2%，游离脂肪酸的含量从1.6%增加到11.5%，甘油酯的含量没有发生显著性变化；甘油酯和磷脂中的饱和脂肪酸、单不饱和脂肪酸、多不饱和脂肪酸都无显著性变化；游离脂肪酸中，PUFA的含量显著减少，MUFA的含量减少，但其变化不显著，SFA的含量显著增加。

The objective of this study was to produce high-purity(≥90%) Glycerol Monolaurate through synthesis and purification.

本论文研究月桂酸单甘酯的合成与提纯，目的是得到单甘酯含量90％以上的产品。

As a kind of widely used fine chemical,glyceryl triacetate was synthesized by esterification of glycerin with acetic acid.

以乙酸、甘油为原料，通过酯化反应合成乙酸甘油酯。

Tissue was homogenized with glyceryl triacetate, and then the homogenate was centrifuged for 5 min at 2000×g. The under layer of glyceryl triacetate was used for ESR detection.

组织通过用三乙酸甘油酯匀浆，匀浆液2000×g离心5 min，下层的三乙酸甘油酯用于ESR测定。

The Catalyst used for preparation of carbodiimide from condensation of isocyanate were reviewed in this paper, including phosphorus-containing heterocycle compounds, phosphonate,organic metal compounds and polymer-grafting solid catalysts.

综述了异氰酸酯缩合生成碳化二亚胺催化剂的开发现状，包括磷杂环化合物、磷酸酯类化合物、金属有机化合物、聚合物接枝固相催化剂4大类。

In this thesis, a series of derivatives of -Huperzine A and benzylpiperidine were designed and synthesized, including nonsteroidal anti-inflammatory drug derivatives, heterocycle derivatives, aromatic derivatives and its sckiff derivatives, etc.

全部目标化合物进行了胆碱酯酶的活性测试，石杉碱甲类衍生物的乙酰胆碱酯酶活性比母体差，说明该类取代基在胺基上取代可能会使石杉碱甲衍生物的活性降低。

Using Hexamethylenetetramine as the catalyst and P-Hydroxyanisole as the inhibitor, glycidyl methacrylate were prepared by two-step method successfully.

本论文以六次甲基四胺为催化剂，对羟基苯甲醚为阻聚剂，采用酯化闭环两步法制备出甲基丙烯酸缩水甘油酯。

Methods 4-Hydroxybenzonitrile (2) as the starting material was transformed to 4-hydroxy-thiobenzamide (3) via thioformylation. And ethyl 2-(4-hydroxyphenyl)-4-methylthiazole-5-carboxylate (4), which was synthesized via cyclization from 3, was treated with hexamethylenetetramine to generate the intermediate ethyl 2-(3-formyl-4-hydroxyphenyl)-4-methylthiazole-5-carboxylate (5). The target compound febuxostat (1) was obtained from 5 by etherification, cyanidation, hydrolysis.

以羟基苯腈为原料，经硫代甲酰化得到对羟基硫代苯甲酰胺(3)，3经环合得到2-（4-羟基苯基）－4-甲基－噻唑－5-羧酸乙酯(4)，4与乌洛托品反应，得到中间体2-（3-甲酰基－4-羟基苯基）－4-甲基－噻唑－5-羧酸乙酯(5)，之后再经醚化、氰化、水解得到目标产物(1)。

Moreover, the conversion and enantioselectivity in the ionic liquid were also higher than that in hexane.

试验结果表明，[PF6]中的酯化反应速率，酯化转化率和手性选择性都优于正己烷。

The influence factors such as molar ratio of hexyl alcohol to propionic acid,amount of catalyst, and reaction time on the yield of hexyl propionate were discussed.

以钨硅酸为催化剂，通过丙酸和己醇反应合成了丙酸己酯，探讨了醇酸物质的量比、催化剂用量及反应时间对酯化率的影响。

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。