酯

The hemisuccination process and kinetics ofβ-sitosterol and stigmasterol with succinic anhydride were studied, respectively.

为植物甾醇琥珀酸酯化反应过程和植物甾醇琥珀酸酯化产物的分离与精制过程的工业化提供理论指导和技术参数。

Condensation condition was studied for lipase-catalyzed synthesis of β-sitosterol ester with conjugated linoleic acid in organic solvent.

采用高效酰化催化法和酰氯化法分别合成了燕尾型胆甾醇酯和对称脂肪族二羧酸胆甾醇酯两类衍生物样品。

The invention also relates to the use of the said aliphatic ester of an ester and of the said oil having a molar mass ranging from 650 to 10000 g/mol, in a physiologically acceptable composition, as agent for conferring on the said composition properties of slipperiness, of nonstickiness, of gloss and/or of comfort.

本发明还涉及所述酯的脂族酯和所述的摩尔质量为650至10000g/mol的油在生理适用的组合物中的用途，它们用作令所述组合物具有光滑性、不粘腻、亮泽和/或舒适特性的成分。

Ethyl dicyanopropionate was synthesized by one-step reaction with sodium cyanide, paraformaldehyde and ethyl cyanoacetate in solvent.

由氰化钠、多聚甲醛和氰乙酸乙酯在溶剂中反应，一步合成二氰基丙酸乙酯，收率达80.2%，含量90.8

With ammonium persulfate/sodium thiosulfate as Redox initiator system,a binder based on vinyl acetate/acrylate copolymer used for chopped strand mat was prepared at low temperature.

以过硫酸铵/硫代硫酸钠为氧化还原引发体系，在低温下研究制备出了短切毡用的醋酸乙烯酯与丙烯酸酯类共聚物粘结剂。

Calcium carbonate and soluble glass and so on were confected as alkaline antifouling agent. The Infrared Spectrometry results showed that 2275-2250 cm~(-1) diagnostic absorb wave crest in part A and 3390-3200 cm~(-1) in part B and 1730 cm~(-1) in coating film strongly proved polymers reacted just as the reacting mechanism, that means polysiloxane which offer low-surface-energy property linked Polyurethane system by —OH groups reacting with —NCO groups. Relative molar mass of part A and part B was determined by Gel Permeation Chromatography and the results were appropriate. Surface-energy was determined and results were between 33.6-47.17 mN/m and it increased when alkaline antifouling agent was put into the coating. Alkaline antifouling agent was releasing steadily when the coating film was dipped in seawater. As time gone, the pH value of seawater was increasing. Solubility parameter and results showed that there was no corrasive phenomenon between the polyethylene strand and the coating.

红外光谱分析结果表明，出现在A组分中的2275～2250cm~(-1)处的异氰酸酯特征吸收峰、B组分中的3390～3200cm~(-1)处硅羟基的特征吸收峰及出现在固化后涂膜中的1730cm~(-1)处氨基甲酸酯基团的特征吸收峰证明了涂料成膜物质交联固化符合本文的设计要求，即赋予涂膜低表面能特性的有机硅组分通过—OH基团与—NCO基团的反应已经链接到聚氨酯体系中；凝胶渗透色谱结果表明，成膜物质的A、B组分均为低分子量，符合预聚物的要求；涂膜表面能的测算结果表明，涂膜的表面能在33.6～47.17mN／m之间；加入碱式防污剂后涂膜的表面能略有升高；碱式防污剂的释放平稳，随着涂膜在海水中浸泡时间的增长，pH值有增加的趋势；用溶解度参数原则来评价涂料与网绳的涂装，结果表明，本试验研制的防污涂料对聚乙烯网绳无溶蚀作用。

Methods: Lecithin and the sucrose ester-phospholipids liposome were prepared using the ethyl ether injection method by mixing sucrose ester with lecithin, sphingomyelin and cholesterol according to different lipids ratio.

按不同比例将乙酸异丁酸蔗糖酯与卵磷脂、鞘磷脂和胆固醇混合，溶于乙醚中，然后注入pH7.2的PBS缓冲液中，制成卵磷脂脂质体及蔗糖酯－卵磷脂脂质体。

During these years (1997-2000) in the research area of annonaceous acetogenins 5 natural products and a number of chiral-pure analogs of annonaceous acetogenins have been synthesized using sugars as the starting materials. Their high activity and selectivity against cell line of colon tumor and a relationship between activity and configuration have been found too. In the respect of inhibitor of sialidase two new methodologies for the synthesis of chiral-pure 3-deoxy-ulosonic acid using hetero-Diels-Alder reaction or asymmetric propargylation as the key reaction were developed. On the topic of anti-leukemia marine natural product clavulactone a synthetic method based on the free radical cyclization and starting from sugar has been developed. In other title of PKC inhibited agent sphingosine a new synthetic route with SN2' as the key reaction has also been disclosed.

项目期间（1997-2000）在番荔枝内酯方面从糖出发合成了五个天然产物和一批手性纯的类似物，它们对肠癌细胞有很高的活性和选择性，并与构型有关；在唾液酸酶抑制剂方面发展了二类全新手性纯高碳糖的合成方法－杂原子D－A反应或丙炔基不对称加成为关键的反应；抗白血病海洋天然产物群柱虫内酯方面研究了由糖出发和自由基环化反应的合成方法；对PKC 起抑制作用的鞘氨醇方面也开创了新的合成途径－由糖出发并以SN2'反应为关键反应。

Polydimethyl siloxane, polydimethyl siloxane, sodium acrylate/sodium acryloyldimethyl taurate copolymer, isocetane, sorbitan ester-80, PCA sodium, ethanol, menthyl lactate, spicery, Contain Bulgaria wild rose pistil extract with tendering formula, moisturize and nourish skin, strengthen the firmness and toughness of eye skin, and recover eye skin to moist, firm, tender and bright state.

环聚二甲基硅氧烷、聚二甲基硅氧烷、丙烯酸钠/丙烯酰二甲基牛磺酸钠共聚物、异十六烷，聚山梨醇酯-80、PCA 钠、乙醇、薄荷醇乳酸酯、香精、蕴含自保加利亚野生玫瑰精华成份调和而成的嫩肤配方，保湿滋养，增强眼部弹性及韧性，回复眼部肌肤柔润、富有弹性，令眼部肌肤幼滑紧致、水嫩柔润、神采明亮。

Enzymatic interesterification of palm stearin and soybean oil was carried out by immobilized lipase Lipozyme TL IM. The reaction curve of batch operation was studied. Results showed that the reaction reached blance in 3 h with 5% lipase at 70℃, temperature of 70~90℃ did no remarkable influence on the reaction rate.

进行了固定化脂肪酶Lipozyme TL IM催化棕榈油硬脂和大豆油酶法酯交换的研究，考察了酶法酯交换分批操作的反应动力学曲线，发现5%的加酶量、70℃下反应，反应3 h内达到平衡，反应温度在70~90℃对反应速度无明显影响。

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。