顺式异构体

其中，反式异构体生理活性强于顺式异构体，单体的活性大于糖苷。

Among them , the physiologically active of trans-isomer is stronger than the cis-isomer , the monomer activity greater than the glucoside .

结果：（1）番茄红素高压处理（300MPa，8min，10℃）后总量变为原来的56.3%，顺式异构体比例从0.3%提高到10.05%。

Results : ( 1 ) Total lycopene content decreased to 56.3 % after HPP ( 300 MPa , 8 min , 10 ℃), however , the cis-isomer ratio increased from 0.3 % to 10.05 % .

HPLC法测定盐酸曲马多中的顺式异构体

Determination of isomers in tramadol by HPLC

结果以高收率获得了目标化合物，发现反式异构体ZX-5能促进细胞NO的释放，选择性增加脉络膜血流，而顺式异构体ZX-4无此药理作用。

RESULTS The target compounds were prepared in high yields . Trans isomer ZX-5 released significant amount of NO and specifically increased the choroidal blood flow , while cis isomer ZX-4 did not show these activities .

在紫外光照射下反式白藜芦醇能够转化为顺式异构体。

Trans-resveratrol under UV irradiation can be transformed into the cis-isomer .

在光稳定态，顺式异构体的量约为92%。

At the photostationary state the quantities of cis isomers are about 92 % .

在喷雾干燥过程中，约有1.1%的番茄红素发生了降解，2.1%的番茄红素变成了顺式异构体。

Another 1.1 % and 2.1 % of lycopene degraded and isomerized respectively as result of spray-drying .

结论反式异构体淬灭羟自由基的能力比顺式异构体强。

CONCLUSION This observation also suggests that E-isomer has a stronger ability to quench radical than Z-isomer did .

实验证实，高纯度全反式番茄红素在光照和接触空气后，极易转变为13-或9-顺式异构体和氧化产物；

The high purity all-trans lycopene was very easily converted into 13-or 9-cis-lycopene and oxidated products under the condition of the sunlight and the air .

测得白藜芦醇苷和苷元及其顺式异构体的甲醇水溶液的最大紫外吸收波长分别为305/285nm和319/291nm。

The maximum UV absorption wavelengths of methanol solution of RES , piceid and each cis-isomer were 305 / 285 nm and 319 / 291nm , respectively .

醋炔诺酮肟顺、反式异构体的分离、鉴别与其抗生育活性的比较

Studies on the separation and identification of anti-and syn-isomers of norethisterone acetate oxime and comparison of their antifertility activity

在烯烃的顺式与反式异构体中，处于碳碳双键两端的顶点间的距离是不同的。

The distances among the vertices spaced by the double bond are different in the cis-alkenes from those in its trans-isomers .

路线二和路线三中用苯甲酯保护活泼羟基，并可以分离顺式和反式异构体。

In the second route and third route , the insertion of benzoylation can effectively protect the active methylol radical and may advantageously be employed to facilitate the separation of cis - and trans-forms of the intermediate .

并结合尿素与硫脲的催化反应过程，讨论了氢键复合物两种可能的顺反异构并分析比较了顺反式构象的异构体之间的稳定性大小。

Two possible hydrogen bonding complexes conformations , cis and trans , were discussed and the energy gaps between them were analyzed , in combination with the catalytic reactions .