Seperation and identification of trans-xanthophylls and cis isomers in corn gluten meal;
玉米蛋白粉中反式叶黄素及主要顺式异构体的分离鉴定
4-Isopropylbenzoic acid was hydrogenated to give a mixture of cis-and trans-4-isopropyl-cyclohexanecarboxylic acid (76∶24),the mixture was transformed into the acylchoride with PCl5 ,and then condensed with D-phenylalaine,after recrystallization from acetonitrile,nateglinide cis-isomer was obtained which may be served as the reference in the quality control of nateglinide.
4-异丙基苯甲酸经氢化还原得4-异丙基环己基甲酸的顺式和反式(76∶24)混合物,不分离制成酰氯后,与D-苯丙氨酸缩合,得那格列奈及其顺式异构体混合物,经乙腈重结晶得那格列奈顺式异构体,可作为那格列奈质量控制的参照物。
Peptidyl-prolyl cis/trans isomerization is of considerable biological significance and prolyl residue plays an important role in the final structure of proteins.
25nm,同一性(identity)<30％的2401条肽链中计算提取了全部顺式与反式脯氨酸肽键的位置,数目分别为1221个与26401个,从而建立了一个较大规模的脯氨酸肽键数据集。
A Study on Preparation of Cis-pinane in Pinene Hydrogenation;
蒎烯催化加氢制备顺式蒎烷
Study on Synthesis of cis-Pinane by Catalytic Hydrogenation of α-Pinene;
α-蒎烯催化加氢制备顺式蒎烷的研究
Nanometer nickel was first used in hydrogenation of α-pinene: the conversion rate of raw material with nanometer nickel as catalyst was higher than that of Raney nickel and the selectivity of cis-pinane was higher than that with Pd/C.
将纳米镍催化剂首次应用于α-蒎烯的氢化反应中,与其他催化剂相比,本实验条件下原料转化率高于骨架镍,产物顺式蒎烷选择性高于Pd/C。