新型过渡金属配合物的合成、表征及生物活性研究

为了寻找更好的生物活性化合物,以1-苯基-3-甲基-5-吡唑啉酮和苯甲酰氯为原料,二氧六环为溶剂,回流反应合成了4-酰基吡唑啉酮配体及4种过渡金属配合物,通过元素分析、红外光谱、差热-热重分析、紫外光谱等对其结构进行了表征,表明配合物组成分别为:Cu(L)2、Zn(L)2、Ni(L)2、Mn(L)2;同时利用抑菌圈大小...     

过渡金属配合物的合成、性质及生物活性研究

金属配合物药物在疾病的治疗中起着重要的作用,过渡金属钴的配合物在药物学、配位化学和生物无机化学学科具有重要的作用.钴是组装配位聚合物时常选用的金属元素,钴离子易与含氮、氧配位原子的配体形成配合物,能与羧基以多种配位方式组成不同类型的配合物.含羧基类配体是常用的有机配体,具有良好的柔韧性,通常能形成结构新颖的配合物.其分...     

烯效唑Fe(Ⅱ)配合物的合成、结构及生物活性研究

合成了新的配合物[FeL_4Cl_2](L=(E)-1-对氯苯基-2-(1,2,4-三唑-1-基)-4,4-二甲基-1-戊烯-3-醇,采用元素分析EA、红外光谱IR和X射线单晶衍射方法对配合物的组成及结构迚行表征。该配合物晶体属于三斜晶系,P-1空间群,晶胞参数如下:a=8.989 6(5)(?), b=13.0714(9)(?), c=14.717 5(12)(?),α=93.089(3)°,β=99.809(3)°,γ=104.408 (4)°, V=1 642.1(2)?~3,Dc=1.308 g?cm~(-3), F(000)=676。研究了配合物及烯效唑对苹果干腐Ⅰ、苹果轮纹Ⅱ、小麦赤霉Ⅲ和葡萄黑豆Ⅳ四种病菌的抑制活性。结果表明:配合物的抑菌活性优于配体。对于葡萄黑豆病菌Ⅳ,配合物毒力指数是配体的3.66倍。与配体相比,FeCl_2与烯效唑配位后可提高生物活性。     

稀土三元配合物的合成、表征及其生物活性研究

以氯化镧、席夫碱、邻菲啰啉为原料,制备了新型稀土镧三元配合物,通过元素分析、紫外光谱、红外光谱、透射电子显微镜等手段对其进行了表征,确定了三元配合物的化学组成为La(L)phen(NO3)3C2H5OH.CH3OH。抗菌实验结果表明,配合物对大肠杆菌和金黄色葡萄球菌的抑菌圈直径分别为26 mm和20 mm,最小抑菌浓度分别为60 mg/L和130 mg/L,具有较强的抑制作用,且对大肠杆菌的抑制效果较强。     

稀土联咪唑对羟基苯甲酸配合物的合成、表征及生物活性

以稀土氯化镧、联咪唑和对羟基苯甲酸为原料,制备了一种新型稀土三元配合物,通过元素分析、红外光谱、紫外光谱、XRD、TEM对其进行表征,确定了该配合物的化学组成为:La(Hbiim)3N(Hbiim=2,2’-联咪唑,N=对羟基苯甲酸)。抗菌实验结果显示,三元配合物抑菌圈直径为13～17 mm,说明配合物对大肠杆菌、金黄色葡萄球菌具有一定的抑制作用,且对金黄色葡萄球菌的抑制效果较好,抗菌谱广。     

稀土钐二元、三元配合物的合成、表征及其生物活性研究

以氯化钐、2-氨基嘧啶和钼酸钠为原料,制备了两种新型稀土钐二元、三元配合物,通过元素分析、紫外光谱、红外光谱等手段对其进行了表征,确定了二元配合物的化学组成为Sm2(AP)(H2O)2Cl3(AP=2-氨基嘧啶),三元配合物的化学组成为:Sm3(AP)(MoO4)2(CH3OH)4Cl5。抗菌结果表明,二元配合物对大肠杆菌和金黄色葡萄球菌的抑菌圈直径分别为13 mm和15 mm,三元配合物分别为13 mm和13 mm,两种配合物对大肠杆菌、金黄色葡萄球菌都有一定的抑制作用。采用MTT法对两种配合物诱导癌细胞凋亡能力做了初步研究,两种配合物的半数抑制浓度IC50在0.001~0.01 mg/mL之间,证明其具有诱导癌细胞凋亡的作用。     

吡啶鎓阳离子对镍配合物的合成及表征

合成了马来二氰基二硫烯镍(Ⅱ)配合物[1-NaPhthMePyNH_2]_2[Ni(mnt)_2]([1-NaPhthMePyNH_2]~+为1-(1′-奈苄基)-2-氨基吡啶鎓离子),并用元素分析,UV,IR,单晶X射线衍射表征了其组成和结构。结果表明:配合物系三斜晶系,空间群P_(-1),a=0.764 78(15)nm,b=0.949 88(19)nm,c=1.360 9(3)nm,α=92.491(2)°,β=103.784(2)°,γ=105.723(2)°,V=918.0(3),Z=1。     

Zn(Ⅱ)配合物合成及生物活性研究进展

综述了近年来Zn(Ⅱ)配合物的合成及生物活性研究,对发展前景作了展望。     

钌(Ⅱ) 杂环醛苯甲酰腙配合物的合成、表征及生物活性

以cis-[Ru(Ⅱ)Cl2(DMSO)4]和杂环醛苯甲酰腙为原料,合成2个[Ru(Ⅱ)Cl2(DMSO)2L1,2]型(L1为4-吡啶甲醛苯甲酰腙,L2为2-呋喃甲醛苯甲酰腙)配合物。通过元素分析、红外光谱、紫外光谱和核磁共振氢谱对配合物结构进行了表征,利用循环伏安法研究了配合物的电化学性质,并用打孔琼脂扩散法检测了配合物的抑菌效果。用MTT法测试了配合物对人肺癌细胞株A549的抑制活性,IC50值为195.79 mg/L。     

2,2’-联吡啶钐(Ⅲ)配合物的合成及生物活性研究

文章通过X-射线单晶衍射表征了一个2,2’-联吡啶钐稀土配合物[Sm(2,2’-bipy)2(NO3)3],紫外光谱、荧光光谱和粘度法的研究结果表明配合物与DNA的作用方式为插入模式。采用MTT法研究了配合物对人体癌细胞的增殖抑制作用,实验结果表明:在50μmol/L浓度下,该配合物对5种肿瘤细胞HeLa,NCI-H460,MCF-7,HL-60和HepG-2都表现出一定的活性。     

DNA Nanoarchitectures: Steps towards Biological Applications

DNA's remarkable molecular recognition properties, flexibility, and structural features make it one of the most promising scaffolds to design a variety of nanostructures. During recent decades, two major methods have been developed for the construction of DNA nanomaterials in a programmable way; both generate nanostructures in one, two, and three dimensions. The tile‐based assembly process is a useful tool to construct large and simple structures; the DNA origami method is suitable for the production of smaller, more sophisticated and well‐defined structures. Proteins, nanoparticles and other functional elements have been specifically positioned into designed patterns on these structures. They can also act as templates to study chemical reactions, help in the structural determination of proteins, and be used as platform for genomic and drug delivery applications. In this review we examine recent progresses towards the potential use of DNA nanostructures in molecular and cellular biology.     

Intracellular detection of cytosine incorporation in genomic DNA by using 5-ethynyl-2'-deoxycytidine

5-Ethynyl-2'-deoxycytidine triphosphate (EdCTP) was synthesized as a probe to be used in conjunction with fluorescent labeling to facilitate the analysis of the in vivo dynamics of DNA-centered processes (DNA replication, repair and cytosine demethylation). Kinetic analysis showed that EdCTP is accepted as a substrate by Klenow exo(-) and DNA polymerase β. Incorporation of 5-ethynyl-2'-deoxycytidine (EdC) into DNA by these enzymes is, at most, modestly less efficient than native dC. EdC-containing DNA was visualized by using a click reaction with a fluorescent azide, following polymerase incorporation and T4 DNA ligase mediated ligation. Subsequent experiments in mouse male germ cells and zygotes demonstrated that EdC is a specific and reliable reporter of DNA replication, in vivo.     

Polymerase Amplification,Cloning, and Gene Expression of Benzo‐Homologous “yDNA” Base Pairs

A widened DNA base‐pair architecture is studied in an effort to explore the possibility of whether new genetic system designs might possess some of the functions of natural DNA. In the “yDNA” system, pairs are homologated by addition of a benzene ring, which yields (in the present study) benzopyrimidines that are correctly paired with purines. Here we report initial tests of ability of the benzopyrimidines yT and yC to store and transfer biochemical and biological information in vitro and in bacterial cells. In vitro primer extension studies with two polymerases showed that the enzymes could insert the correct nucleotides opposite these yDNA bases, but with low selectivity. PCR amplifications with a thermostable polymerase resulted in correct pairings in 15–20 % of the cases, and more successfully when yT or yC were situated within the primers. Segments of DNA containing one or two yDNA bases were then ligated into a plasmid and tested for their ability to successfully lead the expression of an active protein in vivo. Although active at only a fraction of the activity of fully natural DNA, the unnatural bases encoded the correct codon bases in the majority of cases when singly substituted, and yielded functioning green fluorescent protein. Although the activities with native polymerases are modest with these large base pairs, this is the first example of encoding protein in vivo by an unnatural DNA base pair architecture.     

DNA光修复酶的功能及其在化妆品中的应用

本文介绍了紫外线对皮肤伤害的基本原理,对DNA光修复酶在抵抗紫外线损伤中的重要功效进行了综述,并介绍了其作为化妆品功能成分开发的现状,预测其作为基因修复型抗日晒产品的广阔应用前景。