Ru(phen)2dppx2+-SDBS-DNA体系共振瑞利散射光谱及其分析应用研究

在水溶液中,带正电荷的Ru(phen)2dppx2+在阴离子表面活性剂十二烷基苯磺酸钠(SDBS)的表面聚集后,产生很强的共振瑞利散射.由于Ru(phen)2dppx2+与DNA之间有较大的结合常数(KB≥106 L·5mol-1),DNA的加入会使体系中"光开关"与SDBS分离,散射光强度大大降低,且体系散射光的降低程度与DNA的浓度呈线性关系.据此建立了DNA的定量测定新方法.     

Study on Triplex DNA by Use of Molecular “hight Switch”Complex of Ru(phen)_2(dppx)~(2+)

StudiesonthestructuraldiversityofDNAhavedrawnmuchattentioninrecentyears.Felsenfeldetal.1firstproposedthestructureoftriple-helixRNAandsuccessfullysynthesizedakindoftriplexRNA.Mirkinandcoworkers2discoveredatriplexDNA(H-DNA)inanacidsolutionofplasmid.Inthesameyear,Dervanetal.3attachedaman-madesingle-strandedDNAtorealgeneDNAandlocallyformedakindofinterstrandtriplex.ThiscouldbeusedtoinciseduplexDNAinaprecisemanner,showinghighpotentialforapplicationsasagenecontroller,man-maderestrictionend…     

DNA对Ru(bpy)_2(dppx)~(2+)-SDS体系共振光散射的猝灭作用及其应用

研究了Ru(bpy)2(dppx)2+-SDS-DNA(bpy=2,2′-联吡啶,dppx=7,8-二甲基-吡啶并[3,2-a:2′,3′-c]吩嗪)体系的共振光散射光谱。结果表明,在阴离子表面活性剂十二烷基硫酸钠(SDS)预胶束聚集体存在下,Ru(bpy)2(dppx)2+-SDS体系具有很强的共振光散射,DNA的加入使其共振散射光猝灭。探讨了反应机理。基于DNA对Ru(bpy)2(dppx)2+-SDS体系共振光散射的猝灭作用,建立了共振光散射法测定DNA的新方法。在最佳实验条件下,体系在393nm处的共振光散射猝灭程度与DNA的浓度呈线性关系,线性范围为0.01～1.2mg/L,检出限为1.5μg/L。     

Ru(bipy)2+3/Ru(phen)2+3-C2O2-4-CeⅣ化学发光反应动力学模型的研究

根据Ru(bipy)2+3/Ru(phen)2+3-C2O2-4-CeⅣ(bipy=2,2′-联吡啶,phen=1,10-邻菲咯啉)化学发光反应建立了该化学发光反应的动力学模型,根据模型计算出该反应的发光强度-反应时间曲线上升及下降阶段的反应速率常数、发光强度最大值及其出现的时间等.发光强度最大值及发光强度-反应时间曲线下的面积均可用于定量分析.     

Fe(phen)32+与DNA作用的荧光光度法研究

为了考察金属配合物Fe(phen)32+与DNA 的作用模式, 应用荧光光度法对Fe(phen)32+与DNA及DNA-EB的作用进行了研究,结果表明Fe(phen)32+是主要以共轭平面插入形式与DNA作用的, 并计算出稳定常数等一系列热力学数据.     

Ru(bipy)_3~(2 )/Ru(phen)_3~(2 )-C_2O_4~(2-)-Ce~(IV)化学发光反应动力学模型的研究

根据Ru(bipy)_3~(2 )/Ru(phen)_3~(2 )-C_2O_4~(2-)-Ce~Ⅳ(bipy=2,2＇-联吡啶,phen=1,10-邻菲咯琳)化学发光反应建立了该化学发光反应的动力学模型,根据模型计算出该反应的发光强度-反应时间曲线上升及下降阶段的反应速率常数、发光强度最大值及其出现的时间等.发光强度最大值及发光强度-反应时间曲线下的面积均可用于定量分析.     

Ru(phen)2dppx2+光谱探针法研究道诺霉素与脱氧核糖核酸的相互作用

以核酸分子“光开关”Ru(phen)2dppx2 为探针,分别采用紫外-可见吸收光谱法和荧光光谱法研究了抗癌药物道诺霉素(daunomycin,DNM)与小牛胸腺DNA之间的作用方式,结果表明:DNM是以插入的方式与DNA相互作用。Scatchard方程的研究表明,Ru(phen)2dppx2 与小牛胸腺DNA的结合比为1∶4~1∶5;表观结合常数为2.58×107L/mol。DNM加入后,表观结合常数大大降低,这也表明道诺霉素主要是以插入方式与DNA结合。作为研究核酸分子的荧光探针,与溴化乙锭相比,Ru(phen)2dppx2 具有灵敏度高、毒性低、稳定性好、选择性好、使用方便等优点。     

Ru(bipy)_2(dppz)~(2+)与DNA相互作用的光谱研究

利用荧光和紫外可见吸收光谱研究了 Ru( bipy) 2 ( dppz) 2 +与 DNA之间的插入键合作用。结果表明 ,Ru( bipy) 2 ( dppz) 2 +是通过 dppz配体插入到 DNA的双螺旋结构中。而且 ,一定浓度的 Fe( CN) 4 - 6 和 Na Cl对 Ru( bipy) 2 ( dppz) 2 +- DNA复合物的荧光无猝灭作用 ,这一结果也证实了 Ru( bipy) 2 ( dppz) 2 +和 DNA之间的插入键合作用     

席夫碱荧光探针用于水体系中Cu2+的高选择性测定

以8-羟基久洛尼定-9-甲醛和4-苯基氨基硫脲为原料合成了一种新的Schiff碱荧光探针(L)。在乙腈-水(1∶1,v/v,HEPES,pH=7. 4)缓冲溶液中,L与Cu~(2+)以1∶1和1∶2两种比例结合,溶液颜色由黄色变为棕黄色,荧光发生猝灭,体系的荧光强度和Cu~(2+)浓度在0～13μM的范围内呈线性关系,由此可以实现水体系中对Cu~(2+)的高选择性定量检测,检测限为6. 7×10~(-8)M。     

生物应用锌(Ⅱ)荧光探针研究进展

本文对近年来生物应用锌(Ⅱ)荧光探针研究进展进行了较详细地评述,并对其化学规律、性质和某些局限性进行了讨论。     

Study on Triplex DNA by Use of Molecular “Light Switch“ Complex of Ru(phen)2(dppx)^2

A new method for the study of triplex DNA is established according the fluorescence enhancement of molecular “Light Switch“ complex of Ru(phen)2(dppx)^2 when it intercalate into triplex DNA.Because the fluorescence intensity of Ru(phen)2(dppx)^2 bonded to triplex DNA is in ths case higher than that bonded to duplex DNA in certain range of DNA concentration,the method is much more sensitive than other methods reported previously.     

Synthesis, electrochemistry and fluorescence of four new Ru(phen)_3~(2 ) derivatives

Four typical LB monolayer film materials, Ru(phen)32 complexes with one ligand attached to different long chain alkyl amides, were designed and synthesized. Their chemical structures were identified by the techniques of FT-IR, 1H NMR and ESI-MS. Also, UV-Vis, electrochemistry and fluorescence of these complexes are reported.     

Synthesis, Electrochemistry, and Fluorescence of Two Ru(phen)_3~(2 )-based Surfactants

In1988.ZhangandBard'firstobservedtheelectrochemilurninescence(ECL)fromamonomolecularorganizedassemblylayerofaRu(bpy),= -basedsurfactantconfinedtothesurfaceofasolidelectrodebytheLangmuir-Blodgettmethod.Subsequently,theirgroup=furtherstudiedthiskindofmonolayermembranebythetechniqueofECLphotography.Zhaoetal.'havefoundECLefficiencyofRu(phen),",wherephenisl,10-phennanthroline,ismuchhigherthanthatofRu(bpy),' .InordertodevelophighefficientlyECLdevices,wedesignedandsynthesizedtwonewRu(phen),= …     

Synthesis, Electrochemistry, Fluorescence and ECL of Ru (phen)_2 (dcbpy) (PF_6)_2

HighlyluminescentRu(II).Os(II)andRe(l)metalcomplexesareapromisingclassofelectrochemiluminescent(ECL)materials'.WehavedesignedandsynthesizedRu(phen)=(dcbpy)(PF,)=Thesyntheticrouteisshownasfollows,4,4-dicarboxylicacid-2,2-bipyridine(dcbpy)wassynthesize...     

Synthesis and Properties of Ru(phen)_2(phen-NHCOCH_2Br)(PF_6)_2

Recently.anelectrochemiluminescent(ECL)Ptelectrodecoated\vithaRtl(bp})::derivativemoditiedchitosan/silicagelnlelllbralledevelopedbyZhaoalu/'.hasbeedsuccesstlill}appliedinselectivedetectionofoxalicacid.Yangel'I/.-.havediscoveredthatECLetficiencyofRu(phen),='ismuchhigherthanthatofRu(bp}i);=.Thus.wedesignedandsynthesizedanewactivematerialforECLsensor*Ru(phen)=(phenNHCH,Br)(PF,)=.andthesyntheticrouteisshowninFigure1.Figure1.SchemeI\)rs}nthcticrouteofRu(phcn)2(phCll-NIICIl:Br)(I'I:,)2…     

基于HRP直接标记的流感病毒H1N1电化学免疫传感器

构建了一种新型、灵敏、便捷式流感病毒免疫传感器,通过在金电极表面键合抗-HA单克隆抗体,选择性捕获目标H1N1流感病毒。该方法基于吸附在病毒表面的辣根过氧化物酶(HRP)在亚甲基蓝(MB)溶液中可有效催化还原H2O2,利用方波伏安法(SWV)考察了还原峰电流的变化,从而实现了对抗原病毒的特异性识别。实验表明所构建的免疫传感器对H2O2-MB体系表现出快速的电流响应以及良好的稳定性,对流感病毒H1N1检测的动态响应范围为0.01~2.0μg/m L,检出限(S/N=3)为5.0 ng/m L。结果证明HRP可作为一种简单快速的探针用于流感病毒的实时监测。     

Voltammetric Detection of a Specific DNA Sequence of Avian Influenza Virus H5N1 Using HS‐ssDNA Probe Deposited onto Gold Electrode

The working principle of a genosensor is based on the mechanism of ion‐channel mimetic sensors. The analytical signals generated upon hybridization processes were recorded by a redox active marker [Fe(CN)₆]^3?/4? present in the sample solution using voltammetric techniques. The developed genosensor was suitable for determination of 20‐mer complementary oligonucleotide sequence, and also of the PCR products containing the complementary 20‐mer sequence in various positions, with detection limits in the 10 pM range. The noncomplementary 20‐mer oligonucleotide sequence as well as the PCR product without complementary region generated very weak response. The good discrimination of the position of the complementary part in the PCR products was observed.