一种糖生物传感芯片制备的新方法

建立了一种用于SPR生物传感器分析的糖生物传感芯片制备新方法。在已二胺大量过量的情况下，海洋硫酸多糖911还原末端的半缩醛基与已二胺的一个氨基进行还原胺化反应，引入一个伯氨基，该伯氨基进一步与sulfo-NHS-biotin反应，使911的还原末端生物素化，通过预偶联到GM5芯片上的链酶抗生素抗体，以俘获法将生物素化的911固定到芯片表面。该方法避免已有固定方法对糖内部结构的破坏，减少了非特异性耦联，能更好地反映糖类与其它分子的相互作用特性，且操作简单，适应于多数具有还原末端的糖类。911经该方法固定后，利用SPR生物传感器，研究了其与HIV gp120蛋白V3区的相互作用动力学，初步证明两者之间存在强烈的相互作用，KA与KD分别为：2.25e5与4.44e-6。     

3-(3-吡啶基)-4-氨基-5-芳胺基-1,2,4-三唑的合成与表征

以烟酸与芳胺为基本原料，经多步反应，制得1－烟酰基－4－芳基氨基硫脲；后者在水合肼存在下关环，合成了一系列新化合物3－（3－吡啶基）－4－氨基－5－芳胺基－1，2，4－三唑。化合物结构经元素分析、IR，^1H NMR,^13C NMR确证。     

加兰他敏重要中间体溴那维定的合成

以6-溴异香草醛和酪胺为原料,经一锅法进行连续的两步还原胺化制得N-甲基-N-(4-羟基苯乙基)-2-溴-5-羟基-4-甲氧基苯甲胺(4),收率85%。以5%聚乙二醇为相转移催化剂,氯仿为溶剂,铁氰化钾为氧化剂,对4进行氧化偶联,合成了加兰他敏的重要中间体溴那维定,收率39%,其结构经1H NMR,IR和MS确证。     

FITC标记的叶酸类衍生物的合成及显像研究

本文的目的是研究荧光素FITC标记的叶酸衍生物的肿瘤靶向性。以对氨基苯乙酸为起始原料,合成了N-(2-氨基乙基)-2-(4-氨基苯基)乙酰胺。以DMAP、EDCI作缩合剂,将N-(2-氨基乙基)-2-(4-氨基苯基)乙酰胺偶联至叶酸的α位和γ位羧基,得到叶酸衍生物FA-EA,用荧光素FITC标记FA-EA得到FA-EA-(FITC)2。反应中间体及最终产物用HPLC、1H NMR和MS表征。通过尾静脉注射FA-EA-(FITC)2,观察其在荷瘤裸鼠主要脏器和肿瘤的分布及对荷瘤裸鼠进行活体荧光显像研究。实验结果表明,FA-EA-(FITC)2在肿瘤部位有明显的聚集,在其他主要脏器几乎看不到其分布,说明FA-EA-(FITC)2具有较好的肿瘤靶向性。本研究为进一步研制可用于肿瘤显像的叶酸类显像药物提供了依据。     

4-戊基(4′-丙基环己基)三联苯液晶的合成

在相转移催化剂十六烷基三甲基溴化铵的助催化作用下,用PdCl2催化芳基硼酸与溴代芳烃偶联反应合成了液晶化合物4－戊基（4′－丙基环己基）三联苯,反应转化率达到93％,反式产物选择性86％。结构经IR,^1H NMR和MS确证,并用DSC测定了此液晶的相变数据。考察了加料顺序和相转移催化剂对偶联反应的影响。提出了相转移条件下可能的催化循环机理,认为芳基硼酸是以ArB(OH)3^-离子形式参与偶联反应的。     

一种新型红色荧光卟啉的合成、表征及光谱性质

对－N，N－二苯氨基苯甲醛与吡咯在丙酸中回流直流缩合得到了一种新化合物四（N，N二苯基对氨基）苯基卟啉（TDPAPPH2）。通过元素分析，^1H NMR，IR和UV－Vis表征了其结构，该化合物能在红光区发射荧光。与无取代的四苯基卟啉（TPPH2）和相应的四氨基卟啉（TAPPH2）比较发现，其紫外光谱和荧光光谱具有较大的吸收红移。结合该化合物的结构特点用分子轨道理论对这种光谱红移现象进行了探讨。     

氨哮素的合成方法研究

研究了以对氨基苯乙酮为原料,高分子Lewis酸PVC－FeCl3为氯代反应催化剂,溴化铜为溴代剂,经苯环氯代、α-氢溴代、叔丁胺胺化缩合,最后用KBH4还原得氨哮素,产品总收率达40.8％。其结构经元素分析。IR,^1H NMR表征。     

含萘磺酰基大环多胺与Cu（Ⅱ）和DNA作用的荧光性能研究

以1,4,7,10-四氮杂环十二烷（Cyclen）为原料,合成了含有萘磺酰基的大环多胺,其结构经^1H NMR、MS、元素分析等表征。用荧光光谱法测定了大环多胺与Cu（Ⅱ）在不同pH下的配位情况,研究了大环多胺激发和发射波长,配体浓度与吸光度的线性关系;Cu（Ⅱ）、小牛胸腺嘧啶DNA对大环多胺荧光性能的影响。     

有机高价碘盐参与的炔丙醇的交叉偶联反应

有机高价碘在钯（Ⅱ）／铜（Ⅰ）共催化作用下与炔丙醇发生交叉偶联反应生成3－取代炔丙醇。该反应不仅条件温和，产率很高，而且具有良好的区域选择性。所得产物均经熔点，IR及^1H NMR验证。     

美金刚胺衍生物的合成

以盐酸美金刚胺为原料,分别与对硝基苯甲酰氯,苄氧羰基缬氨酸经酰基化反应和催化加氢反应,合成了两个新型的美金刚胺衍生物——N-对氨基苯甲酰基美金刚胺和缬氨酰基美金刚胺,其结构经1H NMR和IR表征。     

四铁取代的夹心型钨砷酸盐的合成及玻碳电极表面多层膜组装与电催化性质研究

碳电极表面的修饰在电化学和材料科学中很重要 .最近 ,通过层与层电子间的相互作用来自组装修饰玻碳电极已引起人们的关注 [1] .运用这种方法可将一些功能团修饰到电极表面 ,赋予电极一些新的功能 [2 ] .过渡金属取代的多金属氧酸盐不仅在配位环境 ,而且在催化活性方面都类似于金属卟啉和其它大环配体金属配合物 [3] .将其修饰到玻碳电极表面已有文献报道 [4 ] .由于修饰电极的厚度可控、成分可调及具有良好的电催化活性 ,在生物传感器和电子器件等方面具有潜在的应用前景 .取代型夹心型多金属氧酸盐具有大摩尔质量和高电荷密度 ,表现出优秀…     

可见光激发下PtⅣClx /TiO2的光诱导电子转移研究

1998年, Kisch等[1]发现PtⅣ卤化物修饰的TiO2催化剂(PtⅣClx/TiO2)具有可见光活性, 他们认为PtⅣ卤化物作为光敏化物种, 能够将电子转移到TiO2导带, 催化剂的表面吸附氧捕获电子后生成氧自由基, 继而氧化降解成对氯苯酚. 但是, 由于PtⅣ卤化物及其激发态能级的不确定, 对其反应机理研究尚未见报道.     

无皂乳液聚合制备光敏聚合物微球及其光响应性

利用红外光谱(IR)和核磁共振(1H NMR)对所制备的光敏可聚合单体重氮萘醌苯磺酸甲基丙烯酸羟乙酯(DNQMA)进行了表征. 采用无皂乳液聚合方法制备DNQMA与甲基丙烯酸叔丁酯(t-BMA)的共聚合光敏微球. 利用紫外光谱(UV/Vis)、动态光散射(DLS)、扫描电镜(SEM)对光敏微球在光照前后形态的变化进行了表征. DLS的研究结果表明在水分散液中, 光敏微球的尺寸随光照时间的增加, 先增大, 然后达到平衡. 这与紫外光谱中DNQMA特征吸收达到饱和的时间相一致. SEM研究结果表明光敏微球的形态在光照后破坏很严重, 并基本解体.     

Cover Picture: Gold Nanoparticles Decorated with Sialic Acid Terminated Bi‐antennary N‐Glycans for the Detection of Influenza Virus at Nanomolar Concentrations (ChemistryOpen 6/2015)

Gold nanoparticles decorated with full‐length sialic acid terminated complex bi‐antennary N‐glycans, synthesized with glycans isolated from egg yolk, were used as a sensor for the detection of both recombinant hemagglutinin (HA) and whole influenza A virus particles of the H1N1 subtype. Nanoparticle aggregation was induced by interaction between the sialic acid termini of the glycans attached to gold and the multivalent sialic acid binding sites of HA. Both dynamic light scattering (DLS) and UV/Vis spectroscopy demonstrated the efficiency of the sensor, which could detect viral HA at nanomolar concentrations and revealed a linear relationship between the extent of nanoparticle aggregation and the concentration of HA. UV/Vis studies also showed that these nanoparticles can selectively detect an influenza A virus strain that preferentially binds sialic acid terminated glycans with α(2→6) linkages over a strain that prefers glycans with terminal α(2→3)‐linked sialic acids.     

Strong binding affinity of a zinc-porphyrin-based receptor for halides through the cooperative effects of quadruple C-H hydrogen bonds and axial ligation

A new type of host compound (1), tetraphenyl zinc-porphyrin (ZnTPP) that contains four triazole groups at the ortho-position of each phenyl group, has been synthesized and characterized by using (1)H, (13)C NMR, and MALDI-TOF-MS analyses. The host-guest complex formation between 1 and halides was investigated by using (1)H NMR spectroscopy in [D(6)]DMSO. The triazole, benzyl, and phenylene proton signals were shifted upfield by the addition of halides in the form of tetrabutylammonium salts, which implies that the triazole protons in 1 are allocated very closely to the porphyrin ring and are directed toward the binding pocket over the porphyrin ring during the formation of hydrogen bonds. The UV/Vis absorption spectra showed that both the Soret and Q band absorptions of 1 underwent a strong redshift due to the addition of halides. Compound 1 exhibited surprisingly strong binding affinities for the halides, where the association constants for Cl(-), Br(-), and I(-) binding were estimated to be larger than 10(8), 1.79×10(7), and 1.84×10(5) M(-1), respectively. The UV/Vis absorption changes and the result of competitive titration using 4-tert-butylpyridine indicated that the cooperative effects of axial coordination and C-H···X hydrogen bond interactions resulted in the strong binding affinity of 1 to halides.     

Photocontrolled On‐Surface Pseudorotaxane Formation with Well‐Ordered Macrocycle Multilayers

The photoinduced pseudorotaxane formation between a photoresponsive axle and a tetralactam macrocycle was investigated in solution and on glass surfaces with immobilized multilayers of macrocycles. In the course of this reaction, a novel photoswitchable binding station with azobenzene as the photoswitchable unit and diketopiperazine as the binding station was synthesized and studied by NMR and UV/Vis spectroscopy. Glass surfaces have been functionalized with pyridine‐terminated SAMs and subsequently with multilayers of macrocycles through layer‐by‐layer self assembly. A preferred orientation of the macrocycles could be confirmed by NEXAFS spectroscopy. The photocontrolled deposition of the axle into the surface‐bound macrocycle‐multilayers was monitored by UV/Vis spectroscopy and led to an increase of the molecular order, as indicated by more substantial linear dichroism effects in angle‐resolved NEXAFS spectra.     

Dinuclear Complexes of Flexidentate Pyridine-Substituted Formazanate Ligands

The utility of flexidentate pyridyl-substituted formazanate ligands for assembling dinuclear coordination complexes with iridium(III) and/or platinum(II) building blocks is demonstrated herein. The dinuclear complexes are prepared either via a stepwise strategy, adding one metal unit at a time, or via one-pot self-assembly. Eight of the new complexes, including both mononuclear precursors and dinuclear products, are structurally characterized by single-crystal X-ray diffraction and NMR spectroscopy, revealing several distinct binding modes of the formazanates. All complexes are characterized by UV/Vis absorption spectroscopy and cyclic voltammetry. The frontier orbitals are primarily localized on the formazanate ligand, and a characteristic, intense formazanate-centered π→π* absorption band is observed in the absorption spectra.     

新型可聚合激光染料及双发色团共聚物的合成

通常染料激光的工作介质是染料溶液,因而限制了在一些技术领域的应用.因此近年来人们将研究兴趣转移到固体激光染料[1～3].激光染料的固体基质相对于其液体溶液存在着显著的技术优势:紧密性、可加工性、无毒、不易燃、无蒸发、易于器件集成化等等.聚合物或硅胶均可用作激光染料的固体基质,用作基质的聚合物与激光染料有很好的相容性,光均一性,且其制作成本低廉.近期报道将激光染料与甲基丙烯酸甲酯进行共聚得到了性能优良的固体激光材料[4],由于激光染料与聚合物链直接相连,减少了耗能,避免了染料过快的降解,大大提高了其光稳定性和激光输出…     

UV/Vis Action Spectroscopy and Structures of Tyrosine Peptide Cation Radicals in the Gas Phase

We report the first application of UV/Vis photodissociation action spectroscopy for the structure elucidation of tyrosine peptide cation radicals produced by oxidative intramolecular electron transfer in gas‐phase metal complexes. Oxidation of Tyr‐Ala‐Ala‐Ala‐Arg (YAAAR) produces Tyr‐O radicals by combined electron and proton transfer involving the phenol and carboxyl groups. Oxidation of Ala‐Ala‐Ala‐Tyr‐Arg (AAAYR) produces a mixture of cation radicals involving electron abstraction from the Tyr phenol ring and N‐terminal amino group in combination with hydrogen‐atom transfer from the C_α positions of the peptide backbone.     

RAMPED-UP NMR: multiplexed NMR-based screening for drug discovery

The crucial step in drug discovery is the identification of a lead compound from a vast chemical library by any number of screening techniques. NMR-based screening has the advantage of directly detecting binding of a compound to the target. The spectra resulting from these screens can also be very complex and difficult to analyze, making this an inefficient process. We present here a method, RAMPED-UP NMR, (Rapid Analysis and Multiplexing of Experimentally Discriminated Uniquely Labeled Proteins using NMR) which generates simple spectra which are easy to interpret and allows several proteins to be screened simultaneously. In this method, the proteins to be screened are uniquely labeled with one amino acid type. There are several benefits derived from this unique labeling strategy: the spectra are greatly simplified, resonances that are most likely to be affected by binding are the only ones observed, and peaks that yield little or no information upon binding are eliminated, allowing the analysis of multiple proteins easily and simultaneously. We demonstrate the ability of three different proteins to be analyzed simultaneously for binding to two different ligands. This method will have significant impact in the use of NMR spectroscopy for both the lead generation and lead optimization phases of drug discovery by its ability to increase screening throughput and the ability to examine selectivity. To the best of our knowledge, this is the first time in any format that multiple proteins can be screened in one tube.