可再生使用的溶胶-凝胶甲胎蛋白免疫传感器

可再生使用的溶胶-凝胶甲胎蛋白免疫传感器;溶胶-凝胶(sol-gel); 免疫传感器; 甲胎蛋白; 再生     

超薄硅溶胶-凝胶修饰膜的制备与表征

报道了一种制备硅溶胶－凝胶膜（sol-gel)的新方法。通过对形成溶胶和凝胶化过程的控制，获得了制备超薄溶胶－凝胶膜的最佳条件，并对膜的性质进行了一系列表征。实验表明，所得溶胶－凝胶膜具有良好的结构特征。采用光度法、电化学方法可有效地对膜的厚度进行表征。     

基于纳米自组装技术的功能化溶胶-凝胶过氧化氢生物传感器

结合功能化溶胶-凝胶(sol-gel)网络结构、自组装技术和纳米粒子效应,提出一种生物传感界面构建方法.利用自组装技术在玻碳电极表面组装氨基化sol-gel膜,通过与自组装膜间的强烈作用将纳米金粒子固定于sol-gel网络中,再通过静电吸附作用实现辣根过氧化物酶(HRP)在纳米金粒子表面的固定化,构建纳米自组装HRP传感界面.将制备的传感器用于对H2O2的催化还原,很好地保持了酶的生物活性,改善了传感器的灵敏度.     

溶胶-凝胶型陶瓷碳硫离子选择性电极的研制

将溶胶-凝胶技术与印制电极技术相结合制作了复合陶瓷碳硫离子选择性电极。对溶胶-凝胶形成条件和印刷浆液的组成进行了试验,电极制作过程包括电极膜基质制备、溶胶、凝胶型型陶瓷碳硫离子敏感膜制备、敏感膜在基质上的固定化三步。对电极的参数进行了测试。该电极稳定性、重现性好,响应快。应用于实际和模拟样品分析,取得满意效果。采用该法制备离子选择性电极具有简易、价廉、易集成化等特点,适合于制作一次性使用的离子选择性电极。     

纳米溶胶-凝胶膜修饰电极及电化学催化性能

报道了以纳米硅溶胶-凝胶（sol-gel）膜为载体的化学修饰电极。用sol-gel法在金电极上固定亚甲蓝及硫堇，发现固定于纳米硅溶胶-凝胶膜内的亚甲蓝和硫堇均有良好的电化学活性，并对同时固定于膜内的NADH、血红蛋白等生物分子产生显著的催化氧化还原作用。     

溶胶凝胶修饰电极在微孔通道中的电化学行为的探索

采用溶胶凝胶技术与恒电位电沉积方法,将多维网状结构的SiO2凝胶固定在电极表面,这种SiO2凝胶材料具有多孔性、热稳定性、化学惰性及制备简单等优点。在最优条件下,采用交流阻抗技术(EIS)及循环伏安技术(CV),成功构建了多维微通道电子传递模型。这种具有多维微通道式网状结构的溶胶凝胶材料被固载在电极表面,可模拟微观界面的细胞生物膜的电子传递。     

烷氧基硅烷溶胶-凝胶反应机理

利用烷氧基硅烷作为前驱体之一,进行溶胶-凝胶(sol-gel)反应制备无机氧化物和有机－无机杂化材料,近几十年来一直是一个研究热点。对烷氧基硅烷的sol-gel反应过程,特别是起始的水解和初步缩合过程已有较多的研究。本文综述了烷氧基硅烷的sol-gel反应机理研究的进展,并对未来发展提出了看法。     

溶胶-凝胶基质修饰的碘离子选择电极

研制了一种用溶胶 -凝胶作为基质 ,进行化学修饰的碘离子选择电极 ,并对溶胶 -凝胶包埋活性敏感物质的条件和电极响应机理进行了优化和探讨 ;电极Nernst响应范围为1.0×10 -1～5.0×10 -7mol/L,斜率为58.0mV/pc ,检出限为1.0×10-7 mol/L;电极制作简单 ,成本低廉 ,易于成批生产和微型化 ,具有可在严酷条件下使用的特点 ;电极用于样品分析 ,结果令人满意     

基于溶胶-凝胶及印制技术制备复合陶瓷碳pH电极

将溶胶－凝胶技术与丝网印制技术相结合研制了一种新型复合陶瓷碳pH电极和参比电极，并组合制备了PH复合电极，PH电极利用天然沸石作质子接受体，用溶胶－凝胶法进行固定，对溶胶－产法与印制技术相结合制作包埋沸石的复合陶瓷碳敏感的条件进行了实验，并对电极参数进行了测试，该电极测定范围为PH1－12，响应斜率为0.06V/dec。电极稳定性，重现性好，响应愉，利用此电极对多种水样进行了分析，取得了满意效果，采用该法制备离子选择性电极具有简易，价廉，易批量化生产和推广应用等特点。     

溶胶-凝胶包埋法制备银离子选择电极的研究

研制了一种用溶胶 凝胶技术包埋电活性物质的银离子选择电极。研究了包埋过程的变量参数及电极的响应机理。电极Nernst响应范围为 1.0× 10 - 1～ 1.0× 10 - 5mol·L- 1,斜率为5 5 .5mV·pc- 1,检出限为 3.1× 10 - 6mol·L- 1。该电极响应快 ,体积小 ,制作简单 ,使用方便 ,具有坚固耐磨 ,可在严酷条件下使用的特点。此研究对进一步研制溶胶 凝胶ISFET化学传感器和生物传感器具有探索意义     

二氧化碳和丙烯直接合成甲基丙烯酸的NiPMo/TiO2催化剂的研究

用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%.     

Synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives

Different approaches for the synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives from simple amino acids have been investigated. A library of 33 precursors for the preparation of N-hydroxy pyrazinones was obtained in moderate to good yields.     

Toward new camptothecins. Part 6: Synthesis of crucial ketones and their use in Friedländer reaction

In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated as by-products of some experiments.     

CoFe2O4自形成磁性液体场致结构化对磁化的影响

The Langevin paramagnetic theory can’t describe the relation between magnetization of ferrofluids and applied magnetic field. The structuralization of ferrofluids, which is considered the main influence factor of the magnetization, is regarded. The part of magnetization works is deposited when the structure is forming. This action influences the magnetization of ferrofluids directly or indirectly. On the base of the “compressing” model, the Langevin function that usually describes the magnetization of ferrofluid is modified, and a well-fitted curve is obtained. An equation of the relation between the equivalent volume fraction after being “compressed” and the intensity of magnetic field is discovered, which approximately describes the process of magnetization. The relation between the approximate initial susceptibility and the volume fraction can be obtained from modified formula.     

Highly regioselective Buchwald–Hartwig amination at C-2 of 2,4-dichloropyridine enabling a novel approach to 2,4-bisanilinopyridine (BAPyd) libraries

The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines.     

KMnO4-mediated oxidative CN bond cleavage of tertiary amines: Synthesis of amides and sulfonamides

KMnO₄-mediated oxidative CN bond cleavage of tertiary amines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields.     

Chemistry of heterocyclic compounds at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, over 50 years (Review)

The review contains a concise historical account and information on the most significant researches undertaken by the staff at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry of Heterocyclic Compounds. Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008.     

A general and convenient synthesis of 4-(tosylmethyl)semicarbazones and their use in amidoalkylation of hydrogen,heteroatom, and carbon nucleophiles

A general synthesis of previously unknown semicarbazone-based α-amidoalkylating reagents, 4-(tosylmethyl)semicarbazones, has been developed. The synthesis involved three-component condensation of semicarbazones of aliphatic or aromatic aldehydes with the same or other aldehydes and p-toluenesulfinic acid. The scope and limitations of this reaction were investigated. The compounds obtained were demonstrated to be an efficient α-(4-semicarbazono)alkylating agents. They were reacted with H- (sodium borohydride), O- (sodium methylate), S- (sodium phenylthiolate), N- (pyrrolidine, sodium succinimide), P- (trialkyl phosphites), and C-nucleophiles (sodium diethyl malonate) to give the corresponding products of the tosyl group substitution, 4-substituted semicarbazones, including analogues of nitrofurazone. Among the prepared compounds tested in vitro for antibacterial and antifungal activity, three nitrofuryl-containing semicarbazones exhibited high biological activities with minimum inhibitory concentration (MIC) values of 8–32 μg/mL.     

Sulfur-directed metal-free and regiospecific methyl C(sp3)–H imidation of thioanisoles

Regiospecific and direct imidation of the methyl C(sp³)–H bond of thioanisoles is realized under mild and metal-free conditions with N-fluorobis(benzenesulfonyl)imide as an oxidant and nitrogen source. Proposed mechanism suggests that thionium ion intermediates and a Pummerer-type reaction are involved. The imidation has advantages such as high step-economy, excellent functionality tolerance, and regiospecificity, giving structurally diverse imidation products.     

Synthesis of novel chiral bidentate hydroxyalkyl-N-heterocyclic carbene ligands and their application in palladium-catalyzed Mizoroki–Heck couplings and asymmetric addition of diethylzinc to benzaldehyde

A small library of new chiral bidentate hydroxyalkyl-imidazolium salts 1 is conveniently synthesized on multi-gram scale from inexpensive and commercially available chiral pool amino acids. The corresponding carbenes, generated by deprotonation of imidazolium salts 1, in combination with palladium(II) chloride were tested in the Mizoroki–Heck coupling reaction. The most significant results in terms of yields and reactivities were achieved with low catalyst loading. The catalytic activities of these imidazolium salts were also investigated in the asymmetric addition of diethylzinc to benzaldehyde. The use of MgO nanoparticles as an additive in conjunction with these ligands played a crucial role in increasing the efficiency of these reactions.