化学发光二维两点检测微流控芯片系统

化学发光二维两点检测微流控芯片系统设计集成了一种可用于分离检测氨基酸、多肽和蛋白质等复杂样品的化学发光二维两点检测微流控芯片系统.该系统采用双检测器同时检测第一维和第二维的分离峰信息,可获得样品的二维分离谱图,满足了对多种复杂结构微流控芯片分离特性进行研究的要求.     

微流控系统在生化分析领域的新应用

微流控芯片是近年来新兴的研究领域,它由微米级别的微通道及辅助器件构成,并且有着低试剂消耗量、响应时间短、高精度、高灵敏度、高集成度和独特的微观物理现象等特性.微流控芯片的独特优势为生物样品的处理与分析、生物模拟、药物传递和多组分分析等领域提供了前所未有的机会.为获得理想、完善的微流控平台,还需进一步挖掘微流控芯片的潜在...     

微流控芯片技术在生命科学研究中的应用

微流控芯片最初起源于分析化学领域,是一种采用精细加工技术,在数平方厘米的基片,制作出微通道网络结构及其它功能单元,以实现集微量样品制备、进样、反应、分离及检测于一体的快速、高效、低耗的微型分析实验装置.随着微电子及微机械制作技术的不断进步,近年来微流控芯片技术发展迅猛,并开始在化学、生命科学及医学器件等领域发挥重要作用.本文首先简单介绍了微流控芯片制作材料和工艺,然后主要阐述了其在蛋白质分离、免疫分析、DNA分析和测序、细胞培养及检测等方面的应用进展.     

微流控芯片电泳的研究进展

该文综述了微流控芯片电泳的制备、结构和应用,比较了不同材料微流控芯片电泳的制备机理、表面改性和性能特点,归纳和总结了不同结构微流控芯片电泳的进样、分离和检测系统以及不同类型微流控芯片电泳在荧光物质、金属离子、糖、药物、核酸、DNA、氨基酸、多肽和蛋白质分析中的应用,并对微流控芯片电泳的未来发展方向做了展望.     

微流控芯片电泳技术在临床检测中的新进展

微流控芯片电泳技术作为一种消耗少、速度快、效率高的分析技术,可同时实现便携化、集成化、高通量,在临床检测中发挥着重要作用。该文综述了近年来微流控芯片电泳技术在临床应用方面的研究进展,主要包括微流控芯片电泳技术在小分子、氨基酸、蛋白质、核酸、细胞等方面的应用近况。同时,介绍了一种崭露头角的基于大管电泳技术的大通道电泳微流控芯片技术,最后对微流控芯片电泳技术实现临床分析进行了展望。     

基于微流控芯片的固相萃取技术的研究进展

作为近年来最前沿的分析技术之一,微流控芯片技术具有高通量、微型化、多功能和集成化等独特优势,目前,该技术主要以生命科学体系为研究对象。但由于生化样品存在基质效应与干扰组分,使得样品分析备受干扰。因此发展微流控芯片中的样品前处理技术,对于样品尤其是复杂的生物样品的纯化和富集极其重要,同时这也是微流控芯片系统走向集成化和微型化必须突破的瓶颈之一。本文针对应用广泛的固相萃取技术,重点综述了微流控芯片上固相萃取技术的几种不同模式即开管柱、填充柱以及整体柱的特点及优缺点,并对微流控芯片系统的发展做出了展望。     

微流控芯片技术在蛋白质分析中的应用进展

近年来,微流控芯片技术取得了显著的发展。随着微电子及微机械等制作技术的不断进步,高通量、高效、快速、低成本的微流控分析芯片在蛋白质和多肽分析方面获得了令人瞩目的成果。本文主要介绍了微流控芯片在蛋白质组学分析研究的应用和发展。引用文献52篇。     

微流控芯片技术及在药物分析中的应用研究进展

微流控芯片由于具有试剂和样品用量少、分析速度快、分离效率高、体积小等优点,近几年发展迅速,已应用于医药、化学和生物等领域.本文就微流控芯片的最新研究进展以及它在药物分析中的应用作简要的综述.引用参考文献58篇.     

微流控芯片在食品安全分析中的应用进展

微流控芯片技术可以实现从样品处理到检测的微型化、自动化、集成化及便携化,因而在食品安全检测方面展现出强大的发展活力。目前微流控芯片技术在农药残留、兽药残留、重金属、食品添加剂等食品安全检测方面已取得了一系列重要进展。该文着重介绍了微流控芯片技术在食品安全分析中的研究进展,并展望了其在食品安全分析中的应用前景。     

微流控芯片分析及其在酶抑制剂筛选中的应用*

微流控芯片以其消耗少、易于微型化和集成化等优点在酶分析领域占有重要地位。近年来随着新检测技术的不断出现,酶抑制剂筛选芯片的结构也从简单的“混合-反应”和“分离-检测”,变得更加多样化和多功能化。微流控芯片上分子固定化酶、细胞培养等技术的进步为微流控芯片上实现酶抑制剂的高通量和高内涵筛选带来了巨大优势。本文对用于酶分析的微流控芯片的种类和构型进行简介和归纳总结,重点讨论和综述了其在酶抑制剂筛选中的应用及其最新研究进展。     

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%.     

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.     

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.     

Selective syntheses of 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones via temperature-dependent Rh(II)-carbenoid-mediated 2H-azirine-ring expansion

The Rh(II)-catalyzed reaction of 2-carbonyl-substituted 2H-azirines with ethyl 2-cyano-2-diazoacetate or 2-diazo-3,3,3-trifluoropropionate provides an easy access to 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones. These compounds can be selectively prepared from the same starting material using temperature as the only varied parameter. The 2-azabuta-1,3-diene intermediate, a common precursor for both heterocyclic products, isomerizes into 2H-1,3-oxazine under kinetic control, while 1H-pyrrol-3(2H)-one is the sole product of the reaction at elevated temperatures. According to DFT-calculations a one-atom oxazine ring contraction involving ring-opening to a 2-azabuta-1,3-diene intermediate, followed by a 1,5- and 1,2-prototropic shift leads to the consecutive formation of imidoylketene and azomethine ylide, which then further undergo cyclization to the pyrrole derivative.     

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.