共查询到18条相似文献,搜索用时 156 毫秒
1.
手性是自然界中广泛存在的现象。通常情况下,对映异构体在生物体内有着不尽相同、甚至完全相反的代谢、毒理及药理学特性。因此,研究简单高效、快速灵敏的手性识别方法,在分析化学、生物医学、药学等领域都有着非常重要的意义。然而,对映异构体有着几乎完全相同的理化性质,这导致它们的选择性识别异常困难。近年来,由于碳纳米管(CNTs)独特的原生手性,使其在对映异构体的识别中展现出卓越性质,为手性电化学传感器的研究开拓了新路径。目前利用CNTs原生手性作为识别材料的电化学传感器的综述未见报道。详细总结了近十年来CNTs原生手性电化学传感器的研究进展,包括其构建方法、识别机理以及相关应用。最后,讨论了该领域现存的挑战,展望了其未来的发展前景。 相似文献
2.
手性化合物在生命活动中起着重要作用,在医药学领域备受关注,建立快速高效的手性分析方法刻不容缓。手性传感方法具有专属性强、灵敏性高、操作简便、样品用量少等优点,能够快速确定对映体的绝对构型及对映体过量值。氨基、羟基和羧基是手性化合物中常出现的基团,也是手性传感器研究的重要对象。聚焦于纳米粒、量子点类手性传感材料和可用于手性传感的小分子化合物,综述了手性传感器在不同类型小分子的手性识别中的应用,并对手性传感器的发展进行了展望。 相似文献
3.
电化学传感器检测植物生长调节剂的研究进展 总被引:1,自引:0,他引:1
近年来,植物生长调节剂(PGRs)的检测方法备受研究者广泛关注。由于电化学传感器具有较高的灵敏度和选择性、响应时间短、成本低、方便携带等优点,在现场快速检测中受到研究者的青睐。从电化学传感器检测PGRs的4个方面进行了总结:1)直接电化学行为传感,主要是通过不同的修饰材料对电极进行增敏,从而实现对具有电化学活性的PGRs进行直接检测;2)电化学生物传感,主要通过酶和抗原抗体对PGRs进行特异性识别;3)光电化学传感,主要是利用具有光催化性能的材料实现对电化学活性较差的PGRs进行光电转化检测;4)分子印迹电化学传感,通过构建能够特异性识别PGRs的聚合物薄膜从而进行专属检测。同时对电化学传感器现状进行了阐述以及对未来发展趋势进行展望。 相似文献
4.
5.
分子印迹手性识别机理及在色谱分离中的应用 总被引:1,自引:0,他引:1
分子印迹聚合物作为一种具有分子识别能力的新型手性固定相,具有可预测洗脱顺序、分离选择性高、物理化学稳定性好等优点,目前已在色谱手性分离领域取得应用。介绍了分子印迹技术及其手性识别机理的最新研究进展,对该技术在色谱分离领域的应用现状、存在的问题及解决方法进行了重点评述,并展望了其今后的发展方向。 相似文献
6.
当今社会对单一对映体的需求越来越大,由于手性表面活性剂具有区域选择性、手性催化能力及手性识别能力,因而在手性合成、手性识别及手性拆分中的应用也越来越受封重视。文章综述了近年来手性表面活性剂在不对称催化、乎性识剐及手性拆分中的应用。 相似文献
7.
手性配合物具有丰富的配位结构,在手性功能材料、不对称催化合成、手性识别与拆分等研究中表现出潜在的应用前景,已成为配位化学、材料化学及晶体工程等研究中的前沿领域之一。 相似文献
8.
拆分手性化合物、提纯有利生物活性的对映异构体在食品、制药、生命科学等领域具有重要意义。分子印迹聚合物(MIP)是一种人工合成的具有对目标物质定向亲和性的聚合物,基于MIP制造的手性选择剂具有更高的亲和力和选择性,同时更易于制备和更为稳定,因此在手性拆分领域得到了广泛应用。综述了MIP材料在手性拆分中用于样品前处理、手性固定相(CSP)、传感器的研究进展,并介绍了提高手性选择能力的新策略,包括手性树状大分子、表面印迹载体、金属离子、纳米MIP、手性功能单体、协同辅助材料等,展望了MIP手性拆分未来的发展方向。 相似文献
9.
10.
11.
12.
13.
The effect of the constituting amino acid residue [Glu(OBzl)] number on the chiral recognition ability was investigated. Chiral recognition sites were prepared from oligopeptide derivatives (constituting amino acid residue number = three–five) by adopting alternative molecular imprinting. It was made clear that with a constituting amino acid residue number of four, the tetrapeptide derivative of Glu(OBzl) is the best candidate material to generate a chiral recognition site among eight types of oligopeptide derivatives in the study. The affinity constant between Ac‐L ‐Trp and a chiral recognition site ranged from 3.4 × 103 to 1.08 × 104 mol?1 dm3, depending on the number of Glu(OBzl) residues in an oligopeptide derivative. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 95: 1302–1309, 2005 相似文献
14.
15.
Angelo Gössi Wolfgang Riedl Boelo Schuur 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2018,93(3):629-644
Chiral resolution of racemic products is a challenging and important task in the pharmaceutical, agrochemical, flavor, polymer and fragrances industries. One of the options for these challenging separations is to use liquid membranes. Although liquid membranes have been known for almost four decades and have been used for optical resolutions, no comprehensive review has been published about the use of this technology for enantioseparations. In this review, the various liquid membrane‐related technologies are described and compared, including bulk liquid membranes, emulsion liquid membranes, micelle‐extraction and micellar enhanced ultrafiltration, as well as supported liquid membranes. Next to technological advances, an overview of recent developments in chiral recognition chemistry in liquid–liquid equilibria is presented. The following extractant classes have recently been reported in conjunction with chiral separation: cyclodextrines, BINOL's, calixarenes, crown ethers, BINAP's, tartaric acids and ionic liquids. The use of two supported (non‐liquid) membranes with an inner loop of extract phase appears to be the most stable liquid membrane configuration, allowing for a large degree of freedom in operational conditions such as solvent to feed ratio. The library of solvents still needs broadening to make the technology more versatile and based on the variety of successes with catalytically active organometallic complexes, development of new chiral selector systems based on asymmetric catalysis literature is suggested for future selector screening studies. © 2017 Society of Chemical Industry 相似文献
16.
简要介绍了手性表面活性剂。重点综述了氨基酸型、葡萄糖苷型、松香型、酒石酸型和麻黄素型手性表面活性剂的合成,阐明了手性表面活性剂在立体选择性合成、手性化合物的分离(如药物分离)以及手性无机材料合成上的应用,最后对手性表面活性剂的应用前景进行了展望。 相似文献
17.
Minglei Tian Hongyuan Yan Kyung Ho Row 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2009,84(7):1001-1006
BACKGROUND: There is much interest in the recognition and determination the two ofloxacin enantiomers, not only from the point of view of investigating the pharmacokinetics of the enantiomers in vitro but also in the design and development of new chiral pharmaceutics. RESULTS: Chiral separation was performed on a C18 column, in which the mobile phase consisted of a methanol–water solution (containing different concentrations of L ‐phenylalanine and copper sulfate) and its flow rate was set at 0.7 mL min?1. The effect of different kinds and concentration of ligands, bivalent copper ion, organic modifier, ionic liquid modifier, pH of mobile phase, and temperature on enantioseparation were evaluated and the results show that the enantioselectivity was strongly affected by the pH and ligand concentration of the mobile phase. Under optimal conditions, baseline separation of the two enantiomers was obtained with a resolution of 4.69 in less than 40 min. CONCLUSION: The mechanism of chiral discrimination is based on the stabilities of the copper(II) binary complexes and their ternary diastereomeric complexes with amino acids formed in solution and stationary phase. The proposed method could be used for the quality evaluation of ofloxacin enantiomers. Copyright © 2009 Society of Chemical Industry 相似文献
18.
手性药物的研究与开发已成为当今世界新药发展的战略方向和热点领域.1999年,全球手性药物市场销售额第一次超过1000亿美元,达到1150亿美元,比1998年增长16%,占世界药品市场总销售额3600亿美元的32%.预计2003年将达到1460亿美元,以8%的速度增长.通过外消旋转化、上市药物组合物和开发新型手性单一异构体药物,手性药物正在成为制药公司谋求利益和提升地位的工具.手性中间体、对映选择技术和手性分离技术为精细化学品工业提供了机会. 相似文献