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1.
采用抗坏血酸还原法制备Ag球粒子,然后用3-(甲基丙烯酰氧)丙基三甲氧基硅烷使其表面硅烷化,最后用虚拟模板分子松香酸代替模板分子孔雀石绿与功能单体甲基丙烯酰胺反应合成虚拟印迹聚合物.结果表明,生成的\"核-壳\"式复合基底比Ag的表面增强拉曼散射(SERS)增强效果显著,其对孔雀石绿的最低检测浓度达到10-11 mol/L.该方法实现了背景噪音的消除,提高了分析结果的准确性,为有机染料的超灵敏检测提供了参考.  相似文献   

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表面增强拉曼散射(SERS)技术在环境保护、食品工业、医学检测、生物检测等领域有广泛的应用前景。SERS基底材料和结构是影响性能的关键因素,而银纳米材料SERS基底已被广泛应用。本文介绍了SERS基底的增强机理,对近年来纯银纳米材料和银基复合纳米材料SERS基底的研究进展进行了综述,并介绍了银纳米材料SERS基底发展面临的问题,对其发展趋势进行了分析和展望。  相似文献   

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公共安全类毒物直接威胁人们的生命健康安全。表面增强拉曼散射(SERS)技术的超灵敏特点为复杂基质中痕量毒物的快速检测提供了分析策略,极大地拓展了其应用范围,有着广阔的应用前景。该文综述了SERS技术在公共安全类物质检测方面的研究进展,包括对节球藻毒素、芥子气、琥珀胆碱、甲基对硫磷、氰化物、汞离子、亚硝酸盐等毒物的检测。从基底种类的选择和评估、检测限、重复性和实际应用的角度介绍了检测体系的建立过程。分析了这些方法及其在应用中面临的技术挑战与机遇,展望了SERS技术解决现场实际检测难题的发展方向。  相似文献   

5.
表面增强拉曼散射活性基底   总被引:7,自引:0,他引:7  
表面增强拉曼散射(SERS)是人们将激光拉曼光谱应用到表面科学研究中所发现的异常表面光学现象。它可以将吸附在材料表面的分子的拉曼信号放大106到1014倍,这使其在探测器的应用和单分子检测方面有着巨大的发展潜力。由于分子所吸附的基底表面形态是SERS效应能否发生和SERS信号强弱的重要影响因素,所以分子的承载基体是很关键的,因而SERS活性基底的研究一直是该领域的研究热点之一。本文总结了形态各异的表面增强拉曼散射活性基底,分析了最新发展并对其未来作一展望。  相似文献   

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半导体纳米材料作为表面增强拉曼散射基底的研究进展   总被引:2,自引:0,他引:2  
在总结半导体纳米材料作为表面增强拉曼散射(SERS)基底的一些相关研究工作的基础上, 讨论了半导体纳米粒子SERS基底的增强效应与纳米材料的种类、尺寸的相关性; 对半峰宽、激发波长进行了分析, 并对半导体纳米材料作为SERS基底时, 化学增强、电磁增强、纳米半导体缺陷和激子波尔半径的影响等进行了阐述.  相似文献   

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蛋白质分子印迹   总被引:2,自引:0,他引:2  
分子印迹技术是一种新型的高效分离技术,具有空间选择性识别特性。本文介绍了分子印迹技术在蛋白质大分子上的应用和发展,包括蛋白质分子印迹选用的单体和交联剂、印迹方法、印迹机理、蛋白质分子印迹技术的应用以及存在的一些问题。  相似文献   

8.
表面分子印迹研究进展   总被引:3,自引:0,他引:3  
为了拓展分子印迹聚合物(Molecularly Imprinted Polymers,MIP)的应用领域,表面分子印迹作为一种新的方法,受到了极大的关注。本文首先分析了MIP传统制备方法存在的问题;然后依据印迹位点所处位置的不同,分类综述了表面分子印迹的各种方法。  相似文献   

9.
急性脑梗死(Acute cerebral infarction, ACI)具有起病急、死亡率高的特点,快速判断ACI的发生发展对患者的诊治和预后方案的制定具有关键作用。研究表明,人血清中触珠蛋白(Haptoglobin, Hp)的含量水平与ACI有关。本研究采用表面增强拉曼散射技术(Surface enhanced Raman scattering, SERS)结合免疫反应,建立了血清中Hp的定量分析方法。首先,在硅片上制备银纳米粒子SERS基底,以4-巯基苯甲酸(4-Mercaptobenzoic acid, MBA)为拉曼探针,通过形成Ag—S键将其连接在纳米粒子表面,MBA的羧基与自制的高效价Hp抗体的氨基通过酰胺键共价交联连接到SERS基底上,从而形成检测Hp的SERS自组装芯片(Ag/MBA/anti-Hp)。Hp可以被Ag/MBA/anti-Hp基底上的抗体特异性捕获,从而引起MBA的SERS特征峰发生位移。结果表明,Hp浓度的对数与MBA的SERS特征峰位移之间存在良好的线性关系,线性范围为1~1000 ng/mL(R2=0.988)。采用本方法对90例ACI患者血清中的Hp浓度进行了测定,测定结果与ELISA方法的结果一致,证明了本方法的实用性和准确性。本方法特异性强,简易便捷,实现了对血清中Hp的特异性识别及定量分析,有望成为临床检测血清中Hp的有效手段,为ACI患者的治疗和预后方案的制定提供参考。  相似文献   

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本文将磁性基底与分子印迹技术、表面增强拉曼光谱(SERS)技术相结合,以Fe3O4/氧化石墨烯(GO)/Ag为基质材料、盐酸多巴胺为功能单体、诺氟沙星为模板分子,制备了一种新型磁性分子印迹聚合物Fe3O4/GO/Ag-MIPs,并利用扫描电镜(SEM)、透射电镜(TEM)、能谱(EDS)与X射线衍射(XRD)等技术手段...  相似文献   

11.
A novel method has been reported for 2,6-dichlorophenol using surface-enhanced Raman scattering (SERS). SiO2/gold composites were selected as the SERS substrates to provide the response of gold nanoparticles. Molecular imprinting was subsequently used for the development of a specific detector to 2,6-dichlorophenol with precipitation polymerization. The molecularly imprinted polymer provided sensitive and selective SERS detection for the determination of 2,6-dichlorophenol. The intensity and concentration obeyed a linear relationship from 1?×?10?5 to 1?×?10?9?mol?L?1 2,6-dichlorophenol. The sensitivity of SERS with the molecularly imprinted polymers provides a promising approach for practical analysis.  相似文献   

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A novel magnetic molecularly imprinted polymer adsorbing material was successfully synthesized to detect ribavirin in animal feedstuff. Molecularly imprinted polymer was prepared through surface polymerization by using ribavirin as template molecule, methyl methacrylate, and γ‐methacryloxypropyl trimethoxy silane functionalized magnetic mesoporous silica as bifunctional monomers, and ethylene diglycidyl ether as crosslinking agent. The prepared magnetic molecularly imprinted polymer was characterized by scanning electron microscopy and infrared spectroscopy. Static and dynamic adsorption experiments and selective adsorption analysis were performed to evaluate the adsorption and selectivity of magnetic molecularly imprinted polymer. Different experiments were conducted to optimize the magnetic solid‐phase extraction conditions. Under optimal experimental conditions, a magnetic molecularly imprinted solid‐phase extraction coupled with high‐performance liquid chromatography method was successfully developed for ribavirin detection. The established method achieved a satisfactory linear range of 0.20–50 mg/L (R> 0.99) and a low detection limit (0.081 mg/kg). An average recovery of 92–105% with relative standard deviation of <6.5% was obtained upon the application of the developed method to detect ribavirin in real feedstuff samples. Thus, established method can be used for the rapid and simple separation and detection of added ribavirin in feedstuff.  相似文献   

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Primary creatine deficiency syndromes (CDS) are a new group of disorders caused by guanidinoacetate methyltransferase (GAMT) deficiency, which affects endogenous creatine biosynthesis with depletion of body creatine. A deficiency in creatine can be corrected by treatment with oral creatine supplementation and this necessitates a simple and sensitive screening method for early detection of creatine in dilute physiologic fluids. In this work an artificial receptor, molecularly imprinted polymer (MIP), for creatine was used both as a material for solid-phase extraction (SPE) and as a sensing element in a voltammetric sensor. Using the combination of molecularly imprinted solid-phase extraction (MISPE) with a complementary MIP sensor, the minimum detectable amount was found to be 0.0015 ng mL(-1) (RSD = 1.3%, S/N = 3). The MISPE-MIP sensor combination provided up to 60-fold preconcentration, which was more than sufficient for achieving the required quantification limit 50 ng mL(-1) (or 0.0025 ng mL(-1) after 2 x 10(4)-fold dilution) for creatine in human blood serum.  相似文献   

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以苏丹红Ⅰ为模板分子,α-甲基丙烯酸为功能单体,乙二醇二甲基丙烯酸酯为交联剂,偶氮二异丁腈为引发剂,在氯仿中采用沉淀聚合法制备了分子印迹聚合物.聚合物的平衡结合试验表明:模板分子/功能单体/交联剂的摩尔比为1:4:16时所得的印迹聚合物对苏丹红Ⅰ吸附量最大;合成时溶剂和引发剂用量对聚合物吸附量有很大影响;印迹和非印迹聚合物对苏丹红Ⅰ的平衡吸附量分别为49.17μmol·g-1和22.6μmol·g-1,选择性结合试验中印迹聚合物对苏丹红Ⅰ和苏丹红Ⅲ的吸附量分别为26.8μmol·g-1和5.26μmol·g-1,说明印迹聚合物对苏丹红Ⅰ具有特异性吸附;Scatchard分析表明该印迹聚合物具有两类结合位点.  相似文献   

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Molecular imprinted colorimetric sensors can realize visual semi-quantitative analysis without the use of any equipment. With the advantages of low cost, fast response, ease of handling, and excellent recognition ability, the molecular imprinted colorimetric sensor shows great application potential in the field of sample rapid assay. Molecular imprinted colorimetric sensors can be prepared in various forms to meet the needs of different sample determination, such as film, hydrogel, strip, and adsorption coating. In this review, the preparation methods for various types of molecularly imprinted colorimetric sensors are systematically introduced. Their applications in the field of on-site biological sample detection, drug detection, disease treatment, chiral substance detection and separation, environmental analysis, and food safety detection are introduced. The limitations encountered in the practical application are presented, and the future development directions prospect.  相似文献   

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胡博  高林  乔宇  车广波 《无机化学学报》2018,34(8):1531-1537
设计并制备了用于检测2,4,6-三氯苯酚的荧光分子印迹。由于铕配合物对模板分子的荧光淬灭作用,可用于荧光检测工具。荧光分子印迹在模板分子浓度范围0~70 nmol·L~(-1)内具有良好的荧光线性响应,相关系数为0.996 28。荧光分子印迹展现出了良好的灵敏度,其最低检出限为3.12 nmol·L~(-1)。荧光分子印迹具有较好的热稳定性,同时选择性检测实验证明荧光分子印迹对2,4,6-三氯苯酚具有良好的特异选择性。实验结果说明荧光分子印迹可用于选择性荧光检测低浓度氯酚类物质。  相似文献   

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该文首先通过两步化学反应合成NO识别分子3,4-二氨基苯硫醇(DABT),然后制备具有强表面拉曼增强散射(SERS)效应的银包金纳米星(AuNSs@Ag)材料,并通过Ag—S键对其进行DABT修饰,制备了比率型SERS纳米探针AuNSs@Ag-DABT.利用透射电子显微镜、水合粒径、Zeta电位以及紫外吸收光谱对纳米探针进行表征,并开展了NO的定量检测.结果表明:构建的AuNSs@Ag-DABT纳米探针表面有尖锐突出的星状结构,尺寸约为80 nm.NO存在时,DABT与NO发生反应并在541 cm-1附近出现一个新的拉曼峰(三唑环),而在1 078 cm-1处的拉曼峰(C—S离面弯曲峰)强度保持不变,因此可以根据I541/I1078的比值定量检测NO.在最优条件下,I541/I1078的比值与NO浓度在10~60 nmol/L 范围内表现出良好的线性响应,检出限为3.89 nmol/L.选择性实验表明该比率型SERS纳米探针对NO响应具有良好的专一性和抗干扰性.  相似文献   

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The surface morphology of thin molecularly imprinted polymer films has been studied using atomic force microscopy (AFM). The films were produced by spin coating onto glass substrates and examined as a function of host polymer, imprinting template, casting solvent, spin‐coater rotation speed and post‐production treatment. It was observed that the gross features of such films are template controlled. The fine structure is determined by parameters such as solvent, spin speed or subsequent treatment. The relationship between these observations, polymer–template interactions and the mechanism of film formation in spin coating is discussed. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   

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