反射式光纤银膜SPR传感器的湿法构建及应用

采用银镜反应湿法制备了反射式光纤表面等离子体共振(Surface plasmon resonance,SPR)传感器,并结合多巴胺自聚合功能对光纤表面银膜进行快速生物功能化修饰,实现了抗体抗原相互结合的在线监测。通过自行搭建SPR仪器,考察了传感区长度的影响,跟踪测定了传感器各个修饰步骤后SPR信号的变化。测试结果表明,该法制备的光纤SPR传感器具有很高的灵敏度。随着传感区长度的增加,基于SPR峰位的检测灵敏度随之增大,而基于SPR峰强的检测灵敏度无明显变化。当传感区长度为1.5 cm时,基于SPR峰位对蔗糖溶液折射率的检测灵敏度为4 166 nm/RIU,而基于SPR峰强的检测灵敏度为99%/RIU。进一步利用该传感器监测了Ig G的连接过程、Ig G抗体-抗原的相互结合过程,结果显示其可应用于生物传感检测领域。     

光纤SPR传感器的结构、膜材与应用进展

光纤表面等离子共振(Fiber optic surface plasmon resonance,FO-SPR)传感器由于体积小、易携带、抗电磁干扰等优点在生物、化学、医学及食品领域均具有广阔的应用前景。该文综述了光纤SPR传感器的结构、膜材料及其应用进展。其中终端反射式和在线传输式是光纤SPR传感器最重要的两种结构;最常用的膜材料包括金膜、银膜、复合膜和金属纳米颗粒。基于光纤SPR的实时检测、抗干扰能力强、可多通道检测等特点展望了其未来发展与应用前景。     

无标记型免疫传感器的原理及其应用

无标记型免疫传感器能够直接测定生物样品，测定过程中无需预先对被测物进行标记，适应直接、实时、原位、在线的痕量免疫分析，已经广泛应用于临床医学、环境、制药、食品等分析领域中。表面等离子共振(SPR)型免疫传感器、石英晶体微天平(QCM)型免疫传感器、电容型免疫传感器即是目前报道较多的3种无标记型免疫传感器。本文分别对这3种免疫传感器检测原理、传感器构建方式以及在生物分子检测中的应用进行了简要综述。     

表面等离子体共振技术在蛋白质-蛋白质相互作用研究中的应用

表面等离子共振(SPR)近年来迅速发展为用于分析生物分子相互作用的一项技术.该技术无需标记、特异性强、灵敏度高、样品用量小,可实现在线连续实时检测.目前SPR已被广泛应用于免疫学、蛋白质组学、药物筛选、细胞信号转导、受体/配体垂钓等领域.该文阐述了基于表面等离子体共振技术生物传感器的基本原理和技术流程,综述了SPR在蛋白质-蛋白质相互作用动力学研究、蛋白质结构及功能研究、蛋白质突变和碎片分析、信号转导中的应用以及SPR在蛋白质-蛋白质相互作用研究中的多项关键技术.指出SPR通过与光谱、电化学等多技术联用后,可以获得更加详实的信息.     

表面等离子体子共振生物传感器用于乙肝表面抗原的测定

运用自行研制的表面等离子体子共振（SPR）生物传感器，采用自组装成膜技 术并以戊二醛作偶联剂，在传感片表面修饰HBsAg单克隆抗体，将其用于乙肝表面 抗原（HBsAg)的检测。实验结果表明SPR生物传感器对HBsAg的检出限为0.06ng/mL 。与传统的酶联免疫吸附试验（ELISA）相比，SPR生物传感器的检出灵敏度明显高 于ELISA法。用该SPR生物传感器对HBsAg质控血清与纯化的HBsAg溶液进行比较检测 ，结果表明该SPR生物传感器对HBsAg具有好的特异选择性。     

表面等离子体共振传感技术和生物分析仪

表面等离子体共振（surface plasmon resonance, SPR）传感技术是生物化学分析领域常用的分析手段和研究工具,与其相关的研究不计其数,发展日新月异。本研究小组从事SPR传感技术研究近十年,从初期的理论研究、仿真计算、传感器设计以及全自动SPR生物分析仪开发与应用研究,到目前的传感器性能提高、应用拓展,时刻关注着该项技术的最新动态。本文系统综述了SPR传感技术和生物分析仪的原理、结构以及主要功能模块,SPR传感器的调制类型、耦合方式以及SPR成像传感器;介绍了结合局域表面等离子体共振（local surface plasmon resonance, LSPR）技术、改进金属膜系设计、优化数据处理算法等提高SPR生物分析仪性能的方法;阐述了SPR传感技术和生物分析仪的最新进展,包括SPR技术和微流控芯片、电化学技术、表面增强拉曼散射技术（SERS）的联用;列举了SPR生物分析仪在临床诊断、药物筛选、生物分子研究、食品安全和环境监测等领域的应用实例;最后,分析了SPR生物分析仪面临的主要问题以及未来的发展趋势。     

亲和型生物传感器在生物医学上的应用进展

近年来,生物传感器与纳米技术、流动注射和微流控等新技术的结合,获得了蓬勃而迅速的发展。 亲和型生物传感器是基于生物分子之间的特异的亲和性,即生物活性物质对底物的亲和与键合而建立起来的一种新型传感装置。 它具有特异性好、灵敏度高、成本低、能在复杂的体系中进行在线连续监测等优点,进而在生物医学领域,对生物医学标记物、核酸、蛋白质、病毒、细菌及毒素的检测、药物作用机理的研究、临床用药筛选等方面有着广泛的应用。 本文从光学、电化学、石英晶体微天平传感、表面等离子体共振等几个方面对近年来亲和型生物传感器,特别是用于检测肿瘤标记物的免疫传感器和基于核酸适体的生物传感器在生物医学领域的测定原理和应用现状进行了评述,并对其发展趋势进行了展望。     

基于酶催化银沉积质量放大的血吸虫压电免疫传感器的研究

发展了一种基于酶催化金属银沉积信号放大的新型高灵敏气相压电免疫传感检测技术.先将血吸虫抗原(SjAg)共价固定在石英晶体表面,制备得到血吸虫压电免疫传感器.检测时,在晶振上滴加不同浓度的待测血吸虫抗体,再将碱性磷酸酶标记的二抗通过夹心方式结合到传感器表面.然后利用碱性磷酸酶催化磷酸化的抗坏血酸酯水解从而还原硝酸银,使金属银沉积在晶振表面上,放大传感器的质量响应信号.实验结果表明该传感检测方法可显著提高气相压电免疫传感器的检测灵敏度,传感器对血吸虫抗体的响应线性范围在1～225 ng/mL,检测下限为1 ng/mL.     

基于水溶性共轭聚合物的蛋白质检测*

近年来,以共轭聚合物作为生物传感元件,在生物大分子（如核酸、蛋白质）特异性识别、检测方面的研究越来越受到人们的关注。共轭聚合物具有强的光捕获能力,具有倍增光学响应性,可用来放大荧光传感信号,大大提高检测的灵敏度,为生物传感器的发展提供了新的传感模式。基于共轭聚合物的新型生物传感器在医疗诊断、环境检测以及国家安全防御等方面具有广泛的应用前景。本文简要介绍了共轭聚合物的荧光信号放大机制以及在蛋白质、酶、抗原－抗体检测方面的应用。最后对共轭聚合物在蛋白质检测方面的未来发展趋势进行了展望。     

表面等离子体共振生物传感器及其应用

表面等离子体共振(Surface Plasmon Resonance,SPR)生物传感器在检测生物分子特异性结合方面具有的高灵敏度、免标记及检测快速等优点,使其在过去的20年中在生命科学、医药科学、食品安全等领域取得了快速发展。本文对SPR生物传感器进行了简要介绍,并着重对其在生命科学、医药学、环境分析、食品安全等领域的应用进行了综述,最后对该领域的研究前景进行了展望。     

Surface plasmon resonance sensing of nucleic acids: A review

Biosensors based on surface plasmon resonance (SPR) have become a central tool for the investigation and quantification of biomolecules and their interactions. Nucleic acids (NAs) play a vital role in numerous biological processes and therefore have been one of the major groups of biomolecules targeted by the SPR biosensors. This paper discusses the advances of NA SPR biosensor technology and reviews its applications both in the research of molecular interactions involving NAs (NA–NA, NA–protein, NA–small molecule), as well as for the field of bioanalytics in the areas of food safety, medical diagnosis and environmental monitoring.     

Proteomic applications of surface plasmon resonance biosensors: analysis of protein arrays

Proteomics is one of the most important issues in the post-genomic area, because it can greatly contribute to identifying protein biomarkers for disease diagnosis and drug screening. Protein array is a key technology for proteome researches and has been analyzed by various methods including fluorescence, mass spectrometry, atomic force microscopy and surface plasmon resonance (SPR). SPR biosensor is a promising technology in proteomics, since it has various advantages including real-time measurement of biomolecular interactions without labeling and the simple optical system for the device. SPR biosensors have a strong potential for analyzing proteomes by SPR imaging and SPR spectroscopic imaging, even though the challenge is to produce proteins on a proteomic scale.     

Surface plasmon resonance-enabled mass spectrometry arrays

Biosensors that utilize surface plasmon resonance (SPR) as a method of detection of protein interactions can be used for selective separation of proteins prior to MS analysis. The combination of SPR and MS results in a unique multiplexed detection technology capable of both quantitative and qualitative protein analysis. To further the development of a high-throughput SPR-MS approach, the possibility of arraying binding ligands on SPR chips for affinity capture of proteins and their MS analysis was explored. Antibodies to beta-2-microglobulin, cystatin C, transferrin, and insulin-like growth factors I and II were arrayed on a large number of SPR chips. Human plasma samples were injected over the antibody array chips in an SPR Biosensor, after which on-chip MS analysis was performed to detect the bound proteins. Signals from the targeted proteins were observed for each antibody-derivatized chip, indicating successful antibody immobilization and protein capture. The SPR-MS arrays are robust, highly reproducible, and are capable of high-throughput analysis.     

Effect-based proteomic detection of growth promoter abuse

Unregulated growth promoter use in food-producing animals is an issue of concern both from food safety and animal welfare perspectives. However, the monitoring of such practices is analytically challenging due to the concerted actions of users to evade detection. Techniques based on the monitoring of biological responses to exogenous administrations have been proposed as more sensitive methods to identify treated animals. This study has, for the first time, profiled plasma proteome responses in bovine animals to treatment with nortestosterone decanoate and 17β-oestradiol benzoate, followed by dexamethasone administration. Two-dimensional fluorescence differential in-gel electrophoresis analysis revealed a series of hepatic and acute-phase proteins within plasma whose levels were up- or down-regulated within phases of the treatment regime. Surface plasmon resonance (SPR) immuno-assays were developed to quantify responses of identified protein markers during the experimental treatment study with a view to developing methods which can be used as screening tools for growth promoter abuse detection. SPR analysis demonstrated the potential for plasma proteins to be used as indicative measures of growth promoter administrations and concludes that the sensitivity and robustness of any detection approach based on plasma proteome analysis would benefit from examination of a range of proteins representative of diverse biological processes rather being reliant on specific individual markers.     

Development of surface plasmon resonance-based sensor for detection of silver nanoparticles in food and the environment

Silver nanoparticles are recognized as effective antimicrobial agents and have been implemented in various consumer products including washing machines, refrigerators, clothing, medical devices, and food packaging. Alongside the silver nanoparticles benefits, their novel properties have raised concerns about possible adverse effects on biological systems. To protect consumer's health and the environment, efficient monitoring of silver nanoparticles needs to be established. Here, we present the development of human metallothionein (MT) based surface plasmon resonance (SPR) sensor for rapid detection of nanosilver. Incorporation of human metallothionein 1A to the sensor surface enables screening for potentially biologically active silver nanoparticles at parts per billion sensitivity. Other protein ligands were also tested for binding capacity of the nanosilver and were found to be inferior to the metallothionein. The biosensor has been characterized in terms of selectivity and sensitivity towards different types of silver nanoparticles and applied in measurements of real-life samples-such as fresh vegetables and river water. Our findings suggest that human MT1-based SPR sensor has the potential to be utilized as a routine screening method for silver nanoparticles, that can provide rapid and automated analysis dedicated to environmental and food safety monitoring.     

A chip-based miniaturized format for protein-expression profiling: the exploitation of comprehensively produced antibodies

Numerous antibodies have been developed and validated in recent years, and show promise for use in novel functional protein assays. Such assays would be an alternative to pre-existing comprehensive assays, such as DNA microarrays. Antibody microarrays are thought to represent those functional protein assays. While a variety of attempts have been made to apply DNA microarray technology to antibody microarrays, a fully optimized protocol has not been established. We have been conducting a project to comprehensively produce antibodies against mouse KIAA ("KI" stands for "Kazusa DNA Research Institute" and "AA" are reference characters) proteins. Using our library of antibodies, we established a novel antibody microarray format that utilizes surface plasmon resonance (SPR) technology. A label-free real-time measurement of protein expression in crude cell lysates was achieved by direct readout of the bindings using SPR. Further refinement of the antibody microarray format enabled us to detect a smaller quantity of target proteins in the lysate without the bulk effect. In this review, we first summarize available antibody array formats and then describe the above-mentioned format utilizing updated SPR technology.     

Single-crystal sapphire-fiber optic sensors based on surface plasmon resonance spectroscopy for in situ monitoring

Single-crystal sapphire-fiber optic sensors based on surface plasmon resonance (SPR) for refractive index (RI) measurements of aqueous and hydrothermal water solutions are described. Accurate measurement of RIs is essential to efficient operation and control of broad range of engineering processes. Some of these processes are carried out with harsh environments, such as high-temperature, high pressure, and chemical corrosion. These extreme physical conditions are proving a limiting factor in application of the conventional silica-based optical sensors. Single-crystal sapphire is an ideal material for sensor applications, where reliable performance is required in the extreme environment conditions. With regard to the liquid species detection, most applications of SPR sensors are designed to function near the refractive index of water (1.3330 RI). The RI changes of aqueous solution can be easily monitored by silica-fiber (RI, 1.4601 at 550 nm) based SPR sensor. However, the sapphire waveguide has a prohibitively high RI (1.7708 at 546 nm) for unmodified monitoring of the RI changes of aqueous solutions. For that purpose, a practical SPR probe geometry has been applied to the ability to tune the SPR coupling wavelength/angle pair with sapphire-fiber based SPR probe.     

表面增强拉曼光谱技术在食品检测中的应用研究进展

食品污染是危害公众健康和安全的重要问题,探究灵敏、快速、简单的技术,以便在痕量水平上检测污染物,对保障食品质量安全和风险评价具有十分重要的意义.表面增强拉曼光谱(SERS)是利用光与金、银等纳米结构材料相互作用产生很强的表面等离子激元共振效应,可显著增强吸附在纳米结构表面上分子的拉曼信号,以超灵敏获取样品自身或拉曼探针...