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采用沉淀聚合的方法以乙醇/水为混合溶剂、K_2S_2O_8/NaHSO_3为引发剂,室温下引发苯乙烯聚合制备了单分散的聚苯乙烯(PS)微球.研究了反应时间、引发剂用量、反应溶剂中乙醇与水的比例、搅拌速度对聚苯乙烯微球的收率及形貌、单体转化率的影响.结果表明,聚苯乙烯微球的单体转化率、微球的收率和粒径随着反应时间的延长而增加,反应12 h后趋于稳定;当增加引发剂的用量,聚苯乙烯微球的单体转化率、微球的收率和粒径都有所增加,K_2S_2O_8与Na HSO_3用量分别在≤2.0%和1.3%时,能够得到单分散的聚苯乙烯微球;随着反应介质中水含量的增加,聚苯乙烯微球的单体转化率、微球的收率先增加后降低,单分散性变差,水含量在≤40%能够得到单分散的微球;搅拌速度从600 r/min增加到1200 r/min时,微球粒径、收率与单体转化率几乎没有变化.并初步研究了聚苯乙烯微球的形成机理. 相似文献
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本文以羧基96孔板为分离载体,核酸适配体作为分子特异性识别元件,聚苯乙烯微球作为放大载体,辣根过氧化物酶为标记物,构建了化学发光(CL)高灵敏度凝血酶检测新技术.实验结果表明:该放大技术不但灵敏度高,且抗干扰能力强,其他蛋白质如IgG、IgM、IgA、IgE、IFN均无明显干扰.聚苯乙烯微球放大体系中凝血酶的线性范围为7.8~250pmol/L,最低检测浓度可达3.9pmol/L;而不放大检测技术的线性范围为0.94~30nmol/L,最低检测浓度为0.46nmol/L,放大体系将检测灵敏度提高100多倍.综合而言,基于适配体识别和聚苯乙烯微球放大的凝血酶CL检测新技术具有通量大、简单快速和灵敏度高的特点,有望在凝血酶高通量检测领域获得应用. 相似文献
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制备了一种可定性定量检测水溶液中三价铁离子的含铕聚苯乙烯微球, 分别用固体核磁碳谱(13C CP/MAS NMR)、 傅里叶变换红外光谱(FTIR)、 X射线光电子能谱(XPS)、 扫描电子显微镜(SEM)、 透射电子显微镜(TEM)、 元素分析、 粒度分析和ζ电位分析等对其化学组成和结构形貌进行表征. 当铕配合物单体用量低于2.5%时, 可以得到稳定的单分散键合型含铕聚苯乙烯微球. 用紫外光激发时, 该含铕聚苯乙烯微球发射铕离子的特征红光. Fe3+能猝灭该微球的荧光, 酸根离子和其它金属离子对其干扰较少; 猝灭效率与Fe3+浓度在0~300 μmol/L浓度范围内均呈线性关系; 随着铕配合物单体用量的增加, 微球的荧光增强, 其在检测Fe3+的荧光时, 猝灭常数(KSV)增加, 检测限(LOD)下降. 调节铕配合物单体的用量, 可获得热性能优异、 红光发射强度高且稳定性好的单分散聚苯乙烯荧光微球, 对Fe3+荧光检测显示出较高的选择性, 在生物检测和环境保护等领域具有较高的应用价值. 相似文献
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两种磁性复合微球的制备及其性能对比 总被引:1,自引:1,他引:1
为了得到蛋白吸附性能良好的免疫磁性载体,文章用反相微乳的方法合成了壳聚糖磁性复合微球(Chitosanmagneticcompositemicrospheres简称CMCM),与常用的单体聚合法制备的聚苯乙烯磁性复合微球(Polystyrenemagneticcompositemicrospheres,简称PMCM)从粒径和表观形貌、微球铁含量、磁响应性、表面官能基团等性质做了对比表征,结果表明,CMCM是一种比PMCM更理想的免疫磁性微球载体材料。 相似文献
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两步后交联法制备氯甲基化聚苯乙烯交联微球 总被引:2,自引:0,他引:2
以平均粒径为40μm的非交联氯甲基化聚苯乙烯(CMPS)微球为出发物料,采用水解-轻度交联与重度交联两步骤的后交联方法,制备了氯甲基化聚苯乙烯交联微球.用红外光谱表征了交联前后微球化学结构的变化,使用扫描电镜观察了交联微球的形貌,重,点考察了各种交联条件对微球交联度的影响规律,分析了交联反应机理.结果表明:先将非交联氯甲基化聚苯乙烯微球部分水解并轻度交联,然后使CMPS微球在良溶剂中溶胀,使用Friedel-Crafts催化剂,再度进行交联反应,可顺利地制得氯甲基化聚苯乙烯(CCMPS)交联微球;控制交联反应的条件,如反应温度、反应时间、溶剂性质、催化剂种类与用量等,可获得交联度不同的微球,其球形度依然保持良好. 相似文献
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负载高密度乙肝检测探针磁珠的制备及性能 总被引:1,自引:0,他引:1
本文介绍了一种负载高密度乙肝检测探针磁珠的制备技术,并对其在乙肝检测中的应用性能进行了研究,开辟了一种乙肝检测的新方法。首先通过化学键连接的方法制备出表面偶联乙肝抗体的磁性复合微球(亦称“乙肝抗原检测免疫磁珠”),之后将其用于乙肝检测研究表现出了较好的效果,为了进一步提高其检测准确性及灵敏性,对乙肝免疫磁珠的制备过程进行了优化,包括磁珠的胺化工艺及抗体的偶联工艺。通过优化得到氨基磁性复合微球的氨基含量为2.71 mmol/g、单位磁珠抗体偶联量为108.36 ug/mg、偶联效率为77.40%的负载高密度乙肝检测探针的磁珠。并在此过程中采用类“双抗原夹心酶联免疫法”对乙肝抗体的活性及优化效果进行了检测。通过性能检测比较,磁珠法检测灵敏度高于普通酶联免疫法。 相似文献
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Macroporous poly(vinyl acetate-co-triallyl isocyanurate)beads were prepared with suspension polymerization method.The copolymer beads were then transformed into poly(vinyl alcohol-co-triallyl isocyanurate)by ester exchange reaction.Aminocarboxylic acids were immobilized on the copolymer beads by the esterification of hydroxyl groups with diethyl-lenetriaminepentaacetic bisanhydride,The weak acid exchange capacities,specific surface areas and mean pore diameters of the rsultant resin beads were measured. 相似文献
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Immunoassay using probe-labelling immunogold nanoparticles with silver staining enhancement via surface-enhanced Raman scattering 总被引:6,自引:0,他引:6
This paper reports a novel immunoassay based on surface-enhanced Raman scattering (SERS) and immunogold labelling with silver staining enhancement. Immunoreactions between immunogold colloids modified by a Raman-active probe molecule (e.g., 4-mercaptobenzoic acid) and antigens, which were captured by antibody-assembled chips such as silicon or quartz, were detected via SERS signals of Raman-active probe molecule. All the self-assembled steps were subjected to the measurements of ultraviolet-visible (UV-vis) spectra to monitor the formation of a sandwich structure onto a substrate. The immunoassay was performed by a sandwich structure consisting of three layers. The first layer was composed of immobilized antibody molecules of mouse polyclonal antibody against Hepatitis B virus surface antigen (PAb) on a silicon or quartz substrate. The second layer was the complementary Hepatitis B virus surface antigen (Antigen) molecules captured by PAb on the substrate. The third layer was composed of the probe-labelling immunogold nanoparticles, which were modified by mouse monoclonal antibody against Hepatitis B virus surface antigen (MAb) and 4-mercaptobenzoic acid (MBA) as the Raman-active probe on the surface of gold colloids. After silver staining enhancement, the antigen is identified by a SERS spectrum of MBA. A working curve of the intensity of a SERS signal at 1585 cm(-1) due to the [small nu](8a) aromatic ring vibration of MBA versus the concentration of analyte (Antigen) was obtained and the non-optimized detection limit for the Hepatitis B virus surface antigen was found to be as low as 0.5 [micro sign]g mL(-1). 相似文献
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基于简立方格点模型,对纳米粒子/共聚物混合体系进行了动力学Monte Carlo模拟研究. 每一共聚物链均由一个A珠子和三个B珠子组成,表示为A1B3. A1B3链的两亲性体现为B-B之间的相互吸引作用,同时憎水性的纳米粒子之间也存在相互吸引. 通过适当选取纳米粒子与B珠子之间的吸引作用势,观察到两种结构:纳米粒子/A1B3链的核-壳结构和纳米粒子分散在憎水壳层中的A1B3囊泡结构. 还研究了这两种结构的动力学演化过程,模拟结果表明在纳米粒子分散于囊泡壳层的过程中A1B3囊泡起模板作用. 相似文献
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A sensitive sandwich immunoassay for the determination of Hepatitis B surface antigen (HBs) was developed, using a cascade system of Limulus amebocyte lysate as a signal amplification system. Lipopolysaccharide (LPS) was conjugated to anti-HBs antibody. Anti-HBs antibody was adsorbed to polystyrene beads. First, HBs were reacted to solid phase anti-HBs antibody (a-HBs). After the reaction, the beads were rinsed, and were then reacted with a-HBs-LPS. Then, LPS activity specifically bound to the beads was measured. HBs could be measured in the range of 10(-10)-10(-12) g/mL. 相似文献
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《Radiation Physics and Chemistry》2007,76(10):1569-1576
Poly(isobutyl methacrylate) (PiBMA) microspheres with a 800- to 1500-μm diameter range synthesized by suspension polymerization technique were used as the trunk polymer in the preparation of a highly efficient new adsorbent. Glycidyl methacrylate (GMA) was grafted onto the trunk polymer by pre-irradiation grafting technique. Grafting conditions were optimized, and GMA grafted PiBMA beads were modified with iminodiacetonitrile (IDAN) in ethanol at 80 °C. The nitrile groups were then amidoximated by using 6% (m/v) hydroxylamine hydrochloride in methanol solution. The IDAN modification and the conversion of the nitrile groups to amidoxime were followed by FT-IR spectroscopy. The surface morphology and thermal behavior of the PiBMA and its modificated forms were also characterized by scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) techniques further confirming modification and amidoximation. 相似文献
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Yu Han GUO Tian Sheng SU* Center for Molecule Science Institute of Chemistry The Chinese Academy of Sciences Beijing 《中国化学快报》2001,(1)
The cross-linked polymer beads with reactive groups as active supports have been widely used in many fields such as chromatographic separation, solid phase synthesis, catalytic reaction, ion exchange and adsorption etc. In resent years, the synthesis and application of monodisperse polymer beads with different structures have been rapidly developed1~4. It is obvious that this type of monosized resin as matrix of active supports will be even more advantageous in some applications. This paper pr… 相似文献
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表面修饰的钛酸钡纳米粉体的制备 总被引:1,自引:0,他引:1
采用水热法制备出表面包裹有硬脂酸的钛酸钡纳米粉体,并运用一系列手段对其微结构进行了表征.结果表明:产物粒径较小,粒度分布较窄,单分散性较好,其表面为非极性,同时表现出良好的流动性能.认为钛酸钡纳米粉体表面极性的改变是由于其表面包裹了一层硬脂酸,并且包裹层降低了粉体间的相互作用力,从而提高了粉体的流动性. 相似文献