等离子磁性微球的制备及其蛋白检测分析

液态芯片技术以其多元同时检测的优势在生物分析领域得到了广泛的应用。然而,相比其他接近单分子检测灵敏度的生物分析检测技术,液态芯片技术的灵敏度还有待进一步提高。本研究以等离子磁性微球取代液态芯片技术中传统的微球,构建了具有荧光增强特性的新型液态芯片检测平台。研究表明,本文制备的等离子磁性荧光微球可以实现对特定荧光分子达到70倍的荧光增强效应,构建的新型液态芯片检测平台对蛋白类肿瘤标志物的检测灵敏度也可以提高2个数量级,为传统液态芯片技术检测灵敏度的提高提供了方法学借鉴。

银纳米晶掺杂玻璃基片对Er^(3+)/Yb^(3+)共掺碲酸盐薄膜的荧光增强及其数值模拟

采用电场辅助热扩散工艺制备了银纳米晶掺杂玻璃基片,用非水解溶胶—凝胶法在基片上制备了Er3+/Yb3+共掺碲酸盐薄膜,研究结果表明,玻璃基片中的银纳米颗粒对Er3+/Yb3+共掺碲酸盐薄膜具有明显的荧光增强效果.利用菲克第一、第二定律、欧姆定律、泊松方程对电场辅助热扩散过程进行了数值模拟,计算了玻璃内银的浓度分布.结果表明:玻璃内银纳米颗粒的总量越大、近玻璃表面银纳米颗粒的浓度和粒度越大、银耗尽层的厚度越小,荧光增强效果越好.此外,不仅近玻璃表面的银纳米颗粒可以产生荧光增强效应,而且远离表面的银纳米颗粒也有荧光增强效应.

Fluorescence enhancement of Tb^(3+) complexes by adding silica-coated silver nanoparticles

Six kinds of terbium ternary complexes with halo-benzoic acids were synthesized. Their compositions were determined by C, H elemental analyzer and EDTA titration. The infrared spectra, ultraviolet absorption spectra, and fluorescence spectra were also measured to identify the complexes. Elemental analysis showed that the compositions of these complexes were Tb（p-BrBA）3- H20, Tb（p-CIBA）3- 2H20, Tb（p-FBA）3- H20, Tb（o-FBA）3·2H20, Tb（o-CIBA）3· H20, and Tb（o-BrBA）3. H20, respectively. The monodispersed Ag@SiO2 core-shell nanoparticles with silica thicknesses of 10, 15, and 25 nm were success- fully prepared and characterized by transmission-electron microscopy. Fluorescence intensities of the complexes were detected before and after Ag@SiO2core-shell nanoparticles were added; the enhancement times were related to the silica-shell thick- ness. The fluorescence enhancement times were largest when the thickness of the silica shell was 25 nm. The mechanism may be attributed to the localized surface-plasmon resonance. Furthermore, the enhancement effect of terbium fluoro-benzoate complexes was the strongest in these complexes. This result may be attributed to the hydrogen bond between the hydroxyl on the surface of the silica shell and the fluorine atom.