Because highly luminescent lanthanide compounds are limited to Eu3+ and Tb3+ compounds with red (Eu, ~615 nm) and green (Tb, ~545 nm) emission colors, the development and application of time-resolved luminescence bioassay technique using lanthanide-based multicolor luminescent biolabels have rarely been investigated. In this work, a series of lanthanide complexes covalently bound silica nanoparticles with an excitation maximum wavelength at 335 nm and red, orange, yellow and green emission colors has been prepared by co-binding different molar ratios of luminescent Eu3+–Tb3+ complexes with a ligand N,N,N1,N1-(4′-phenyl-2,2′:6′,2′′-terpyridine-6,6′′-diyl)bis(methylenenitrilo) tetrakis (acetic acid) inside the silica nanoparticles. The nanoparticles characterized by transmission electron microscopy and luminescence spectroscopy methods were used for streptavidin labeling, and time-resolved fluoroimmunoassay (TR-FIA) of human prostate-specific antigen (PSA) as well as time-resolved luminescence imaging detection of an environmental pathogen, Giardia lamblia. The results demonstrated the utility of the new multicolor luminescent lanthanide nanoparticles for time-resolved luminescence bioassays.
由于高发光
镧系化合物仅限于红色(Eu,约 615 nm )和绿色(Tb,约 545 nm )发射色的 Eu3+ 和 Tb3+ 复合物,因此利用
镧系多色发光
生物标签进行时间分辨发光
生物测定技术的开发和应用还鲜有研究。本研究通过将不同摩尔比的发光 Eu3+-Tb3+ 复合物与
配体 N,N,N1,N1-(4′-苯基-2,2′:6′,2′′-terpyridine-6,6′′-diyl)bis(methylenitrilo) tetrakis (acetic acid)
配体。利用透射电子显微镜和发光光谱方法对纳米颗粒进行了表征,并将其用于
链霉亲和素标记、人类前列腺特异性抗原(P
SA)的时间分辨荧光免疫测定(TR-FIA)以及环境病原体贾第虫的时间分辨发光成像检测。研究结果表明,这种新型多色发光
镧系元素纳米粒子可用于时间分辨发光
生物测定。