论文名称：Europium Chelate (BHHCT-Eu3+) and Its Metal Nanostructure Enhanced Luminescence Applied to Bioassays and Time-Gated Bioimaging
论文类型：期刊论文
发表刊物：LANGMUIR
收录刊物：SCIE、EI
卷号：26
期号：12
页面范围：10036-10043
ISSN号：0743-7463
摘要：We report the use of europium chelate, 4,4'-bis(1 '',1 '',1 '',2 '',2 '',3 '',3 ''-heptafluoro-4 '',6 ''-hexanedion-6 ''-yl)chloro-sulfo-o-terphenyl-Eu3+ (BHHCT-Eu3+), in silver nanostructure-enhanced luminescence and its application to bioassays and bioimaging. The highest luminescence intensity enhancement factor of BHHCT-Eu3+ achieved in this study was about II times, while the simultaneously measured luminescence lifetime was reduced 2-fold. The luminophore photostability was also improved by a factor of 3. On the basis of these experimental results, we estimated the impact of silver nanostructures on the excitation and emission enhancement factors. Luminescence enhancement was demonstrated in two geometries: on planar glass substrates and on silica beads. In the biotin-modified IgG antibody assay the bead geometry provided slightly higher enhancement factor and greater sensitivity. Subsequently, we applied such bead substrates to time-gated luminescence imaging of Giardia lamblia cells stained by BHHCT-Eu3+ where we observed improved brightness by a factor of 2. Such improved photostability and brightness of BHHCT-Eu3+ in the presence of metal nanostructures are highly desirable for ultrasensitive bioassays and bioimaging, especially with time gating.
发表时间：2010-06-15