Europium chelate (BHHCT-Eu3+) and its metal nanostructure enhanced luminescence applied to bioassays and time-gated bioimaging

Wei Deng, Dayong Jin, Krystyna Drozdowicz-Tomsia, Jingli Yuan, Ewa M. Goldys

Research output: Contribution to journalArticleResearchpeer-review

Abstract

We report the use of europium chelate, 4,4′-bis(1″,1″, 1″,2″,2″,3″,3″-heptafluoro-4″, 6″-hexanedion-6″-yl)chlorosulfo-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 11 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.

LanguageEnglish
Pages10036-10043
Number of pages8
JournalLangmuir
Volume26
Issue number12
DOIs
Publication statusPublished - 15 Jun 2010

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Europium
bioassay
Nanostructures
Bioassay
europium
Luminescence
chelates
Biological Assay
Metals
luminescence
beads
metals
augmentation
Silver
Luminance
brightness
silver
Giardia lamblia
biotin
terphenyls

Cite this

Deng, Wei ; Jin, Dayong ; Drozdowicz-Tomsia, Krystyna ; Yuan, Jingli ; Goldys, Ewa M. / Europium chelate (BHHCT-Eu3+) and its metal nanostructure enhanced luminescence applied to bioassays and time-gated bioimaging. In: Langmuir. 2010 ; Vol. 26, No. 12. pp. 10036-10043.
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Europium chelate (BHHCT-Eu3+) and its metal nanostructure enhanced luminescence applied to bioassays and time-gated bioimaging. / Deng, Wei; Jin, Dayong; Drozdowicz-Tomsia, Krystyna; Yuan, Jingli; Goldys, Ewa M.

In: Langmuir, Vol. 26, No. 12, 15.06.2010, p. 10036-10043.

Research output: Contribution to journalArticleResearchpeer-review

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