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Fluorescence Bar-Co...
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Sandberg, ElinKTH,Kvant- och biofotonik,Albanova University Center, 106 91 Stockholm, Sweden
(författare)
Fluorescence Bar-Coding and Flowmetry Based on Dark State Transitions in Fluorescence Emitters
- Artikel/kapitelEngelska2024
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American Chemical Society (ACS),2024
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LIBRIS-ID:oai:DiVA.org:kth-342739
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-342739URI
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https://doi.org/10.1021/acs.jpcb.3c06905DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
Anmärkningar
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QC 20240206
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Reversible dark state transitions in fluorophores represent a limiting factor in fluorescence-based ultrasensitive spectroscopy, are a necessary basis for fluorescence-based super-resolution imaging, but may also offer additional, largely orthogonal fluorescence-based readout parameters. In this work, we analyzed the blinking kinetics of Cyanine5 (Cy5) as a bar-coding feature distinguishing Cy5 from rhodamine fluorophores having largely overlapping emission spectra. First, fluorescence correlation spectroscopy (FCS) solution measurements on mixtures of free fluorophores and fluorophore-labeled small unilamellar vesicles (SUVs) showed that Cy5 could be readily distinguished from the rhodamines by its reversible, largely excitation-driven trans-cis isomerization. This was next confirmed by transient state (TRAST) spectroscopy measurements, determining the fluorophore dark state kinetics in a more robust manner, from how the time-averaged fluorescence intensity varies upon modulation of the applied excitation light. TRAST was then combined with wide-field imaging of live cells, whereby Cy5 and rhodamine fluorophores could be distinguished on a whole cell level as well as in spatially resolved, multiplexed images of the cells. Finally, we established a microfluidic TRAST concept and showed how different mixtures of free Cy5 and rhodamine fluorophores and corresponding fluorophore-labeled SUVs could be distinguished on-the-fly when passing through a microfluidic channel. In contrast to FCS, TRAST does not rely on single-molecule detection conditions or a high time resolution and is thus broadly applicable to different biological samples. Therefore, we expect that the bar-coding concept presented in this work can offer an additional useful strategy for fluorescence-based multiplexing that can be implemented on a broad range of both stationary and moving samples.
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Demirbay, BarisKTH,Kvant- och biofotonik,Albanova University Center, 106 91 Stockholm, Sweden(Swepub:kth)u10bas52
(författare)
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Kulkarni, AbhilashKTH,Tillämpad fysik,Albanova University Center, 106 91 Stockholm, Sweden(Swepub:kth)u1wrw20i
(författare)
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Liu, HaichunKTH,Kvant- och biofotonik,Albanova University Center, 106 91 Stockholm, Sweden(Swepub:kth)u1mn5cz0
(författare)
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Piguet, Joachim,1979-KTH,Kvant- och biofotonik,Albanova University Center, 106 91 Stockholm, Sweden(Swepub:kth)u1s3pwbd
(författare)
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Widengren, JerkerKTH,Kvant- och biofotonik,Albanova University Center, 106 91 Stockholm, Sweden(Swepub:kth)u1i3g09c
(författare)
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KTHKvant- och biofotonik
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Journal of Physical Chemistry B: American Chemical Society (ACS)128:1, s. 125-1361520-61061520-5207
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