Tethered catalytic hairpin assembly with plasmon-enhanced fluorescence readout for single molecule detection

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F25%3A00635540" target="_blank" >RIV/68378271:_____/25:00635540 - isvavai.cz</a>

Result on the web

<a href="https://hdl.handle.net/11104/0366600" target="_blank" >https://hdl.handle.net/11104/0366600</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/smtd.202500037" target="_blank" >10.1002/smtd.202500037</a>

Result language

angličtina

Original language name

Tethered catalytic hairpin assembly with plasmon-enhanced fluorescence readout for single molecule detection

Original language description

Here a novel digital bioassay readout concept is reported that does not rely on enzymatic amplification nor compartmenting of an analyzed liquid sample. Rather, it is based on counting individual affinity-captured target biomolecules via the use of a tethered catalytic hairpin assembly (tCHA) deployed on a solid sensor surface with spatial confinement utilized by a flexible polymer linker (FPL). Wide-field plasmon-enhanced fluorescence (PEF) imaging is employed for optical real-time probing of the reaction kinetics, where affinity-captured target molecules are manifested as spatially distinct bright fluorescent spots. The effect of the length of the FPLs is investigated, and the analytical performance of the dual amplification tCHA-PEF concept is tested by using a model short single-stranded DNA analyte. When applied in a sandwich immunoassay, the detection of target proteins at sub-femtomolar concentrations is demonstrated. The reported experiments are supported by diffusion-limited mass transfer models and document the potential of tCHA-PEF as a new class of generic enzyme-free bioanalytical tools enabling the ultrasensitive analysis of trace amounts of protein and nucleic acid analytes, making it attractive for future molecular diagnostics and research applications.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10306 - Optics (including laser optics and quantum optics)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Small Methods

ISSN

2366-9608

e-ISSN

2366-9608

Volume of the periodical

9

Issue of the periodical within the volume

8

Country of publishing house

US - UNITED STATES

Number of pages

12

Pages from-to

2500037

UT code for WoS article

001462698900001

EID of the result in the Scopus database

2-s2.0-105002307879