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@proceedings{1422597, author = {Farka, Zdeněk and Mickert, Matthias Jürgen and Hlaváček, Antonín and Skládal, Petr and Gorris, HansandHeiner}, booktitle = {Biosensors 2018 - 28th Anniversary World Congress on Biosensors}, keywords = {single-molecule analysis; upconversion-linked immunosorbent assay; cancer biomarker; prostate specific antigen; photon-upconversion nanoparticle}, language = {eng}, title = {Single-molecule upconversion-linked digital immunosensing of cancer biomarkers}, year = {2018} }
TY - CONF ID - 1422597 AU - Farka, Zdeněk - Mickert, Matthias Jürgen - Hlaváček, Antonín - Skládal, Petr - Gorris, Hans-Heiner PY - 2018 TI - Single-molecule upconversion-linked digital immunosensing of cancer biomarkers KW - single-molecule analysis KW - upconversion-linked immunosorbent assay KW - cancer biomarker KW - prostate specific antigen KW - photon-upconversion nanoparticle N2 - The ability to detect cancer biomarkers at the single-molecule level promises the ultimate sensitivity in clinical diagnosis. Fluorescence-based single-molecule analysis, however, is limited by matrix interferences, and therefore is typically not suitable for real world analytical applications. This optical background can be elegantly avoided by using photon-upconversion nanoparticles (UCNPs) that emit shorter-wavelength light under near-infrared (NIR) excitation (anti-Stokes emission). Conjugates of UCNPs with antibody can be used as a background-free luminescent tracer in upconversion-linked immunosensing. We have developed an optical approach for visualizing individual UCNPs by conventional epiluminescence microscopy and applied it for the sensitive detection of the cancer biomarker prostate specific antigen (PSA). Individual sandwich immunocomplexes consisting of (1) immobilized anti-PSA antibody, (2) PSA, and (3) anti-PSA antibody-UCNP conjugate were counted under an upconversion wide-field microscope equipped with a 980 nm laser excitation source. The noise-surpassing digital readout provided single particle resolution with almost no instrumental background. This allowed to reach a limit of detection (LOD) of 1.2 pg mL−1 (42 fM) of PSA in 25 % blood serum which is about ten times more sensitive than a classical (analog) readout of luminescence intensity. ER -
FARKA, Zdeněk, Matthias Jürgen MICKERT, Antonín HLAVÁČEK, Petr SKLÁDAL and Hans-Heiner GORRIS. Single-molecule upconversion-linked digital immunosensing of cancer biomarkers. In \textit{Biosensors 2018 - 28th Anniversary World Congress on Biosensors}. 2018.
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