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Evaluating Quantum Dot Performance in Homogeneous FRET Immunoassays for Prostate Specific Antigen

The integration of semiconductor quantum dots (QDs) into homogeneous Förster resonance energy transfer (FRET) immunoassay kits for clinical diagnostics can provide significant advantages concerning multiplexing and sensitivity. Here we present a facile and functional QD-antibody conjugation method u...

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Autores principales: Bhuckory, Shashi, Lefebvre, Olivier, Qiu, Xue, Wegner, Karl David, Hildebrandt, Niko
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4801574/
https://www.ncbi.nlm.nih.gov/pubmed/26861327
http://dx.doi.org/10.3390/s16020197
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author Bhuckory, Shashi
Lefebvre, Olivier
Qiu, Xue
Wegner, Karl David
Hildebrandt, Niko
author_facet Bhuckory, Shashi
Lefebvre, Olivier
Qiu, Xue
Wegner, Karl David
Hildebrandt, Niko
author_sort Bhuckory, Shashi
collection PubMed
description The integration of semiconductor quantum dots (QDs) into homogeneous Förster resonance energy transfer (FRET) immunoassay kits for clinical diagnostics can provide significant advantages concerning multiplexing and sensitivity. Here we present a facile and functional QD-antibody conjugation method using three commercially available QDs with different photoluminescence (PL) maxima (605 nm, 655 nm, and 705 nm). The QD-antibody conjugates were successfully applied for FRET immunoassays against prostate specific antigen (PSA) in 50 µL serum samples using Lumi4-Tb (Tb) antibody conjugates as FRET donors and time-gated PL detection on a KRYPTOR clinical plate reader. Förster distance and Tb donor background PL were directly related to the analytical sensitivity for PSA, which resulted in the lowest limits of detection for Tb-QD705 (2 ng/mL), followed by Tb-QD655 (4 ng/mL), and Tb-QD605 (23 ng/mL). Duplexed PSA detection using the Tb-QD655 and Tb-QD705 FRET-pairs demonstrated the multiplexing ability of our immunoassays. Our results show that FRET based on QD acceptors is suitable for multiplexed and sensitive biomarker detection in clinical diagnostics.
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spelling pubmed-48015742016-03-25 Evaluating Quantum Dot Performance in Homogeneous FRET Immunoassays for Prostate Specific Antigen Bhuckory, Shashi Lefebvre, Olivier Qiu, Xue Wegner, Karl David Hildebrandt, Niko Sensors (Basel) Article The integration of semiconductor quantum dots (QDs) into homogeneous Förster resonance energy transfer (FRET) immunoassay kits for clinical diagnostics can provide significant advantages concerning multiplexing and sensitivity. Here we present a facile and functional QD-antibody conjugation method using three commercially available QDs with different photoluminescence (PL) maxima (605 nm, 655 nm, and 705 nm). The QD-antibody conjugates were successfully applied for FRET immunoassays against prostate specific antigen (PSA) in 50 µL serum samples using Lumi4-Tb (Tb) antibody conjugates as FRET donors and time-gated PL detection on a KRYPTOR clinical plate reader. Förster distance and Tb donor background PL were directly related to the analytical sensitivity for PSA, which resulted in the lowest limits of detection for Tb-QD705 (2 ng/mL), followed by Tb-QD655 (4 ng/mL), and Tb-QD605 (23 ng/mL). Duplexed PSA detection using the Tb-QD655 and Tb-QD705 FRET-pairs demonstrated the multiplexing ability of our immunoassays. Our results show that FRET based on QD acceptors is suitable for multiplexed and sensitive biomarker detection in clinical diagnostics. MDPI 2016-02-04 /pmc/articles/PMC4801574/ /pubmed/26861327 http://dx.doi.org/10.3390/s16020197 Text en © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Bhuckory, Shashi
Lefebvre, Olivier
Qiu, Xue
Wegner, Karl David
Hildebrandt, Niko
Evaluating Quantum Dot Performance in Homogeneous FRET Immunoassays for Prostate Specific Antigen
title Evaluating Quantum Dot Performance in Homogeneous FRET Immunoassays for Prostate Specific Antigen
title_full Evaluating Quantum Dot Performance in Homogeneous FRET Immunoassays for Prostate Specific Antigen
title_fullStr Evaluating Quantum Dot Performance in Homogeneous FRET Immunoassays for Prostate Specific Antigen
title_full_unstemmed Evaluating Quantum Dot Performance in Homogeneous FRET Immunoassays for Prostate Specific Antigen
title_short Evaluating Quantum Dot Performance in Homogeneous FRET Immunoassays for Prostate Specific Antigen
title_sort evaluating quantum dot performance in homogeneous fret immunoassays for prostate specific antigen
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4801574/
https://www.ncbi.nlm.nih.gov/pubmed/26861327
http://dx.doi.org/10.3390/s16020197
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