Title: A simple double-bead sandwich assay for protein detection in serum using UV-vis spectroscopy
Authors: Jans, Hilde ×
Jans, Karolien
Demeyer, Pieter-Jan
Knez, Karel
Stakenborg, Tim
Maes, Guido
Lagae, Liesbet #
Issue Date: Feb-2011
Publisher: Elsevier BV
Series Title: Talanta vol:83 issue:5 pages:1580-1585
Abstract: In this study a double-bead sandwich assay, employing magnetic nanoparticles and gold nanoparticles is proposed. The magnetic nanoparticles allow specific capturing of the analyte in biological samples, while the optical properties of the gold nanoparticles provide the signal transduction. We demonstrated that a major improvement in the assay sensitivity was obtained by selecting an optimal gold nanoparticle size (60 nm). A detection limit of 5-8 ng/mL, a sensitivity of 0.6-0.8 (pg/mL)(-1) and a dynamic range of 3 orders of magnitude were achieved without any further amplification using the detection of prostate specific antigen in serum as a model system. The proposed assay has the ability to be easily implemented within a microfluidic device for point-of-care applications whereby the readout can be executed by a fast and cheap optical measurement. (C) 2010 Elsevier B.V. All rights reserved.
ISSN: 0039-9140
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
Molecular Imaging and Photonics
Division of Mechatronics, Biostatistics and Sensors (MeBioS)
× corresponding author
# (joint) last author

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