Please use this identifier to cite or link to this item: https://doi.org/10.1021/la901703p
Title: Conjugated polyelectrolyte-sensitized fluorescent detection of thrombin in blood serum using aptamer-immobilized silica nanoparticles as the platform
Authors: Wang, Y.
Liu, B. 
Issue Date: 3-Nov-2009
Citation: Wang, Y., Liu, B. (2009-11-03). Conjugated polyelectrolyte-sensitized fluorescent detection of thrombin in blood serum using aptamer-immobilized silica nanoparticles as the platform. Langmuir 25 (21) : 12787-12793. ScholarBank@NUS Repository. https://doi.org/10.1021/la901703p
Abstract: The detection of disease-related proteins in complex biological media demands sensitive, reliable, and low-cost sensing methods. We present here an assay with aptamer-functionalized silica nanoparticles (NPs) as the sensory platform for thrombin detection in blood serum. As a result of specific protein/aptamer interaction, the presence of thrombin induces the primary aptamer-functionalized NPs to form a sandwich structure with fluorescein-labeled secondary aptamer and results in fluorescent NPs. A conjugated polyelectrolyte is further added to the NP solution to amplify the fluorescent signal. The assay shows high specificity for thrombin detection in serum. In addition, a detection limit of 1.06 nM is obtained, which is significantly improved as compared to that for many fluorescence-based thrombin detection assays. Using lysozyme as a second example, the NP-based detection strategy is shown to be generic and could be readily applicable to the detection of other proteins in practical samples. © 2009 American Chemical Society.
Source Title: Langmuir
URI: http://scholarbank.nus.edu.sg/handle/10635/63645
ISSN: 07437463
DOI: 10.1021/la901703p
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