Please use this identifier to cite or link to this item: https://doi.org/10.1021/la100139p
Title: Anionic conjugated polymer with aptamer-functionalized silica nanoparticle for label-free naked-eye detection of lysozyme in protein mixtures
Authors: Wang, Y.
Pu, K.-Y. 
Liu, B. 
Issue Date: 15-Jun-2010
Source: Wang, Y., Pu, K.-Y., Liu, B. (2010-06-15). Anionic conjugated polymer with aptamer-functionalized silica nanoparticle for label-free naked-eye detection of lysozyme in protein mixtures. Langmuir 26 (12) : 10025-10030. ScholarBank@NUS Repository. https://doi.org/10.1021/la100139p
Abstract: An assay triggered by recognition-induced charge switching is developed for protein detection and quantification. Aptamer-functionalized silica nanoparticles (NPs) have been synthesized to capture lysozyme, resulting in an alternation of the surface charge from negative to partially positive. The binding event is then translated and monitored by the fluorescence signal of a highly fluorescent anionic poly(fluorene-alt-vinylene) (PFVSO3), which "stains" on protein/aptamer-NP complexes via electrostatic interaction. Blue-greenish fluorescence of PFVSO3 is observed in the presence of lysozyme by the naked eye, while no fluorescence is obtained for NPs upon treatment with a mixture of foreign proteins. A linear relationship between NP fluorescence and lysozyme is observed in the concentration range of 0-22.5 μg/mL, which gives a limit of detection as ∼0.36 μg/mL. This work demonstrates a convenient label-free conjugated polyelectrolyte (CPE)-based protein detection with high specificity and sensitivity, which has potential applications in medical diagnosis. © 2010 American Chemical Society.
Source Title: Langmuir
URI: http://scholarbank.nus.edu.sg/handle/10635/88543
ISSN: 07437463
DOI: 10.1021/la100139p
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