4.7 Article

Carbon nanospheres enhanced electrochemiluminescence of CdS quantum dots for biosensing of hypoxanthine

期刊

TALANTA
卷 85, 期 4, 页码 2154-2158

出版社

ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2011.07.059

关键词

Biosensors; Electrochemiluminescence; Quantum dots; Carbon nanospheres; Hypoxanthine

资金

  1. National Natural Science Foundation of China [20821063, 20875044, 21075060]

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This work developed a novel method to greatly enhance the electrochemiluminescence (ECL) of CdS quantum dots (QDs). The ECL amplification was achieved by the assembly of QDs on poly (diallyldimethylammonium chloride)-functionalized carbon nanospheres (PFCNSs), and successfully employed for sensitive ECL biosensing of oxidase substrates. The carbon nanospheres were prepared by a green method, and the high loading of QDs on carbon nanospheres led to a 4-times increased ECL intensity with dissolved O-2 as the coreactant. Using xanthine oxidase (XOD) as a model, an ECL biosensor was fabricated by immobilizing the enzyme on the mixing membrane of PFCNSs and QDs. The ECL biosensor showed a fast response to hypoxanthine with a linear concentration range from 2.5 X 10(-8) to 1.4 X 10(-5) M. The limit of detection was 5 nM at a signal-to-noise ratio of 3. The assay results of hypoxanthine in fish samples were in a good agreement with the reference values by amperometric technique. This facile approach to prepare the PFCNSs/QDs system for ECL biosensing could be of promising application in bioanalysis and electronic device. (C) 2011 Elsevier B.V. All rights reserved.

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