Journal
TALANTA
Volume 114, Issue -, Pages 43-48Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2013.04.017
Keywords
Ag nanoparticles-polydopamine@graphene nanocomposite; Adenine; Guanine; Electrochemical sensor; Voltammetry; Biosensing
Categories
Funding
- National Natural Science Foundation of China [21075106]
- Program for Science & Technology Innovation Talents in Universities of Henan Province [2010HASTIT025]
- Excellent Youth Foundation of Henan Scientific Committee [104100510020]
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A multifunctional Ag nanoparticles (AgNPs)-polydopamine (Pdop)@graphene (Gr) composite was prepared by a simple and mild procedure. Gr was easily coated with Pdop at room temperature and then AgNPs was deposited by mildly stirring. The nanocomposite was characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM). Guanine and adenine as model moleculars were employed to study their electrochemical responses at the Ag-Pdop@Gr composite modified electrode, which showed more favorable electron transfer kinetics than Gr modified glassy carbon and AgNPs modified glassy carbon electrodes. The Ag-Pdop@Gr modified electrode exhibited linear ranges of 0.04-50 mu M and 0.02-40 mu M with detection limits of 4.0 nM and 2.0 nM for guanine and adenine, respectively. The developed method was applied for simultaneous determination of trace-level adenine and guanine in fish sperm. The results demonstrated that the AgNPs-Pdop@Gr nanocomposite was a promising substrate for the development of high-performance electrocatalysts for biosensing. (C) 2013 Elsevier B.V. All rights reserved.
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