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Label-Free Electrochemical Immunosensor for the Determination of Fetoprotein Based on Core-Shell-Shell Nanocomposite Particles

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A new approach toward the development of advanced immunosensors based on chemically functionalized coreshell- shell magnetic nanocomposite particles, and the preparation, characteristics, and measurement of relevant properties of the immunosensor useful for the detection of α-1-fetoprotein (AFP) in clinical immunoassays. The core-shell NiFe2O4/3-aminopropyltriethoxysilance (APTES) ([email protected]) was initially prepared by covalent conjugation, then gold nanoparticles were adsorbed onto the surface of [email protected], and then anti-AFP molecules were conjugated on the gold nanoparticles. The core-shell-shell nanocomposite particles not only had the properties of magnetic nanoparticles, but also provided a good biocompatibility for the immobilization of biomolecules. The core-shell-shell nanostructure present good magnetic properties to facilitate and modulate the way it was integrated into a carbon paste. The analytical performance of the immunosensor was investigated by using an electrochemical method. Under optimal conditions, the resulting composite presents good electrochemical response for the detection of AFP, and exhibits wide linear range from 0.9 to 110 ng/mL AFP with a detection limit of 0.5 ng/mL. Moreover, the proposed immunosensors were used to analyze AFP in human serum specimens. Analytical results, obtained for the clinical serum specimen by the developed immunosensor, were in accordance with those assayed by the standard ELISA. Importantly, the proposed immunoassay system could be further developed for the immobilization of other antigens or biocompounds.

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Keywords: Core-shell-shell magnetic nanocomposite particles; label-free; potentiometric immunosensor; α-1-fetoprotein

Document Type: Research Article

Publication date: 01 August 2008

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  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.
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