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Magnetic-controlled non-competitive enzyme-linked voltammetric immunoassay for carcinoembryonic antigen

Paper ID Volume ID Publish Year Pages File Format Full-Text
4625 235 2008 9 PDF Available
Title
Magnetic-controlled non-competitive enzyme-linked voltammetric immunoassay for carcinoembryonic antigen
Abstract

A new flow-through voltammetric immunoassay protocol based on a novel transparent immunoaffinity reactor for the detection of carcinoembryonic antigen (CEA) was proposed. To construct such an affinity reactor, the reactor was initially fabricated by means of immobilization HRP-labeled anti-CEA antibody (HRP-anti-CEA)-functionalized magnetic CoFe2O4 nanoparticles (bionanoparticles) on a home-made carbon paste electrode (CPE) with an external magnet. With a non-competitive immunoassay format, the as-prepared bionanoparticles were incubated with the analyte CEA, and the formed antigen–antibody complex inhibited partly the active center of the immobilized HRP, which decreased the HRP towards H2O2 reduction. Under optimized conditions, the decrease in current response was proportional to the CEA concentration in the range of 1.5–60 ng/ml with a detection limit of 0.5 ng/ml (at 3δ). The flow-injection immunoassay system could automatically control the incubation, washing and measurement steps with acceptable reproducibility and good stability. Moreover, the proposed immunosensors were used to analyze CEA in human serum specimens. Analytical results of clinical samples show the developed immunosensor has a promising alternative approach for detecting CEA in the clinical diagnosis.

Keywords
Carcinoembryonic antigen; Magnetic nanoparticles; Voltammetric immunosensor
First Page Preview
Magnetic-controlled non-competitive enzyme-linked voltammetric immunoassay for carcinoembryonic antigen
Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 39, Issue 2, 15 April 2008, Pages 267–275
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering