期刊
MICROCHIMICA ACTA
卷 185, 期 10, 页码 -出版社
SPRINGER WIEN
DOI: 10.1007/s00604-018-2986-0
关键词
Lactalbumin amperometric assay; Hydrogen evolution reaction; Magnetic beads; Ferrocene modified gold nanoparticles
资金
- Ministry of High Education and Scientific research
The authors describe a method for electrochemical determination of the breast cancer biomarker a-lactalbumin (alpha-LA) using disposable screen-printed carbon electrodes (SPCEs). Lysozyme-conjugated Fe3O4 nanoparticles (Lys-Fe(3)O(4)NPs) were used to capture alpha-LA on the surface of the SPCEs which then is trapped in an immunosandwich using secondary antibodies labeled with ferrocene-modified gold nanoparticles. The amperometric response of ferrocene (recorded at + 0.1 V vs. silver pseudo-reference electrode) as well as the electrocatalytic activity of gold nanoparticles on the hydrogen evolution reaction (recorded at -1.0 V Vs Ag pseudo-reference electrode) was exploited to sense a-LA. A sensitive voltammetric response is observed, with (a) a sensitivity of 0.8789 mu A. nM(-1). cm(-2), (b) a detection limit (LOD, at S/N = 3) as low as 0.07 ng . mL(-1), and (c) linear response in the 0.75 to 630 ng mL(-1) alpha-LA concentration range. The assay is selective and reproducible, and the SPCEs have good storage stability. The SPCEs were applied (a) to the analysis of (spiked) maternal milk, (b) of spiked serumfrom healthy and pregnant persons, and (c) of serum of patients suffering from breast cancer.
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