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Biosens Bioelectron. 2018 May 30;106:50-56. doi: 10.1016/j.bios.2018.01.059. Epub 2018 Jan 31.

Ru(bpy)32+-Silica@Poly-L-lysine-Au as labels for electrochemiluminescence lysozyme aptasensor based on 3D graphene.

Author information

1
Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Key Laboratory of Guangxi Colleges and Universities for food safety and pharmaceutical analytical chemistry, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530008, PR China.
2
Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Key Laboratory of Guangxi Colleges and Universities for food safety and pharmaceutical analytical chemistry, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530008, PR China. Electronic address: gxunxctan@126.com.
3
Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Key Laboratory of Guangxi Colleges and Universities for food safety and pharmaceutical analytical chemistry, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530008, PR China; State Key Laboratory of Agricultural Microbiology, College of Science, College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China.

Abstract

In this work, the feasibility of a novel sensitive electrochemiluminescence aptasensor for the detection of lysozyme using Ru(bpy)32+-Silica@Poly-L-lysine-Au (RuSiNPs@PLL-Au) nanocomposites labeling as an indicator was demonstrated. The substrate electrode of the aptasensor was prepared by depositing gold nanoparticles (AuNPs) on 3D graphene-modified electrode. The lysozyme binding aptamer (LBA) was attached to the 3D graphene/AuNPs electrode through gold-thiol affinity, hybridized with a complementary single-strand DNA (CDNA) of the lysozyme aptamer labeled by RuSiNPs@PLL-Au as an electrochemiluminescence intensity amplifier. Thanks to the synergistic amplification of the 3D graphene, the AuNPs and RuSiNPs@PLL-Au NPs linked to Ru(bpy)32+-ECL further enhanced the ECL intensity of the aptasensor. In presence of lysozyme, the CDNA segment of the self-assembled duplex was displaced by the lysozyme, resulting in decreased electrochemiluminescence signal. Under the optimized conditions, the decrease in electrochemiluminescence intensity varied proportionally with the logarithmic concentration of the lysozyme from 2.25 × 10-12 to 5.0 × 10-8 mol L-1, and the detection limit was estimated to 7.5 × 10-13 mol L-1. The aptasensor was further tested in real samples and found reliable for the detection of lysozyme, thus holding great potential application in food safety researches and bioassay analysis.

KEYWORDS:

3D graphene; Electrochemiluminescence aptasensor; Lysozyme; Ru(bpy)(3)(2+)-Silica@Poly-L-lysine-Au

PMID:
29414088
DOI:
10.1016/j.bios.2018.01.059
[Indexed for MEDLINE]

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