期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 243, 期 -, 页码 121-129出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.11.135
关键词
Electrochemiluminescent immunosensor; CdSe QDs; Au nanoparticles; PDDA-graphene; Ractopamine
资金
- Science Fund from the National Natural Science Foundation of China [21075087, 21175097]
- Project of Scientific and Technologic Infrastructure of Suzhou [SZS201207]
- Priority Academic Program Development of Jiangsu Higher Education Institution [YX10900212]
In this work, gold nanoparticals (AuNPs) and CdSe QDs decorated poly (diallyldimethylamrnonium chloride)-graphene (CdSe QDs/PDDA-GN/AuNPs) were prepared and applied as probe to assemble an electrochemiluminescence (ECL) immunosensor for detecting ractopamine (RAC) for the first time. The CdSe QDs/PDDA-GN/AuNPs composite showed good electronic conductivity, fast response and satisfactory stability which employed for fabricating ECL biosensors with high sensitivity. AuNPs and PDDA-GN were creatively applied in this sensor not only accelerate electron conduction to achieve dual signal amplification, but also provide large surface for coating antigen and antibody loading. A competitive immunoassay strategy was chosen for determining RAC, where RAC in the sample would compete with the coating antigen for the limited biomarkers. The well-prepared ECL immunosensor satisfied in samples detection of RAC with a wider linear range from 0.01 to 1000 ngmL(-1) and a lower detection limit of 2.6 pg mL(-1) (S/N =3). The proposed ECL immunosensor displayed high sensitivity and stability, and provided an approach for determining other important biomarkers. (C) 2016 Elsevier B.V. All rights reserved.
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