A novel photoelectrochemical immunosensor by integration of nanobody and ZnO nanorods for sensitive detection of nucleoside diphosphatase kinase-A.
Anal Chim Acta
; 973: 82-90, 2017 Jun 22.
Article
em En
| MEDLINE
| ID: mdl-28502431
ABSTRACT
Nucleoside diphosphatase kinase A (NDPK-A) is a metastasis-suppressor protein and a biomarker that act on a wide range cancer cells to inhibit the potential metastasis. Herein, we present a simple photoelectrochemical immunosensor based on ZnO nanorod arrays for the sensitive detection of NDPK-A. The ZnO nanorod arrays cosensitized with CdS nanoparticles and Mn2+ displayed a high and stable photocurrent response under irradiation. After anti-NPDK-A nanobodies were immobilized to the ZnO nanorod arrays, the proposed immunosensor can be utilized for detecting NPDK-A by monitoring the changes in the photocurrent signals of the electrode resulting from immunoreaction. Accordingly, the well-designed immunosensor exhibited a low limit of detection (LOD) of 0.3 pg mL-1 and a wide linear range from 0.5 pg mL-1 to 10 µg mL-1. The R2 of the regression curve is 0.99782. Meanwhile, the good stability, reproducibility and specificity of the resulting photoelectrochemical biosensor are demonstrated. In addition, the presented work would offer a novel and simple approach for the detection of immunoreactions and provide new insights in popularizing the diagnosis of NPDK-A.
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MEDLINE
Assunto principal:
Óxido de Zinco
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Técnicas Biossensoriais
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Nanotubos
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Nucleosídeo NM23 Difosfato Quinases
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Técnicas Eletroquímicas
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article