A novel photoelectrochemical immunosensor by integration of nanobody and ZnO nanorods for sensitive detection of nucleoside diphosphatase kinase-A

作者：Liu, Anran^*; Yin, Kaifei; Mi, Li; Ma, Mengyao; Liu, Yuanjian; Li, Ying; Wei, Wei; Zhang, Yuanjian; Liu, Songqin

来源：Analytica Chimica Acta, 2017, 973: 82-90.

DOI：10.1016/j.aca.2017.03.048

• ZnO nanorod
• Photoelectrochemical immunosensor
• Nanobody
• NDPK-A

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 Mn-2 broken vertical bar 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 mg mL(-1). The R-2 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.

• 出版日期2017-6-22
• 单位东南大学