A novel label-free electrochemical immunosensor based on functionalized nitrogen-doped graphene quantum dots for carcinoembryonic antigen detection

作者：Yang, Yuying; Liu, Qing^*; Liu, Yan; Cui, Jianjian; Liu, Hui; Wang, Ping; Li, Yueyun; Chen, Lei; Zhao, Zengdian; Dong, Yunhui^*

来源：Biosensors and Bioelectronics, 2017, 90: 31-38.

DOI：10.1016/j.bios.2016.11.029

• Carcinoembryonic antigen
• Au nanoparticles
• PtPd bimetallic nanoparticles
• Nitrogen-doped graphene quantum dots
• Label-free
• Electrochemical immunosensor

A novel and ultrasensitive label-free electrochemical immunosensor was fabricated for quantitative detection of carcino-embryonic antigen (CEA). The nitrogen-doped graphene quantum dots (N-GQDs) supported PtPd bimetallic nanoparticles (PtPd/N-GQDs) were synthesized by a simple and green hydrothermal procedure. Subsequently, PtPd/N-GQDs functionalized Au nanoparticles (PtPd/N-GQDs@Au) were prepared successfully via a self-assembly approach. Because of the synergetic effect present in PtPd/N-GQDs@Au, this novel nanocomposites has shown excellent electrocatalytic activity towards hydrogen peroxide (H2O2) reduction. Featuring good biocompatibility, excellent conductivity and large surface area, PtPd/N-GQDs@Au was applied as transducing materials to efficiently conjugate capture antibodies and amplify electrochemical signal. Under the optimal conditions, the proposed immunosensor was used for the detection of CEA with wide dynamic range in the range from 5 fg/mL to 50 ng/mL with a low detection limit of 2 fg/mL (S/N=3). Furthermore, this label free immunosensor possesses high sensitivity, special selectivity and long-term stability, which shows promising application in bioassay analysis.

• 出版日期2017-4-15
• 单位山东理工大学