Add time:09/08/2019         Source:sciencedirect.com

In this paper, sensitive detections on Abrin (cas 1393-62-0) are demonstrated in real-time by piezoresistive (PZR) cantilever sensors. With attempts to optimize the design and fabrication of the PZR cantilevers, the voltage fluctuation of the PZR sensors was decreased to 1 μV and the signal to noise ratio (SNR) was increased significantly. By using the biotin–streptavidin functionalized cantilevers, sensitive detections on abrin were realized. A linear relation between the concentration of abrin and the output voltage of PZR sensors was established within the range of 0.08–40 ng/mL (1.2–600 pM) and a limit of detection (LOD) of 80 pg/mL (1.2 pM) was obtained in PBS buffer. Meanwhile, detections on orange juice and skim milk samples spiked with abrin were also performed, and the detection sensitivity decreased by 6–17% compared with the one in PBS buffer at the same concentrations. At last, a model of pseudo-first-order kinetics was used to analyze the interaction mechanism of abrin and biotinylated polyclone antibody (bio-PcAb) against abrin, which was consistent with the detection results. The proposed PZR cantilever sensors provide an economical platform for on-site detections of food contaminants with the advantages of high SNR, portability, and rapid response.

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