Multichannel electroanalytical devices for competitive ELISA of phenylethanolamine A

- Multichannel electroanalytical devices were constructed for immunoassay.
- The devices avoided the contamination of reagents with counter and reference electrodes.
- The approach was applied to detect phenylethanolamine A in competitive ELISA.
- The assay showed excellent sensitivity, selectivity, reproducibility and stability.

Herein, we reported a disposable electroanalytical device for competitive enzyme-linked immunosorbent assay (ELISA) of phenylethanolamine A (PA). Conductive carbon tape coated with gold cluster served as the working electrode, while the counter and reference electrodes were fabricated on the filter paper by the screen-printing technique. Separating fabrication of the working electrode from other electrodes could make it possible for full utilization of the working electrode modification in bulk and no contamination of the immune-reagents on the counter and reference electrodes. The gold cluster played an important role in both immobilizing antigen and accelerating electron transfer. The eight-channel devices were utilized to detect PA on the strategy of competitive ELISA. The detection range and the limit of detection (LOD) using differential pulse voltammetry for PA were 0.005-60 ng mL−1 and 2.6 pg mL−1, respectively. And also, the linear range for PA performed by square wave voltammetry was 0.05-60 ng mL−1 with the LOD value as 0.028 ng mL−1. The results clearly demonstrated that the proposed electroanalytical devices could be successfully applied in immunoassay and might be further developed for determination of different analytes based on ELISA format.