Corresponding Author

Shi-ping SONG(songshiping@sinap.ac.cn)


We have developed a multi-channel electrochemical immunosensing system for the detection of α-fetoprotein (AFP). The sensing system consisted of carbon screen-printed electrode (SPCE) arrays and polyHRP-based signal amplification probes. AFP antigens could bind to both capture antibodies immobilized on electrode arrays ant detection antibodies (anti-AFP IgG developed in rabbit). The anti-rabbit IgG conjugated to poly-horseradish peroxidase were used as a signaling probe to bind to the immuno-complex. The current signals were harvested by a home-made multi-channels electrochemical detector. AFP could be detected in the concentration ranges of 64 pg·mL-1 ~ 250 ng·mL-1. The detection limit was as low as 56 pg·mL-1. The proposed immunosensing system provided a high sensitive, specific, simple and practical method for AFP detection.

Graphical Abstract


multi-channel carbon screen-printed electrode, electrochemical immunosensing system, α-fetoprotein

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