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. 2021 Oct 1:189:113373.
doi: 10.1016/j.bios.2021.113373. Epub 2021 May 30.

Label-free photoelectrochemical immunosensor for aflatoxin B1 detection based on the Z-scheme heterojunction of g-C3N4/Au/WO3

Fubin Pei  1 , Shasha Feng  2 , Yi Wu  2 , Xuchu Lv  2 , Hualai Wang  2 , Shen-Ming Chen  3 , Qingli Hao  2 , Yang Cao  2 , Wu Lei  4 , Zhaoyang Tong  5
Affiliations

Label-free photoelectrochemical immunosensor for aflatoxin B1 detection based on the Z-scheme heterojunction of g-C3N4/Au/WO3

Fubin Pei et al. Biosens Bioelectron. .

Abstract

Aflatoxin B1 (AFB1) is the most toxic mycotoxin, is widely found in foods and animal feeds, and can pose a serious threat to our lives. A label-free photoelectrochemical (PEC) immunosensor was fabricated for the sensitive detection of AFB1. A Z-scheme heterojunction of gold nanoparticles (Au NPs) loaded on graphitic carbon nitride sheet and tungsten trioxide sphere composite (g-C3N4/Au/WO3) acted as the highly sensitive platform. The g-C3N4/Au/WO3 is capable, not only of immobilizing antibodies via Au NPs, but also enhancing the separation of electron-hole pairs due to its good energy band matching efficiency. The mechanism of photo-generated electron/hole transfer on g-C3N4/Au/WO3 was explored using scavengers to eliminate active components. On this basis, an electron transfer pathway for the immunosensor was deduced. The PEC immunosensor displayed a linear concentration range from 1.0 pg mL-1 to 100 ng mL-1 and a low detection limit of 0.33 pg mL-1 (S/N = 3) for AFB1. Good reproducibility, stability, and specificity provide a solid foundation for the practical application of this immunosensor.

Keywords: Aflatoxin B1; Photoelectrochemical immunosensor; Z-scheme heterojunction; g-C(3)N(4)/Au/WO(3).

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