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Biomolecule-functionalized magnetic nanoparticles for flow-through quartz crystal microbalance immunoassay of aflatoxin B1

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Abstract

A flow-through quartz crystal microbalance (QCM) immunoassay method has been developed based on aflatoxin B1 antibody (anti-AFB1)-functionalized magnetic core-shell Fe3O4/SiO2 composite nanoparticles (bionanoparticles) in this study. To construct such an assay protocol, anti-AFB1, as a model protein, was initially covalently immobilized onto the Fe3O4/SiO2 surface, and then the functionalized nanoparticles were attached to the surface of the QCM probe with an external magnet. The binding of target molecules onto the immobilized antibodies decreased the sensor’s resonant frequency, and the frequency shift was proportional to the AFB1 concentration in the range of 0.3–7.0 ng/ml. The regeneration of the developed immunosensor was carried out via attaching or detaching the external magnet from the detection cell. In addition, the selectivity, reproducibility, and stability of the proposed immunoassay system were acceptable. Compared with the conventional ELISAs, the proposed immunoassay system was simple and rapid without multiple labeling and separation steps. Importantly, the proposed immunoassay method could be further developed for the immobilization of other antigens or biocompounds.

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Acknowledgements

This work is supported by the Specialized Research Funds for the Excellent Young Teachers from Yibin University, China. The authors gratefully acknowledge the financial support from Postgraduate Science and Technology Innovation Program of YBU, and NSF of Sichuan, China.

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Yibin University, Yibin, 644000, People’s Republic of China

    Li Wang & Xian-Xue Gan

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  1. Li Wang
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  2. Xian-Xue Gan
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Correspondence to Li Wang.

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Wang, L., Gan, XX. Biomolecule-functionalized magnetic nanoparticles for flow-through quartz crystal microbalance immunoassay of aflatoxin B1 . Bioprocess Biosyst Eng 32, 109–116 (2009). https://doi.org/10.1007/s00449-008-0228-2

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