Abstract
We describe a fast and sensitive method for the detection of aflatoxin B2 (AFB2) that is based on the addition of AFB2-sensitive aptamers to a colloidal solution of gold nanoparticles (AuNPs). Subsequent addition of AFB2 and NaCl to the solution causes a color change from wine-red to blue-purple. Best results are obtained at a pH value of 7.0, a 10 mM aptamer concentration, and a 2 M concentration of NaCl. The method has a linear dynamic range that extends from 0.025 to 10 ng∙mL−1 of AFB2, and the detection limit is 25 pg∙mL−1. The method is simple, fast, highly sensitive, and enables both visual and microplate readout.
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Acknowledgment
The authors express heartfelt thanks to Professor Ai-Liang Chen from the Chinese Academy of Agricultural Sciences. This research was supported by the National Science Foundation of China (Grant No. 41,301,350), the Innovation and Capacity-building Projects by the Beijing Academy of Agriculture and Forestry Sciences (project KJCX20140302), the Open Project of Beijing Research Center for Agricultural Standards and Testing (ATFM-KFKT2013003), and the National High Technology Research and Development Program of China (863 Program No. 2012AA101609). The authors express their gratitude for the support.
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Luan, Y., Chen, J., Xie, G. et al. Visual and microplate detection of aflatoxin B2 based on NaCl-induced aggregation of aptamer-modified gold nanoparticles. Microchim Acta 182, 995–1001 (2015). https://doi.org/10.1007/s00604-014-1420-5
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DOI: https://doi.org/10.1007/s00604-014-1420-5