Abstract
On the basis of aptamer (Apt) with hairpin structure and fluorescence resonance energy transfer (FRET), a ratio fluorescent aptamer homogeneous sensor was prepared for the determination of Aflatoxin B1 (AFB1). Initially, the Apt labeled simultaneously with Cy5, BHQ2, and cDNA labeled with Cy3 were formed a double-stranded DNA through complementary base pairing. The fluorescence signal of Cy3 and Cy5 were restored and quenched respectively. Thus, the ratio change of FCy3 to FCy5 was used to realized the detection of AFB1 with wider detection range and lower limit of detection (LOD). The response of the optimized protocol for AFB1 detection was wider linear range from 0.05 ng/mL to 100 ng/mL and the LOD was 12.6 pg/mL. The sensor designed in this strategy has the advantages of simple preparation and fast signal response. It has been used for the detection of AFB1 in labeled corn and wine, and has good potential for application in real samples.
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Funding
This study was funded by the Key Scientific and Technological Project of Henan Province (212102310001), Science Foundation of Henan University of Technology (31401425) and Innovative Funds Plan of Henan University of Technology(2021ZKCJ13).
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Beibei Feng: concept design, editing, Review modification, editing, and analysis data. Jing You: formal analysis, writing-original draft. Fei Zhao: performed the experiments and modification. Min Wei: corresponding author, concept design, review writing and editing. Yong Liu: contributed reagents, materials. Kun Yuan: writing-review and editing. Zhiguang Suo: review modification, editing, and analyzed and interpreted the data.
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Feng, B., You, J., Zhao, F. et al. A ratiometric fluorescent aptamer homogeneous biosensor based on hairpin structure aptamer for AFB1 detection. J Fluoresc 32, 1695–1701 (2022). https://doi.org/10.1007/s10895-022-02972-9
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DOI: https://doi.org/10.1007/s10895-022-02972-9