CHEN Pei-yao,XIE Lin-hui,XIE Yang,GONG Ting,LUO Ying-ping.A Label-free Fluorescent Aptasensor Based on Competitive Displacement of Thioflavin T for Rapid Detection of Hepatotoxic Senecionine[J].Journal of Instrumental Analysis,2026,45(06):1-7.
CHEN Pei-yao,XIE Lin-hui,XIE Yang,GONG Ting,LUO Ying-ping.A Label-free Fluorescent Aptasensor Based on Competitive Displacement of Thioflavin T for Rapid Detection of Hepatotoxic Senecionine[J].Journal of Instrumental Analysis,2026,45(06):1-7. DOI: 10.12452/j.fxcsxb.26020602.
A Label-free Fluorescent Aptasensor Based on Competitive Displacement of Thioflavin T for Rapid Detection of Hepatotoxic Senecionine
The rapid detection of hepatotoxic senecionine(SEN) is crucial for food safety and public health. In this study,a novel,label-free fluorescent aptasensor was developed based on a previously selected SEN-specific DNA aptamer. The core design principle relied on the strong fluorescence signal generated by the specific binding between thioflavin T(ThT) and the aptamer. In the presence of the target,SEN competitively displaced ThT from the ThT-aptamer complex,resulting in a significant fluorescence decrease(“signal-off”mode). The demonstrated sensor exhibited excellent screening capability for SEN,with a detection limit as low as 40 nmol/L,and samples could be directly o
bserved under blue light irradiation. The snesor demonstrateed high specificity. In actual honey samples,the method still maintained a good linear response(0-10 μmol/L,
r
²=0.98),with a detection limit of 414 nmol/L. Spiked recovertes ranged from 99.2% to103%,and the relative standard deviation was below 3.0%,confirming its accuracy and reliability in complex matrices. This study presents a new method for SEN detection with high sensitivity,strong specificity,and simple operation,offering a promising technological platform for the on-site rapid screening of pyrrolizidine alkaloid biotoxins in food and herbal medicines.
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