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A FRET-based dual-color evanescent wave optical fiber aptasensor for simultaneous fluorometric determination of aflatoxin M1 and ochratoxin A

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Abstract

A dual-color fluorescence resonance energy transfer (FRET) based aptasensor is described for simultaneous determination of the mycotoxins aflatoxin M1 (AFM1) and ochratoxin A (OTA). Aptamers against AFM1 and OTA were labeled with two fluorophores with different excitation wavelengths (Cy5.5; 675 nm; and Alexa 405; 401 nm), respectively. They were used as the signalling probes. A compact dual-color evanescent wave all-fiber detection system with two lasers (635 nm; red; and 405 nm; purple) was used for the simultaneous collection of two-wavelength fluorescence signals. The hybridization of labeled aptamers with complementary sequences (Q-cDNA) labeled with a dark quencher (BHQ3 or dabcyl) causes fluorescence to be strongly reduced because of the fluorescence resonance energy transfer. In the presence of AFM1 and OTA, they bind to their respective aptamer and result in the dissociation of double stranded DNA, which induce fluorescence recovery. Under the optimum conditions, AFM1 and OTA can simultaneously and selectively be determined ranged from 1 ng·L−1 to 1 mg·L−1. The detection limits of AFM1 and OTA are 21 and 330 ng·L−1, respectively (S/N = 3). The FRET-based dual-color detection scheme was applied to the simultaneous detection of AFM1 and OTA in milk with good recovery, precision, and accuracy.

Aptamers against AFM1 and OTA were labeled with two fluorophores with different excitation wavelengths (Cy5.5; 675 nm; and Alexa 405; 401 nm) and then used as signalling probes. A FRET-based aptasensor is described for simultaneous determination of AFM1 and OTA using dual-color evanescent wave system with two lasers (635 nm; red; and 405 nm).

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Acknowledgements

This research was financially supported by the National Natural Science Foundation of China (21675171, 21277173), the National Instrument Major Project of China (2012YQ3011105), the Fundamental Research Funds for the Central Universities, and the Research Funds of Renmin University of China (15XNLD04).

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  1. School of Environment and Natural Resource, Renmin University of China, Beijing, 100872, China

    Dan Song, Rong Yang, Shunyan Fang, Yanping Liu & Feng Long

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  1. Dan Song
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  3. Shunyan Fang
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Correspondence to Dan Song or Feng Long.

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Song, D., Yang, R., Fang, S. et al. A FRET-based dual-color evanescent wave optical fiber aptasensor for simultaneous fluorometric determination of aflatoxin M1 and ochratoxin A. Microchim Acta 185, 508 (2018). https://doi.org/10.1007/s00604-018-3046-5

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