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Europium(III) modified silicone nanoparticles for ultrasensitive visual determination of tetracyclines by employing a fluorescence color switch

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Abstract

Silicon nanoparticles (SiNPs) modified with Eu(III) were synthesized and are shown to be a viable ratiometric fluorescent probe for tetracycline antibiotics. SiNPs/Eu under 405 nm excitation display two emissions, viz. a strong cyan colored fluorescence peaking at 497 nm and a weak pink fluorescence peaking at 622 nm. On addition of tetracyclines (chlortetracycline, tetracycline, doxycycline), the fluorescence at 497 nm is reduced, while the one at 622 nm is increased. Thus, the visible color of fluorescence changes from cyan to pink. This was exploited to design ratiometric fluorometric method for detecting tetracyclines. The method has a limit of detection that is lower by a factor of about 1000 when compared to the use of SiNPs only. A test paper was prepared with the SiNPs/Eu and then applied for the visual semi-quantitative detection of tetracyclines. With the addition of tetracyclines, the test paper exhibited a dosage-sensitive color conversion from cyan to pink with a visually discernible scale as low as 0.4 μM.

Tetracyclines decrease the fluorescence at 497 nm of europium (III) modified silicon nanoparticles (SiNPs/Eu) due to the inner filter effect and increase the one at 622 nm due to an antenna effect. Thus the fluorescence color of SiNPs/Eu changes from cyan to pink. Based on this color switch, a ultrasensitive and visual determination strategy for tetracyclines is proposed.

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Acknowledgements

The work was supported by the National Natural Science Foundation of China (Nos. 21575043, 21275056, 21605052, 51478196); and the Platform Construction Project of Guangzhou Science Technology and Innovation Commission (No. 15180001).

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  1. Ying Yu

    Present address: School of Chemistry and Environment, Guangzhou Key Laboratory of Analytical Chemistry for Biomedicine, South China Normal University, No. 378 Waihuan West Road, University City, Guangzhou, Guangdong, 510006, People’s Republic of China

Authors and Affiliations

  1. School of Chemistry and Environment, Guangzhou Key Laboratory of Analytical Chemistry for Biomedicine, South China Normal University, No. 378 Waihuan West Road, University City, Guangzhou, Guangdong, 510006, People’s Republic of China

    Bixia Lin, Tingyun Zhang, Xiaolan Xin, Duo Wu, Yan Huang, Yawen Liu, Yujuan Cao & Manli Guo

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Lin, B., Zhang, T., Xin, X. et al. Europium(III) modified silicone nanoparticles for ultrasensitive visual determination of tetracyclines by employing a fluorescence color switch. Microchim Acta 186, 442 (2019). https://doi.org/10.1007/s00604-019-3557-8

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