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Liquid crystal 5CB-loaded nanogold as new nanocatalyst combined with aptamer to determine small organic pollutants by Cu2O resonance Rayleigh scattering probe

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Abstract

A new, highly catalysis and stable liquid crystal 5CB-loaded nanogold (Au/5CB) nanosol was prepared through template method and was characterized in details. It was found that Au/5CB can strongly catalyze the new indicator reaction of fructose-Cu(II) tartrate complex to generate Cu2O cube particles (CPs) with high resonance Rayleigh scattering effect. Combined the nanocatalytic amplification indicator reaction with the label-free aptamer (Apt) reaction, a new RRS aptasensing platform was developed to detect 0.05–1.0 ng mL−1 oxytetracycline (OTC) and the limit of detection was 0.02 ng mL−1. The developed RRS aptasensing platform can be also utilized to detect 7.5–60 ng mL−1 malathion and 1–3.5 ng mL−1 tetracyclines. Finally, the nanocatalytic reaction mechanism was studied.

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Abbreviations

RRS:

Resonance Rayleigh scattering

SPR:

Surface Plasmon Resonance

Apt:

Aptamer

R 2 :

R-Squared, correlation coefficient

5CB:

4-Cyano-4'-pentylbiphenyl

AuNPs:

Au nanoparticles

Au/5CB:

5CB liquid crystal-loaded AuNPs

I:

Intensity

FR:

Fructose

TEC:

Tetracycline

MAL:

Malathion

OTC:

Oxytetracycline

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No.21767004).

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Correspondence to Zhi-Liang Jiang.

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Huang, HB., Weng, GQ., Liang, AH. et al. Liquid crystal 5CB-loaded nanogold as new nanocatalyst combined with aptamer to determine small organic pollutants by Cu2O resonance Rayleigh scattering probe. Chem. Pap. 77, 141–149 (2023). https://doi.org/10.1007/s11696-022-02456-x

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  • DOI: https://doi.org/10.1007/s11696-022-02456-x

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