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A point-of-care aptasensor based on the upconversion nanoparticles/MoS2 FRET system for the detection of Pseudomonas aeruginosa infection

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Abstract

The rapid detection of Pseudomonas aeruginosa (P. aeruginosa) is of great significance for the diagnosis of medical infection. In view of the above, a novel aptasensor based on fluorescence resonance energy transfer (FRET) was developed. It contained aptamer-coupled upconversion nanoparticles (UCNPs-apt) as a donor (excitation 980 nm) and molybdenum disulfide (MoS2) nanosheets as an acceptor. The upconversion fluorescence aptamer system was investigated to obtain the optimal parameters of MoS2 concentration, the incubation time of UCNPs-apt/MoS2 and P. aeruginosa, and pH. Based on the optimal parameters, a linear calibration equation (emission 654 nm) with a wide detection range 8.7 × 10 ~ 8.7 × 107 cfu/mL, a high coefficient of determination R2 0.9941, and a low limit of determination (LOD) 15.5 cfu/mL were established. The method was validated with P. aeruginosa infected foci of mouse wound. The advantage of this aptasensor is that analysis results can be obtained  within 1.5 h, which was much faster than that of the standard method (18–24 h). Furthermore, combined with a portable instrument, it can be used as a point-of-care testing for the early detection of P. aeruginosa infection, which is useful for selecting the correct antibiotics to achieve good therapeutic effects. Additionally, it also has a broad application prospect in food and environmental areas.

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Funding

This work was supported by the earmarked fund, China [grant number CARS-18] and Jiangsu Postgraduate Innovation Program Project [grant number SJCX23_2238].

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  1. School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212100, China

    Dou Che, Xitao Cao, Chong Chen & Hui Yan

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  1. Dou Che
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  2. Xitao Cao
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Che, D., Cao, X., Chen, C. et al. A point-of-care aptasensor based on the upconversion nanoparticles/MoS2 FRET system for the detection of Pseudomonas aeruginosa infection. Microchim Acta 191, 61 (2024). https://doi.org/10.1007/s00604-023-06155-6

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