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Photoelectrochemical aptasensor for thrombin based on Au-rGO-CuS as signal amplification elements

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Abstract

A photoelectrochemical platform for thrombin determination was developed based on Au-rGO-CuS as multiple signal amplification elements. CuInS2 QDs was used to sensitize burr-shape TiO2 (b-TiO2) to obtain a strong photocurrent. Under the specific recognition between aptamer and thrombin, a sandwichlike structure was formed and the Au-rGO-CuS-labeled aptamer (S2@Au-rGO-CuS) was immobilized on the electrode surface. This induced a sharp decrease in photocurrent. The phenomenon is mainly due to the fact that CuS NPs can competitively consume the light energy and electron donor with CuInS2/b-TiO2. The rGO can increase the amount of CuS NPs and the Au NPs can accelerate charge transferring which depress the recombination of photogenerated electrons and holes in CuS to further enhance the competitive capacity of CuS. The sandwichlike structure has a steric hindrance effect. Therefore, the S2@Au-rGO-CuS has a multiple signal amplification function for thrombin determination. Under optimal conditions, the PEC aptasensor exhibited a wide linear concentration range from 0.1 pM to 10 nM with a low detection limit of 30 fM (S/N = 3) for thrombin. Besides, the designed aptasensor performed well in the assay of human serum sample, indicating good potential for the determination of thrombin in real samples.

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Funding

This work was supported by the National Natural Science Foundation of China (Grant no. U1504216; 21575130) and Startup Research Fund of Zhengzhou University (Grant no. 1511316006).

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Authors and Affiliations

  1. College of Chemistry, Zhengzhou University, Zhengzhou, 450001, People’s Republic of China

    Lina Zou, Yi Zhan, Di Huang & Baoxian Ye

  2. Zhumadian Hydrology and Water Resource Survery Bureau of Henan Province, Zhumadian, 463000, People’s Republic of China

    Lingxi Yang

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  1. Lina Zou
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Zou, L., Yang, L., Zhan, Y. et al. Photoelectrochemical aptasensor for thrombin based on Au-rGO-CuS as signal amplification elements. Microchim Acta 187, 433 (2020). https://doi.org/10.1007/s00604-020-04380-x

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