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Colorimetric captopril assay based on oxidative etching-directed morphology control of silver nanoprisms

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Abstract

Oxidative etching is an effective approach to control the morphology of nanomaterials. Taking silver nanocrystals (AgNCs) as an example, oxidative etching-directed morphological transformation from a triangular prism shape to a disk shape is achieved and then applied to the determination of captopril. As a mediator, trace amount of halides play important roles in the shape-controlled evolution of AgNCs. Etching causes the color of the triangular silver nanoprims (AgNPRs) to change from blue to yellow on formation of round nanodisks. On addition of captopril, the oxidative etching of the AgNPRs is prevented owing to the protection by the drug via Ag-S bonding. In this case, the solution color does not change. This finding was used to design an assay of captopril that has a linear response in the 10–600 nM concentration range and a 2 nM limit of detection. This method also allows digital camera read-out. It was successfully applied to quality control of captopril in tablets.

Oxidative etching-directed morphological transformation of silver nanocrystals is well manipulated and successfully applied in colorimetric determination of captopril in tablets.

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Acknowledgements

This work was sponsored by the National Natural Science Foundation of China (No. 21775014 and 81972020). Y. W. was also sponsored by the Chongqing High-level Personnel of Special Support Program (Youth Top-notch Talent). P. Z. was also sponsored by the Chongqing Talent Program (Youth Top-notch Talent).

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Authors and Affiliations

  1. College of Pharmacy, Chongqing Medical University, Chongqing, 400016, China

    Pu Zhang

  2. Children’s Hospital of Chongqing Medical University, Chongqing, 400014, China

    Li Wang

  3. College of Chemistry, Chongqing Normal University, Chongqing, 401331, China

    Jing Zeng, Juan Tan & Yi Wang

  4. School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, China

    Yunfei Long

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  1. Pu Zhang
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  2. Li Wang
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  6. Yi Wang
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Correspondence to Yi Wang.

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Zhang, P., Wang, L., Zeng, J. et al. Colorimetric captopril assay based on oxidative etching-directed morphology control of silver nanoprisms. Microchim Acta 187, 107 (2020). https://doi.org/10.1007/s00604-019-4071-8

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