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A composite prepared from MoS2 quantum dots and silver nanoparticles and stimulated by mercury(II) is a robust oxidase mimetic for use in visual determination of cysteine

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Abstract

MoS2 quantum dots were hydrothermally synthesized and utilized for the formation and stabilization of a nanocomposite with silver nanoparticles (AgNPs) in a single step. This composite was characterized by transmission electron microscopy and zeta potential measurements. It is found that this nanohybrid can be stimulated by mercury(II) ion and then exhibits excellent oxidase mimicking activity. The oxidase-like activity is demonstrated by the oxidation of 3,3′,5,5′-tetramethylbenzidine by H2O2 that leads to the formation of a blue product. An assay was developed for determination of cysteine (Cys) at ultra-trace level because Cys inhibits the activity of the nanozyme via interaction with Hg(II). The Cys assay, best performed at a wavelength of 652 nm, works in the 1–100 μM concentration range and has a 0.82 μM detection limit. In addition, a portable Cys test kit is described that was applied to the determination of Cys in serum samples. The resulting colorations were compared with color chat wheel. The method is simple, rapid, cost-effective, and sensitive.

Schematic presentation of oxidase mimetic activity of the Hg@ MoS2-QDs-AgNPs and colorimetric sensing of Cys.

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Acknowledgements

All the authors are thankful to Prof D Dash, IMS, BHU, Varanasi for his support in biological experiments and providing blood serum. Authors are also thankful to CIF, IIT (BHU) for providing instrumentation facilities. Richa Mishra is thankful to DST-INSPIRE for providing her fellowship. Dr. Narsingh R. Nirala greatly acknowledges SERB N-PDF (PDF/2016/000243).

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Authors and Affiliations

  1. School of Materials Science and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, India

    Ravi Prakash Ojha, Richa Mishra, Priya Singh, Narsingh Raw Nirala & Rajiv Prakash

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  1. Ravi Prakash Ojha
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Correspondence to Narsingh Raw Nirala or Rajiv Prakash.

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Ojha, R.P., Mishra, R., Singh, P. et al. A composite prepared from MoS2 quantum dots and silver nanoparticles and stimulated by mercury(II) is a robust oxidase mimetic for use in visual determination of cysteine. Microchim Acta 187, 74 (2020). https://doi.org/10.1007/s00604-019-4041-1

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