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Immobilization of horseradish peroxidase on amino-functionalized carbon dots for the sensitive detection of hydrogen peroxide

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Abstract

The authors describe the preparation of amino-functionalized carbon dots (NH2-CDs) via a one-step hydrothermal process using silver nitrate and chitosan as the precursors. The NH2-CDs have a fairly consistent size distribution with an average size of 2.8 ± 0.5 nm. This is attributed to the introduction of Ag(I) both as a catalyst and a precipitant. The NH2-CDs are highly crystalline. Their surface carries amino groups and carboxy groups which is confirmed by transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) spectroscopy. Horseradish peroxidase (HRP) was immobilized in the NH2-CDs and then placed on a glassy carbon electrode (GCE). Spectroscopic and electrochemical analyses evidenced the stability and good bioactivity of the immobilized HRP. This reveals that NH2-CD is a desirable matrix for enzyme immobilization. The modified GCE exhibits enhanced electro-catalytic activity towards hydrogen peroxide (H2O2) reduction as compared to that of plain CDs. The effects of pH value and loading on the performances of the modified GCEs were studied. Under optimized conditions, the biosensor has a linear response in the 5 to 590 nM H2O2 concentration range, with a 1.8 nM defection limit (at an S/N ratio of 3). The sensor is stable, reproducible and selective. Finally, the sensor was applied to determine H2O2 in real samples, and satisfactory recoveries were achieved.

Amino-functionalized carbon dots (NH2-CDs) can provide more active sites and a friendly microenvironment for horseradish peroxidase (HRP) immobilization. Thus, a novel sensitive H2O2 biosensor has been developed.

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Acknowledgements

This work is supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions and the Project of Scientific and Technologic Infrastructure of Suzhou (SZS201207).

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Authors and Affiliations

  1. College of Chemistry, Chemical engineering and Materials Science, Soochow University, Suzhou, Jiangsu, 215123, People’s Republic of China

    Ya Su, Xuan Zhou, Yumei Long & Weifeng Li

  2. The Key Lab of Health Chemistry and Molecular Diagnosis of Suzhou, Suzhou, People’s Republic of China

    Yumei Long

  3. State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, 410082, People’s Republic of China

    Yumei Long

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Su, Y., Zhou, X., Long, Y. et al. Immobilization of horseradish peroxidase on amino-functionalized carbon dots for the sensitive detection of hydrogen peroxide. Microchim Acta 185, 114 (2018). https://doi.org/10.1007/s00604-017-2629-x

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