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Peroxidase activities of gold nanowires synthesized by TMV as template and their application in detection of cancer cells

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Abstract

A sensing methodology that combines Au, tobacco mosaic virus (TMV), and folic acid for selective, sensitive, and colorimetric detection of tumor cells based on the peroxidase-like activity was reported in this study. Gold nanowires with a high aspect ratio were synthesized using TMV as a template. Au@TMV nanowire (AT) complex was obtained with diameter of 4 nm and length between 200 and 300 nm. In addition, since TMV was biocompatible and had many amino and carboxyl groups on its surface, AT was conjugated by folate to form a folic acid (FA)–conjugated AT composite (ATF) and tested by FTIR measurements. Furthermore, the peroxidase-like properties were studied and the optimal conditions for mimic enzyme activity were optimized. Finally, HeLa and other tumor cells expressed excessive receptors of folate on the surface, which can specifically bind to folic acid. As the specific binding of ATF with HeLa cells, the peroxidase properties of ATF were used for detection of cancer cells (Scheme 1). The cancer cells were detected not only qualitatively but also quantitatively. In this study, as low as 2000 cancer cells/mL could be detected using the current method.

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Acknowledgments

The authors would like to express special appreciation to scientist Yanhong Liu (Molecular Characterization of Foodborne Pathogens Research Unit, Eastern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, Wyndmoor, PA 19038, USA) for polishing the manuscript.

Funding

This study was funded by National Natural Science Foundation of China (51678120).

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Correspondence to Min Zhao.

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Qu, Y., Yang, Y., Du, R. et al. Peroxidase activities of gold nanowires synthesized by TMV as template and their application in detection of cancer cells. Appl Microbiol Biotechnol 104, 3947–3957 (2020). https://doi.org/10.1007/s00253-020-10520-3

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  • DOI: https://doi.org/10.1007/s00253-020-10520-3

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