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PEG-PtS2 nanosheet-based fluorescence biosensor for label-free human papillomavirus genotyping

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Abstract

A simple and efficient ultrasonication-assisted liquid exfoliation method is proposed to produce PtS2 nanosheets on a large scale and improve their dispersion in aqueous solution by surface polyethylene glycol modification. The interaction of polyethylene glycol-modified PtS2 (PEG-PtS2) nanosheets with fluorescent labeled DNA and the fluorescence quenching mechanism using FAM-labeled hpv16e6 gene fragment as a probe was investigated. The excitation and emission wavelengths were 468 and 517 nm, respectively. The fluorescence quenching mechanism of PEG-PtS2 nanosheets for double-stranded DNA (dsDNA) might stem from the static quenching effect. Based on the difference in fluorescence quenching capability of PEG-PtS2 nanosheets in fluorescent probe tagged single-stranded DNA (ssDNA) and dsDNA, a mix-and-detect method was proposed for determination of DNA. Without the need for probe immobilization and tedious washing steps, the genotyping of human papillomavirus (HPV) was easily achieved. The limit of detection was calculated to 0.44 nM, showing a good linear range within 0.05–10 nM. We believe this biosensor provides opportunities to develop a simple and low-cost strategy for molecular diagnostics.

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Funding

This work was supported by grants from National Natural Science Foundation of China (21605160), Jiangsu Natural Science Foundation (BK20171387), “Double First-Class” University project (CPU2018GY25), Jiangsu Innovation and Enterpreneurship Project, and Open Research Fund of State Key Laboratory of Bioelectronics Southeast University, and Young Teachers’ Research Funding from College of Science, China Pharmaceutical University.

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  1. Wenxian Zhang and Shenchang Li contributed equally to this work.

Authors and Affiliations

  1. School of Science, Key Laboratory of Biomedical Functional Materials, China Pharmaceutical University, Nanjing, People’s Republic of China

    Wenxian Zhang, Shenchang Li, Xiuping Li, Man Liu, Tianyu Cui, Wenying Zhong, Bo Xu & Wanqing Yue

  2. Department of Biomedical Sciences, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, People’s Republic of China

    Huayang Fu & Mengsu Yang

  3. Key Laboratory of Drug Quality Control and Pharmacovigilance (China Pharmaceutical University), Ministry of Education, Nanjing, People’s Republic of China

    Wanqing Yue

Authors
  1. Wenxian Zhang
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  2. Shenchang Li
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  3. Xiuping Li
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  4. Man Liu
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  5. Tianyu Cui
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  8. Wenying Zhong
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  9. Bo Xu
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  10. Wanqing Yue
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Correspondence to Bo Xu or Wanqing Yue.

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Zhang, W., Li, S., Li, X. et al. PEG-PtS2 nanosheet-based fluorescence biosensor for label-free human papillomavirus genotyping. Microchim Acta 187, 408 (2020). https://doi.org/10.1007/s00604-020-04383-8

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