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Colorimetric immunoassay for rapid detection of Staphylococcus aureus based on etching-enhanced peroxidase-like catalytic activity of gold nanoparticles

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Abstract

A novel colorimetric immunoassay for the detection of Staphylococcus aureus (S. aureus) based on a combination of immunomagnetic separation and signal amplification via etching-enhanced peroxidase-like catalytic activity of gold nanoparticles (AuNPs) was developed. Nanoconjugates composed of gold and iron oxide nanoparticles were synthesized and further modified with antiS. aureus immunoglobulin Y (IgY), which was used for the selective enrichment and rapid separation of target bacteria in complex matrices. AuNPs functionalized with antiS. aureus aptamer were used as an artificial enzyme which has peroxidase-like catalysis activity. Catalytic activity of AuNPs is inhibited by modifying aptamer. However, catalysis of modified AuNPs remarkably enhanced by hydrogen peroxide etching. Based on collecting unbound modified AuNPs in the supernatant and 3,3′,5,5′-tetramethylbenzidine-hydrogen peroxide reporting system, the yellow color of solution decreases linearly with increasing the concentration of S. aureus ranging from 10 to 106 cfu/mL. The limit of detection is 10 cfu/mL, and total detection time is 65 min. The recoveries of the S. aureus spiked in food samples are 88.2–119.8%.

Schematic illustration of colorimetric method for detection of S. aureus based on the IgY-Fe3O4/Au nanocomposites as capture probes and apt-AuNPs as artificial enzyme with etching-enhanced peroxidase-like catalytic activity.

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Funding

The authors thank the financial support from the National Natural Science Foundation of China (Grant No. 81872668), Health commission of Jilin Province (2018Q033) and Norman Bethune Health Science Center of Jilin University (2018A05), Jilin Province Development and Reform Commission (Grant No. 2019C049-3), Jilin Province Science and Technology Development Plan Item (Grant No.: 20200602010ZP and 20200403035SF).

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Authors and Affiliations

  1. School of Public Health, Jilin University, Changchun, 130021, China

    Shuo Yao, Juan Li, Bo Pang, Xuechen Wang, Yujie Shi, Xiuling Song, Kun Xu, Juan Wang & Chao Zhao

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  1. Shuo Yao
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  2. Juan Li
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  3. Bo Pang
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  4. Xuechen Wang
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  5. Yujie Shi
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  6. Xiuling Song
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  7. Kun Xu
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  8. Juan Wang
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  9. Chao Zhao
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Correspondence to Juan Wang or Chao Zhao.

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Yao, S., Li, J., Pang, B. et al. Colorimetric immunoassay for rapid detection of Staphylococcus aureus based on etching-enhanced peroxidase-like catalytic activity of gold nanoparticles. Microchim Acta 187, 504 (2020). https://doi.org/10.1007/s00604-020-04473-7

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