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Streptavidin-exposed magnetic nanoparticles for lectin magnetic separation (LMS) of Staphylococcus aureus prior to three quantification strategies

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Abstract

A lectin magnetic separation (LMS) method for Staphylococcus aureus (S. aureus) was developed with the aim to improve the efficiency of magnetic nanoparticles and to expand the scope of bacterial recognition. Poly(ethylene glycol) (PEG)-mediated magnetic nanoparticles modified with streptavidin (MNP-PEG-SA) were synthesized and then applied to a two-step LMS based on the use of wheat germ agglutinin (WGA). Three specific methods for S. aureus detection (suitable for different requirements including detection time and sensitivity) were designed. The new LMS has improved anchoring efficiency (compared to two-step LMS methods) and requires a reduced number of magnetic particles. The Baird–Parker (B-P) method can detect S. aureus with a detection limit of 3 × 100 CFU·mL−1 within 15 h; the polymerase chain reaction (PCR) method can be finished within 4 h, with the lowest detection limit (LOD) of 3 × 102 CFU·mL−1. The LOD of HRP-pig IgG-based colorimetric method is 3 × 105 CFU·mL−1, and the method only lasts for 2 h. If combined with specific detection methods, it meets different needs for rapid detection of S. aureus.

Schematic representation of lectin magnetic separation (LMS) based on biotin-wheat germ agglutinin (WGA) and poly (ethylene glycol) (PEG)-mediated streptavidin-modified magnetic nanoparticles (MNP-PEG-SA) and three different quantification strategies (including B-P culture assay, PCR assay, and colorimetric assay) for S. aureus.

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Acknowledgements

The work was supported by the National Key R&D Program of China (No.: 2018YFC1602500), Research Foundation from State Key Laboratory of Food Science and Technology, Nanchang University, China (No.: SKLF-ZZB-201720), and Educational Commission of Jiangxi Province, China (No.: GJJ150014).

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Authors and Affiliations

  1. State Key Laboratory of Food Science and Technology, Nanchang University, 235 Nanjing East Road, Nanchang, 330047, People’s Republic of China

    Guotai Yang, Yutong Wang, Guanhua Chen, Yu Zhao & Hengyi Xu

  2. GanSu Second Provincial People’s Hospital, Lanzhou, 730000, People’s Republic of China

    Min Huang

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  1. Guotai Yang
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  2. Min Huang
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  3. Yutong Wang
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  4. Guanhua Chen
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  5. Yu Zhao
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  6. Hengyi Xu
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Correspondence to Hengyi Xu.

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Yang, G., Huang, M., Wang, Y. et al. Streptavidin-exposed magnetic nanoparticles for lectin magnetic separation (LMS) of Staphylococcus aureus prior to three quantification strategies. Microchim Acta 186, 813 (2019). https://doi.org/10.1007/s00604-019-3978-4

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