Abstract
The article describes a sensitive and rapid method for the colorimetric determination of Salmonella pullorum and Salmonella gallinarum (S. pullorum and S. gallinarum). Silica coated magnetic nanoparticles (MNP) were modified with antibodies against S. pullorum and S. gallinarum to act as the capture probes. Horseradish peroxidase (HRP) and antibodies against S. pullorum and S. gallinarum on silica nanoparticles (HRP-IgG-SiNP) were used as detection probes (secondary antibody). In the presence of S. pullorum and S. gallinarum, the target bacteria are captured by capture probes and detection probes to form sandwich structures. This sandwich complexes were then magnetically isolated and used to catalytically oxidize the chromogenic substrate 3,3′,5,5′-tetramethylbenzidine (TMB). The absorbance at 450 nm is proportional to the concentration of S. pullorum and S. gallinarum. Under the optimized conditions, the assay has a detection range that extends from from 8.4 × 103 to 8.4 × 107 CFU⋅mL−1, and the limit of detection is 1.7 × 103 CFU⋅mL−1. The approach is cost-effective and specific. Sample preconcentration is not required. In our perception, this immunomagnetic nanoparticle-based detection strategy holds great promise for on-site detection of a wide range of pathogens by using the respective antibodies.
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Acknowledgements
This work was financially supported by a grant from National Natural Science Foundation of Zhejiang Province (LY17C2000003), the Food and Engineering most important discipline of Zhejiang province (JYTSP20141062), Zhejiang public Innovation Platform Analysis and testing project (2015C37023), the Talent training provincial superior paper funded project (1110JY1412001P), Technological Innovation Projectof Zhejiang Gongshang University (CX201610024, CX201610019), Postgraduate Scientific and Technological Innovation Project of Zhejiang Gongshang University and plans of college students in Zhejiang province and technology innovation activities (acrobatic tender grass talent programme) project (1110JQ4212048G, 1110KZN0213112G).
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The original version of this article was revised: Table 1 contained error. Given in this article is the correct table.
An erratum to this article is available at http://dx.doi.org/10.1007/s00604-017-2274-4.
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Zhu, H., Zhao, G., Wang, S.Q. et al. Photometric sandwich immunoassay for Salmonella pullorum and Salmonella gallinarum using horseradish peroxidase and magnetic silica nanoparticles. Microchim Acta 184, 1873–1880 (2017). https://doi.org/10.1007/s00604-017-2241-0
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DOI: https://doi.org/10.1007/s00604-017-2241-0