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Open AccessArticle

A One-Step Homogeneous Sandwich Immunosensor for Salmonella Detection Based on Magnetic Nanoparticles (MNPs) and Quantum Dots (QDs)

1
School of Food Science and Technology, State Key Lab of Food Science and Technology, Jiangnan University, Wuxi 214122, Jiangsu, China
2
YanCheng Teachers University, Yancheng 214122, Jiangsu, China
3
Research Center of Hunan Entry-Exit Inspection and Quarantine Bureau, Changsha 410001, Hunan, China
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2013, 14(4), 8603-8610; https://doi.org/10.3390/ijms14048603
Received: 6 February 2013 / Revised: 15 April 2013 / Accepted: 16 April 2013 / Published: 22 April 2013
(This article belongs to the Special Issue Magnetic Nanoparticles 2013)
Simple immuno-magnetic separation tandem fluorescent probes based on quantum dots-antibody (QDs-Ab) were developed to detect Salmonella with sensitivity of 500 cfu mL−1. With two monoclonal antibodies, which recognize different antigenic determinant on the surface of Salmonella, we prepared antibody-coated magnetic nanoparticles (MNPs) and conjugates of QDs-Ab. The immune-magnetic beads were verified with high enrichment efficiency for Salmonella (90%). A sandwich structure formed if the Salmonella solution was mixed together with immune-beads and QDs-Ab, and the fluorescent single from QDs was related to the amount of Salmonella. A linear response between fluorescence intensity and various concentrations of Salmonella (2.5 × 103 to 1.95 × 108 cfu mL−1) were observed with this proposed method. The total assay time for Salmonella was 30 min, and no cross-reaction to other microbial strains, such as Staphylococcus aureus, Escherichia coli (E. coli) and Escherichia coli O157:H7 (E. coli O157:H7), were found using this detection system. All our results showed that the simple homogeneous immunoassay could be applied in Salmonella screening without time-consuming extra-enrichment of bacteria. View Full-Text
Keywords: Salmonella; fluorescent immunoassay; magnetic separation; quantum dots Salmonella; fluorescent immunoassay; magnetic separation; quantum dots
MDPI and ACS Style

Kuang, H.; Cui, G.; Chen, X.; Yin, H.; Yong, Q.; Xu, L.; Peng, C.; Wang, L.; Xu, C. A One-Step Homogeneous Sandwich Immunosensor for Salmonella Detection Based on Magnetic Nanoparticles (MNPs) and Quantum Dots (QDs). Int. J. Mol. Sci. 2013, 14, 8603-8610.

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