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Microchimica Acta

, 185:360 | Cite as

Colorimetric immunoassay for Listeria monocytogenes by using core gold nanoparticles, silver nanoclusters as oxidase mimetics, and aptamer-conjugated magnetic nanoparticles

Original Paper
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Abstract

The authors describe a rapid colorimetric assay for Listeria monocytogenes (L. monocytogenes) based on the o-phenylenediamine-mediated deaggregation of gold nanoparticles. Silver nanoclusters are used as an artificial enzyme that can oxidize o-phenylenediamine to form o-benzoquinone diamine. Aptamer and IgY antibodies were chosen to conjugate with magnetic beads and silver nanoclusters, respectively, which can recognize and bind L. monocytogenes at different specific binding sites. This results in the disassembly of colloidal gold nanoparticles which is accompanied by a color change from blue to red, with peaks at 730 and 525 nm, respectively. The method allows L. monocytogenes to be colorimetrically determined in the 10 to 106 cfu·mL−1 concentration range without pre-enrichment, and the limit of detection is as low as 10 cfu·mL−1. Recoveries ranging from 97.4 to 101.3% are found when analyzing spiked food samples. The assay is rapid, sensitive and specific.

Graphical abstract

Schematic illustration of a colorimetric method for detection of L. monocytogenes based on silver nanoclusters-catalyzed oxidation of OPD and de-aggregation of GNPs. A color change from blue to red can be observed and correlated to the concentration of L. monocytogenes.

Keywords

Food safety Visual detection de-aggregation Immunomagnetic separation Nanozyme o-phenylenediamine 

Notes

Acknowledgements

This study was supported by the Chinese National Natural Science Foundation (Grant No. 81602894, 81602895, and 81473018), China Postdoctoral Science Foundation (Grant No. 2017 T100214 and 2016 M591492), the Development Foundation of Science and Technology in Jilin Province of China (Grant No. 20170204003SF) and Graduate Innovation Fund of Jilin University (Grant No. 2017084).

Compliance with ethical standards

The author(s) declare that they have no competing interests.

Supplementary material

604_2018_2896_MOESM1_ESM.docx (3.7 mb)
ESM 1 (DOCX 3759 kb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Public HealthJilin UniversityChangchunChina
  2. 2.The Department of Medical Insurance ManagementThe Second Hospital of Jilin UniversityChangchunChina

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