Microchimica Acta

, 186:57 | Cite as

Disposable syringe-based visual immunotest for pathogenic bacteria based on the catalase mimicking activity of platinum nanoparticle-concanavalin A hybrid nanoflowers

  • Kui-Yu Wang
  • Sheng-Jun Bu
  • Chuan-Jing Ju
  • Ye Han
  • Cheng-You Ma
  • Wen-Sen Liu
  • Zhong-Yi Li
  • Chang-Tian LiEmail author
  • Jia-Yu WanEmail author
Original Paper


Disposable syringes were used in a novel point-of-care visual test for detecting pathogenic bacteria (Escherichia coli O157:H7 and Salmonella typhimurium). Hybrid nanoflowers composed of platinum nanoparticles and concanavalin A (Pt-nanoflowers) were prepared through a one-pot reaction and were found to be viable catalase mimics. They catalyze the decomposition of hydrogen peroxide (H2O2) to generate O2. When used as labels in immunoassays, they integrate both the functions of biological recognition and signal amplification. The disposable syringe pressure readout was combined with Pt-nanoflower signal conversion and successfully applied to a visual bacteria detection scheme. Both Escherichia coli O157:H7 and Salmonella typhimurium can be quantified with detection limits of as low as 15 and 7 CFU·mL−1, respectively.

Graphical abstract

One-pot synthetic platinum nanoparticle (PtNP)-concanavalin A hybrid nanoflowers (Pt-nanoflowers), have been used as ideal signal labels for immunoassays and integrating both essential functions of biological recognition and signal amplification. Disposable syringes were used as a readout to detect pathogenic bacteria.


Point-of-care Escherichia coli O157:H7 Salmonella typhimurium Hydrogen peroxide Detection limit 



This work was financially supported by the National Key Research and Development Program of China (No. 2016YFD0501001).

Compliance with ethical standards

The authors declare that there is no conflict of interest.

Supplementary material

604_2018_3133_MOESM1_ESM.docx (1.9 mb)
ESM 1 (DOCX 1.90 MB)


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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute of Military VeterinaryAcademy of Military Medical SciencesChangchunChina
  2. 2.The General Hospital of FAWChangchunChina
  3. 3.The Fourth Hospital of Jilin UniversityChangchunChina
  4. 4.School of Chemical Engineering and TechnologyTianjin UniversityTianjinChina
  5. 5.College of Geo-Exploration Science and TechnologyJilin UniversityChangchunChina
  6. 6.Engineering Research Center of Chinese Ministry of Education for Edible and Medicinal FungiJilin Agricultural UniversityChangchunChina

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