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Microchimica Acta

, Volume 183, Issue 10, pp 2753–2760 | Cite as

Colorimetric determination of staphylococcal enterotoxin B via DNAzyme-guided growth of gold nanoparticles

  • Dandan Zhou
  • Guoming Xie
  • Xianqing Cao
  • Xueping Chen
  • Xing Zhang
  • Hui ChenEmail author
Original Paper

Abstract

The authors describe a colorimetric method for the determination of the staphylococcal enterotoxin B (SEB) that also allows for visual readout. The assay is based on the growth of gold nanoparticles (AuNPs) mediated by a hemin/G-quadruplex DNAzyme which generates a color change from red to blue in the presence of SEB. The method is enzyme-free and does not require a label. The kinetics of the formation of the AuNPs is controlled by the hemin/G-quadruplex DNAzyme and this is key to the signal generation mechanism. In the presence of SEB, the reactions between aptamer and target modulated the amount of single probe G strands that form DNAzyme capable of consuming hydrogen peroxide. The growth process of AuNPs is influenced by the resulting concentration of H2O2 and leads to the color change. Under optimal conditions, a linear relationship exists between absorbance and SEB concentration in the range from 0.1 to 500 pg·mL‾1 which covers the clinically relevant range. In case of visual detection, the lower limit of detection is 1 pg·mL−1. The assay described here is sensitive, comparably inexpensive and can detect SEB rapidly without the need for sophisticated equipment. In our perception, the method has a wide scope in that it may be adapted to various nucleic acids, proteins and other biomolecules if respective aptamers are available.

Graphical abstract

Colorimetric determination of Staphylococcal enterotoxin B via DNAzyme-guided growth of gold nanoparticles

Keywords

Plasmonic resonance Aptamer Hemin/G-quadruplex Colorimetry Microplate assay Gold nanoparticle Staphylococcal enterotoxin B 

Notes

Acknowledgments

This work was financially supported by National Natural Science Foundation of China (No. 81171415).

Compliance with ethical standards

Competing interests

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

Supplementary material

604_2016_1919_MOESM1_ESM.docx (3.2 mb)
ESM 1 (DOCX 3.23 mb)

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Copyright information

© Springer-Verlag Wien 2016

Authors and Affiliations

  • Dandan Zhou
    • 1
  • Guoming Xie
    • 2
    • 3
  • Xianqing Cao
    • 2
  • Xueping Chen
    • 2
  • Xing Zhang
    • 2
  • Hui Chen
    • 1
    Email author
  1. 1.Clinical LaboratoriesThe First Affiliated Hospital of Chongqing Medical UniversityChongqingPeople’s Republic of China
  2. 2.Key Laboratory of Laboratory Medical Diagnostics, Ministry of Education, Department of Laboratory MedicineChongqing Medical UniversityChongqingPeople’s Republic of China
  3. 3.State and Local Joint Engineering Laboratory For Vascular ImplantsBioengineering College of Chongqing UniversityChongqingPeople’s Republic of China

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