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Microchimica Acta

, 185:462 | Cite as

Aptamer based voltammetric patulin assay based on the use of ZnO nanorods

  • Baoshan He
  • Xiaoze Dong
Original Paper

Abstract

The authors describe an aptamer based assay for the mycotoxin patulin (PAT). A gold electrode was modified with a composite made from ZnO nanorods (ZnO-NRs) and chitosan. The ZnO-NRs was prepared by reaction with ammonia and subsequent hydrothermal growth. Its properties were characterized by X-ray diffraction, Raman spectroscopy and scanning electron microscopy. Subsequently, thiol-modified aptamers were self-assembled on AuNPs that had been electrodeposited on the surface of the modified electrode. The presence of ZnO-NRs on the electrode increases the loading with AuNPs and aptamers. It also warrants a relatively stable microenvironment for the aptamers. In the presence of PAT, it will form a complex with the aptamer on the electrode surface. This hinders electron transfer from the electrode to the redox probe hexacyanoferrate and results in reduced current, which is typically measured at 0.176 V (vs. Ag/AgCl). The concentration of PAT can be calculated from the differences in the peak current before and after incubation with PAT. The assay has a linear response in the 50 ng·mL−1 to 0.5 pg·mL−1 PAT concentration range and a 0.27 pg·mL−1 lower detection limit. The sensor is specific, reproducible, repeatable, and long-term stable. It was successfully applied to the determination of PAT in spiked juice samples.

Graphical abstract

Schematic representation of aptamer based detection of patulin (PAT). It is based on the fact that ZnO nanorods on the surface of the electrode increase the loading of the gold nanoparticles and the aptamers, thereby improving the electrode performance.

Keywords

Aptasensor Patulin Chitosan Electrodeposited gold nanoparticles Rapid detection 

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant No. 61301037), the Cultivation Plan for Young Core Teachers in Universities of Henan Province (No. 2017GGJS072), the Henan Science and Technology Cooperation Project (Grant No. 172106000014), and the Youth Backbone Teacher Training Program of Henan University of Technology.

Compliance with ethical standards

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

Supplementary material

604_2018_3006_MOESM1_ESM.docx (762 kb)
ESM 1 (DOCX 761 kb)

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Copyright information

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

Authors and Affiliations

  1. 1.School of Food Science and Technology, Henan Key Laboratory of Cereal and Oil Food Safety Inspection and ControlHenan University of TechnologyZhengzhouPeople’s Republic of China

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