Microchimica Acta

, 185:254 | Cite as

Fluorometric aptamer based assay for ochratoxin A based on the use of exonuclease III

  • Renjie Liu
  • Hua Wu
  • Lei Lv
  • Xiaojiao Kang
  • Chengbi Cui
  • Jin Feng
  • Zhijun Guo
Original Paper


This study describes an aptamer based assay for the mycotoxin ochratoxin A (OTA). The method is based on the use of an OTA-specific aptamer, exonuclease (Exo) III, SYBR Gold as a fluorescent probe, and a complementary strand that specifically combines with the aptamer. In the presence of OTA, the aptamer and OTA hybridize, thereby resulting in the formation of ssDNA, which is not digested by Exo III. Intense fluorescence is observed after addition of SYBR Gold (best measured at excitation/emission wavelengths of 495/540 nm). Fluorescence increases linearly with the log of the OTA concentration in the range from 8 to 1000 ng·mL−1. The detection limit is 4.7 ng·mL−1. The assay was applied to the determination of OTA in diluted [2%(v/v)] red wine, and recoveries and RSDs ranged between 93.5% and 113.8%, and between 3.2% and 5.7%, respectively.

Graphical abstract

In the presence of ochratoxin A (OTA), specific combinations of aptamer and OTA may occur and result in DNA double strands being untied, which avoids being digested by Exo III. Intense fluorescence is observed after SYBR Gold addition.


Mycotoxin Fluorescent probe Exo III Complementary strand 



This work was supported by the National Natural Science Foundation of China (Nos. 31460423 and 31360384), the department of Sciences & Technology of Jilin Province (20160520047JH) and the department of education of Jilin Province (2016252).

Compliance with ethical standards

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

Supplementary material

604_2018_2786_MOESM1_ESM.doc (180 kb)
ESM 1 (DOC 179 kb)


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Copyright information

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

Authors and Affiliations

  • Renjie Liu
    • 1
  • Hua Wu
    • 1
    • 2
  • Lei Lv
    • 2
  • Xiaojiao Kang
    • 3
  • Chengbi Cui
    • 2
  • Jin Feng
    • 2
  • Zhijun Guo
    • 2
  1. 1.Institute of food science and engineeringJilin agricultural UniversityChangchunChina
  2. 2.College of agricultureYanbian universityYanjiChina
  3. 3.School of Electrical Engineering and IntelligentizationDongguan University of TechnologyDongguanChina

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