Chemical Research in Chinese Universities

, Volume 34, Issue 4, pp 541–545 | Cite as

A Label-free and Functional Fluorescent Oligonucleotide Probe Based on a G-Quadruplex Molecular Beacon for the Detection of Kanamycin

  • Yuqing Zhu
  • Wei LiEmail author
  • Suzhen TanEmail author
  • Tianxiao Chen


A label-free and turn-off fluorescent method for the quantitative detection of kanamycin based on a functional molecular beacon was developed. The molecular beacon consists of two hairpin structures with a split G-rich oligonucleotide in the middle. The kanamycin’s aptamer formed the loops portion for recognizing kanamycin, and the G-quadruplex bound by Thioflavin T(ThT) was employed as the reporter. In the absence of target, the molecular beacon folded into double stem-loops and the splited G-rich oligonucleotid came close to form a G-quadruplex. When ThT bound to the G-quadruplex, the fluorescence intensity of the solution increased. Upon the addition of kanamycin, the function between kanamycin and aptamer unfolded the hairpin and disassembled the G-quadraplex structure, resulting in a significant decrease in the fluorescence intensity. A good linear relationship ranging from 0.7 nmol/L to 10 nmol/L was achieved and the limit of detection was 0.37 nmol/L. Besides, it could efficiently recognize kanamycin in real samples.


Molecular beacon Fluorescence Kanamycin G-Quadruplex Thioflavin T 


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Copyright information

© Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Chemistry and Biological EngineeringChangsha University of Science and TechnologyChangshaP. R. China

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