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Label-free detection of kanamycin using aptamer-based cantilever array sensor.

Xiaojing Bai1, Hui Hou1, Bailin Zhang2

  • 1State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China.

Biosensors & Bioelectronics
|February 1, 2014
PubMed
Summary

A novel aptamer-based cantilever array sensor offers label-free detection of kanamycin. This biosensor achieves sensitive and selective antibiotic detection, showing potential for broader molecular analysis.

Keywords:
AptamerCantilever array sensorKanamycinSurface stress change

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Biosensor Technology

Background:

  • Accurate detection of antibiotics like kanamycin is crucial for various applications.
  • Existing detection methods may lack sensitivity, selectivity, or require labeling.
  • Development of label-free biosensors offers a promising alternative for efficient molecular detection.

Purpose of the Study:

  • To develop a label-free detection method for kanamycin using an aptamer-based cantilever array sensor.
  • To investigate the sensor's performance in terms of sensitivity, linearity, and selectivity.
  • To explore the potential of this platform for detecting other molecules.

Main Methods:

  • Fabrication of a cantilever array sensor with sensing cantilevers functionalized with kanamycin aptamers and reference cantilevers modified with 6-mercapto-1-hexanol (MCH).
  • Utilizing differential deflection measurements between sensing and reference cantilever pairs to detect kanamycin.
  • Characterizing the sensor's response to varying kanamycin concentrations and assessing selectivity against other antibiotics.

Main Results:

  • The aptamer-based cantilever array sensor demonstrated label-free detection of kanamycin.
  • A linear relationship was observed between surface stress change and kanamycin concentration from 100 μM to 10 mM (R²=0.995).
  • A detection limit of 50 μM was achieved, with good selectivity against neomycin, ribostamycin, and chloramphenicol.

Conclusions:

  • The developed aptamer-based cantilever array sensor provides a sensitive and selective method for label-free kanamycin detection.
  • The sensor's design allows for direct measurement of differential cantilever deflections, simplifying the detection process.
  • This facile detection platform holds significant potential for the analysis of various other molecules beyond kanamycin.