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Affinity chemiresistor sensor for sugars.

Chaker Tlili1, Sushmee Badhulika2, Thien-Toan Tran3

  • 1Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, USA.

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|July 26, 2014
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Summary

A novel non-enzymatic sugar sensor uses boronic acid-modified carbon nanotubes for sensitive detection of glucose, fructose, and sucrose. This reusable sensor demonstrates high specificity and no interference from common compounds.

Keywords:
Boronic acidNon-enzymatic sensorSingle-walled carbon nanotubesSugar

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Development of non-enzymatic sensors is crucial for accurate sugar detection.
  • Single-walled carbon nanotubes (SWNTs) offer excellent electrical properties for sensor applications.
  • Boronic acid is a versatile receptor for carbohydrate binding.

Purpose of the Study:

  • To develop a non-enzymatic chemiresistive sensor for sugar detection.
  • To utilize a synthetic receptor immobilized on SWNTs.
  • To evaluate sensor performance, specificity, and reusability.

Main Methods:

  • Immobilization of boronic acid onto aligned single-walled carbon nanotubes (SWNTs) via amide bond formation.
  • Fabrication of a chemiresistive device for sugar sensing.
  • Investigation of sugar-ligand interactions, pH effects, and interference from electroactive compounds.

Main Results:

  • The sensor demonstrated specific and reproducible detection of d-glucose, d-fructose, and sucrose.
  • Optimal sensor response was observed at pH 9.
  • High sensitivity was achieved across concentration ranges of 1-20 mM (fructose), 1-25 mM (glucose), and 1-30 mM (sucrose).

Conclusions:

  • The developed sensor shows no interference from common electroactive compounds.
  • The sensor maintained 97.4% of its initial value after five regeneration cycles, indicating excellent reusability.
  • This non-enzymatic SWNT-based sensor presents a promising platform for accurate sugar monitoring.