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Molecular Imprinted ZnS Quantum Dots-Based Sensor for Selective Sulfanilamide Detection.

Xin Zhang1,2, Pengfei Jiao1, Yihan Ma1

  • 1School of Life Science and Agricultural Engineering, Nanyang Normal University, Nanyang 473061, China.

Polymers
|September 9, 2022
PubMed
Summary

A novel fluorescence sensor combining molecular imprinted polymers and quantum dots offers rapid and selective detection of sulfanilamide in water. This sensor demonstrates high sensitivity and stability for environmental monitoring.

Keywords:
fluorescence sensormolecular imprinted polymerssulfanilamidezinc sulfide quantum dots

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Sulfanilamide detection in water is crucial for environmental and health safety.
  • Existing methods for sulfanilamide detection can be time-consuming or lack selectivity.
  • Quantum dots (QDs) offer unique optical properties for sensing applications.

Purpose of the Study:

  • To develop a novel molecular imprinted polymers-based fluorescence sensor for sulfanilamide detection.
  • To enhance the selectivity and sensitivity of sulfanilamide sensing in water samples.
  • To evaluate the performance of the sensor in real water samples.

Main Methods:

  • Synthesized manganese-doped zinc sulfide quantum dots (Mn²⁺: ZnS QDs).
  • Constructed molecule imprinted quantum dots (MIP@QDs) using surface molecular imprinting technology.
  • Utilized fluorescence spectroscopy for sulfanilamide detection.

Main Results:

  • The MIP@QDs sensor exhibited rapid fluorescent responses (5 min) and high selectivity for sulfanilamide.
  • Achieved a good linearity (R² = 0.9916) over a concentration range of 2.90 × 10⁻⁸ to 2.90 × 10⁻⁶ mol L⁻¹.
  • Demonstrated a low detection limit of 3.23 × 10⁻⁹ mol L⁻¹ and high recoveries (96.80%-104.33%) in real samples.

Conclusions:

  • The developed MIP@QDs sensor is a promising tool for selective and sensitive fluorescence sensing of sulfanilamide.
  • The sensor shows good stability, recyclability, and potential for practical application in water quality monitoring.
  • This approach integrates the advantages of molecular imprinting and quantum dots for advanced chemical sensing.