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Visual arsenic detection in environmental waters: Innovating with a naked-eye biosensor for universal application.

Ming-Qi Liu1, Yan Guo2, Can Wu3

  • 1School of Public Health, Guangdong Medical University, Dongguan 523808, China.

Journal of Hazardous Materials
|August 3, 2024
PubMed
Summary

A new bacterial biosensor visually detects arsenic in water. This simple, cost-effective tool offers rapid, on-site arsenic detection for public health and environmental monitoring.

Keywords:
Bacterial biosensorColorimetric detectionEnvironmental water analysisGenetic optimizationPigment-based signal

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Area of Science:

  • Environmental Science
  • Biotechnology
  • Analytical Chemistry

Background:

  • Arsenic contamination in water is a major health concern.
  • Sensitive and accessible detection methods are crucial.
  • Current methods can be complex and costly.

Purpose of the Study:

  • To develop and optimize a bacterial biosensor for visual arsenic detection.
  • To enhance sensitivity and selectivity for arsenic detection.
  • To provide a simple, cost-effective method for on-site water analysis.

Main Methods:

  • Screening of six arsenic resistance (ars) operons.
  • Optimization of a genetic circuit to reduce background noise.
  • Incorporation of an arsenic-specific transport channel.

Main Results:

  • Achieved a sensitivity of 1 nM with a quantitative range of 0.036–1.171 µM.
  • Demonstrated anti-chelating agent interference properties.
  • Successfully detected arsenic in seawater within a linear range of 0.071–1.125 µM.
  • Confirmed selectivity for arsenic over other group 15 metals.

Conclusions:

  • The developed pigment-based biosensor provides a simple, visual method for arsenic detection.
  • The biosensor is effective for quantifying arsenic in various water sources, including seawater.
  • This naked-eye biosensor is a valuable tool for rapid, on-site environmental monitoring and public health.