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A Fast and Easily Parallelizable Biosensor Method for Measuring Extractable Tetracyclines in Soils.

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  • 1Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences , Nanjing Agricultural University , Nanjing 210095 , China.

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A new whole-cell biosensor method efficiently quantifies extractable tetracyclines in soil. This rapid, cost-effective approach aids in assessing antibiotic bioavailability and environmental risks.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Microbiology

Background:

  • Quantifying soil antibiotics is crucial for assessing environmental and health risks.
  • Existing methods like HPLC are time-consuming and costly for large-scale analysis.

Purpose of the Study:

  • To develop a rapid, cost-effective whole-cell biosensor for detecting extractable tetracyclines in diverse soil types.
  • To compare the performance of two reporter plasmids (pMTGFP and pMTmCherry) for tetracycline detection.

Main Methods:

  • Utilized whole-cell biosensors with reporter plasmids (pMTGFP or pMTmCherry) controlled by tetracycline-responsive elements.
  • Tested the biosensor method on Alfisol, Mollisol, and Ultisol soil extracts.
  • Evaluated detection limits and relative standard deviation for tetracycline quantification.

Main Results:

  • The biosensor method can analyze over 96 samples within 6 hours, significantly faster than HPLC.
  • Detection limits for six tetracyclines ranged from 5.32-10.2 μg/kg soil.
  • The E. coli DH5α/pMTmCherry biosensor demonstrated superior precision compared to E. coli DH5α/pMTGFP.

Conclusions:

  • The developed whole-cell biosensor offers a fast, parallelizable, and cost-effective alternative for quantifying soil tetracyclines.
  • This method is suitable for large-scale soil monitoring studies to assess antibiotic contamination.
  • E. coli DH5α/pMTmCherry is recommended for improved accuracy in tetracycline detection in soil samples.