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Rapid saline-alkali sensitivity testing using hydrogel/gold nanoparticles-modified screen-printed electrodes.

Ting Zhang1, Juan Han1, Houjin Zhang1

  • 1Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, MOE Key Laboratory of Molecular Biophysics, Wuhan 430074, China.

The Science of the Total Environment
|December 12, 2022
PubMed
Summary

A new electrochemical method rapidly screens saline-alkali-tolerant bacteria in under 45 minutes. This technique offers a faster, more efficient alternative to traditional culture methods for improving saline-alkali land.

Keywords:
Electrochemical biosensorElectrochemical impedance spectroscopy (EIS)Saline-alkali tolerance

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Area of Science:

  • Environmental microbiology
  • Biosensor technology
  • Electrochemistry

Background:

  • Saline-alkali land degradation necessitates rapid screening of tolerant microorganisms.
  • Traditional bacterial culture methods are time-consuming (1-2 days).
  • Developing faster screening methods is crucial for land improvement.

Purpose of the Study:

  • To develop a novel electrochemical method for rapid screening of saline-alkali-tolerant bacteria.
  • To assess the efficiency of a hydrogel/gold nanoparticles-modified screen-printed electrode for this purpose.
  • To establish a method for measuring saline-alkali sensitivity quickly.

Main Methods:

  • Utilized a hydrogel/gold nanoparticles-modified screen-printed electrode.
  • Employed electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV) to monitor bacterial growth.
  • Deposited bacterial strains on modified electrodes and applied saline-alkali treatment (50 mM).

Main Results:

  • Established electrochemical-derived growth curves to assess saline-alkali tolerance.
  • E. coli growth was inhibited by saline-alkali conditions.
  • Paenibacillus lautus (HC_A) and Lysinibacillus fusiformis (HC_B) demonstrated growth under saline-alkali conditions.
  • Salinity sensitivity results obtained in <45 minutes.

Conclusions:

  • The novel electrochemical method provides rapid, efficient, and cost-effective screening of saline-alkali-tolerant bacteria.
  • This technique significantly reduces screening time compared to traditional methods.
  • The developed method holds promise for the improvement of saline-alkali land through microbial selection.