Detecting endocrine disrupting compounds in water using sulfur-oxidizing bacteria

Area of Science:

• Environmental Science
• Microbiology
• Analytical Chemistry

Background:

• Endocrine disrupting compounds (EDCs) pose risks to aquatic ecosystems and human health.
• Existing detection methods can be slow or lack sensitivity.
• Sulfur-oxidizing bacteria (SOB) have a unique metabolic pathway sensitive to environmental changes.

Purpose of the Study:

• To develop a novel, rapid, and reliable toxicity detection methodology for EDCs in water.
• To leverage the metabolic activity of SOB for sensing toxic compounds.
• To establish a sensitive early warning system for water pollution.

Main Methods:

• A biosensor was engineered utilizing the sulfur oxidation by SOB.
• The system monitors changes in electrical conductivity (EC) and pH.
• EDCs were introduced to assess their inhibitory effect on SOB activity.

Main Results:

• SOB activity leads to increased EC and decreased pH.
• Inhibition of SOB by EDCs caused decreased EC and increased pH.
• The biosensor detected EDCs in the 50-200 ppb range, demonstrating high sensitivity.
• Toxicity detection occurred within minutes to hours.

Conclusions:

• The SOB-based biosensor provides a rapid and sensitive method for detecting EDCs in water.
• This technology offers a valuable early warning system for environmental monitoring.
• The biosensor's sensitivity surpasses many existing whole-cell biosensors.