A flow cytometric method to assess nanoparticle uptake in bacteria.

Area of Science:

• Environmental Science
• Toxicology
• Microbiology

Background:

• Engineered nanomaterials (ENMs) pose potential environmental and health risks.
• Assessing ENM ecotoxicity requires understanding nanoparticle uptake in organisms.
• Current methods for detecting ENM cellular uptake are limited, hindering research.

Purpose of the Study:

• To develop a novel flow cytometry-based method for detecting ENM internalization in live bacteria.
• To assess the dose-dependent uptake of Zinc oxide (ZnO) and Titanium (IV) oxide (TiO(2)) nanoparticles in Escherichia coli.
• To evaluate the method's capability in tracking ENM presence across multiple bacterial generations.

Main Methods:

• Utilized flow cytometry for rapid detection of ENM internalization in live bacteria.
• Investigated nanoparticle uptake in Escherichia coli under various experimental conditions.
• Performed multigeneration studies to track ENM presence in bacteria.

Main Results:

• Demonstrated significant, dose-dependent internalization of ZnO and TiO(2) nanoparticles in E. coli.
• Observed increased side scatter (SSC) intensity indicating nanoparticle uptake, influenced by the presence of liver-S9 fraction.
• Successfully detected ENMs in E. coli for up to four generations using the developed method.

Conclusions:

• The developed flow cytometry method enables rapid and reliable assessment of ENM uptake in bacteria.
• This technique provides a valuable tool for toxicologists in conducting ecotoxicity studies of ENMs.
• Facilitates the evaluation of ENM safety for environmental and health risk assessment.