Isolation and characterization of acetonitrile utilizing bacteria

Area of Science:

• Microbiology
• Biochemistry
• Environmental Science

Background:

• Acetonitrile is a widely used industrial solvent.
• Its presence in the environment poses challenges due to potential toxicity.
• Microbial degradation is a key strategy for bioremediation of acetonitrile contamination.

Purpose of the Study:

• To isolate and identify bacteria capable of utilizing high concentrations of acetonitrile as a sole carbon source.
• To compare the growth and degradation capabilities of identified bacterial strains.
• To investigate the potential of these bacteria for bioremediation applications.

Main Methods:

• Isolation of acetonitrile-utilizing bacteria from environmental samples.
• Identification of bacterial isolates using standard microbiological techniques.
• Growth curve analysis to determine optimal growth conditions and rates.
• Acetonitrile degradation studies using radiolabeled acetonitrile and oxygen uptake measurements.

Main Results:

• Two bacterial species, Chromobacterium sp. and Pseudomonas aeruginosa, were identified.
• Both strains effectively utilized acetonitrile up to 600 mM as a sole carbon source.
• Pseudomonas aeruginosa exhibited slightly faster growth and degraded 57% of acetonitrile, compared to 43% by Chromobacterium sp.
• Higher acetonitrile concentrations inhibited bacterial growth and oxygen consumption.

Conclusions:

• Chromobacterium sp. and Pseudomonas aeruginosa are capable of metabolizing high concentrations of acetonitrile.
• These bacteria demonstrate potential for bioremediation of acetonitrile-contaminated environments.
• Further research can explore optimizing conditions for enhanced degradation efficiency.