[Spectrophometric analysis of volatile compounds in microorganisms]

Area of Science:

• Microbiology
• Analytical Chemistry
• Biochemistry

Background:

• Detecting microbial growth and metabolic activity is crucial in various scientific fields.
• Existing methods for microbial detection can be time-consuming or require direct contact.
• Understanding microbial volatile compound production is key to developing novel detection strategies.

Purpose of the Study:

• To develop a rapid, contactless spectrophotometric method for microorganism detection.
• To assess the method's capability for monitoring bacterial growth.
• To differentiate fungal mutants with altered nitrogen metabolism from wild-type strains.

Main Methods:

• A modified spectrophotometric technique was employed.
• The method relies on detecting volatile compounds excreted or absorbed by microorganisms.
• Contactless monitoring of bacterial growth was performed at concentrations above 10(7) cells/ml.

Main Results:

• The spectrophotometric method demonstrated rapid detection of microorganisms.
• Contactless monitoring of bacterial growth was achieved.
• The method successfully discriminated between wild-type Neurospora crassa and mutants deficient in nitrogen metabolism.

Conclusions:

• The modified spectrophotometric method offers a rapid and contactless approach for microbial detection.
• This technique is effective for monitoring bacterial growth and analyzing metabolic variations in fungi.
• Nitrite and nitrate reductase enzymes, regulated by nit-2 and nit-6 genes, are likely involved in the production of volatile compounds in Neurospora crassa.