Volatile metabolites from indoor molds grown on media containing wood constituents

Area of Science:

• Environmental microbiology
• Building science
• Mycology

Background:

• Volatile mold metabolites are utilized for detecting mold growth in indoor environments.
• Wood is a prevalent building material, often colonized by indoor molds.
• Understanding mold-wood interactions is crucial for accurate microbial monitoring.

Purpose of the Study:

• To investigate the substrate specificities of common indoor mold species on major wood constituents.
• To determine if different mold species produce distinct volatile metabolites when grown on wood components.
• To assess the reliability of volatile metabolite detection for specific indoor mold species.

Main Methods:

• Culturing three indoor mold species (Aspergillus versicolor, Penicillium chrysogenum, P. palitans) on substrates containing cellulose, xylan, and lignin.
• Characterizing microbial volatile organic compounds (MVOCs) using thermal desorption/gas chromatography/mass spectrometry.
• Analyzing mold growth and volatile metabolite production in relation to specific wood constituents.

Main Results:

• Significant variations in growth and volatile metabolite production were observed among the tested mold species.
• Penicillium chrysogenum and P. palitans displayed complementary substrate specificities for cellulose and xylan.
• Aspergillus versicolor did not produce characteristic MVOCs when cultured on media with wood constituents.

Conclusions:

• Mold species demonstrate differential affinities for wood components, impacting their volatile metabolite profiles.
• The detection of microbial volatile organic compounds may not be universally reliable for all indoor mold species, particularly Aspergillus versicolor.
• Current methods for detecting mold growth via volatile metabolites may require refinement to account for species-specific responses to building materials.