Improved techniques for sampling airborne fungal particles in highly contaminated environments

Area of Science:

• Environmental microbiology
• Air quality monitoring

Background:

• Accurate collection of airborne fungi is crucial for environmental and health assessments.
• Traditional methods like Nuclepore filters have limitations in high concentration sampling.

Purpose of the Study:

• To compare the efficiency of Nuclepore filters with modified slit samplers for airborne fungi collection.
• To evaluate the performance of a personal cascade impactor against Nuclepore filters.

Main Methods:

• Nuclepore filters were compared with slit samplers using agar or glycerol/gelatin collection gels.
• Slit sampler gels were homogenized or melted, diluted, and cultured.
• A personal cascade impactor (Sierra) with glycerol-moistened filters was tested against Nuclepore filters.

Main Results:

• No significant difference in trapping efficiency was found between Nuclepore filters and slit samplers with glycerol/gelatin gels (10^3–10^8 cfu/m³).
• Agar gels showed lower efficiency, likely due to water evaporation.
• The personal cascade impactor demonstrated similar trapping efficiency to the Nuclepore filter method.

Conclusions:

• Modified slit samplers using glycerol/gelatin gels are a viable alternative to Nuclepore filters for high airborne fungi concentrations.
• Personal cascade impactors offer comparable performance to Nuclepore filters for airborne fungi sampling.