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Sampling of biological particles

G Blomquist1

  • 1National Institute of Occupational Health, Analytical Chemistry Division, Umeå, Sweden.

The Analyst
|January 1, 1994
PubMed
Summary
This summary is machine-generated.

Sampling methods for airborne fungal spores and bacteria depend on workplace conditions and microbial levels. Microscopy techniques, particularly scanning electron microscopy, provide higher counts than cultivation methods for accurate biological particle analysis.

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Area of Science:

  • Environmental microbiology
  • Air quality monitoring
  • Bioaerosol science

Background:

  • Airborne biological particles, primarily fungal spores and bacteria, are ubiquitous in indoor environments.
  • Sampling strategies and analysis methods are crucial for accurate assessment of microbial exposure.
  • Environmental factors like location, season, and workplace activity significantly influence bioaerosol levels.

Purpose of the Study:

  • To review sampling strategies and analysis techniques for airborne biological particles.
  • To highlight the influence of environmental factors on sampling outcomes.
  • To compare different analytical methods for quantifying airborne microorganisms.

Main Methods:

  • Review of various sampling equipment including slit samplers, cascade impactors, multistage impingers, polycarbonate filters, and cyclones.

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  • Comparison of analytical techniques: microscopy (scanning electron microscopy, epifluorescence microscopy with Acridine Orange staining) and cultivation.
  • Evaluation of sample preparation methods, including suspension of particles in liquid.

    • Main Results:

    • Sampling effectiveness is highly dependent on the environment, season, and workplace activity.
    • For low concentrations (< 10^6 microorganisms/m³), slit samplers, cascade impactors, and impingers are suitable.
    • High concentrations (> 10^6 microorganisms/m³) necessitate alternative methods like filter sampling or cyclones to avoid sampler overload.
    • Microscopic analysis, especially scanning electron microscopy, yields higher counts than cultivation.
    • Liquid suspension aids in observing single spores by breaking down aggregates.

    Conclusions:

    • The choice of sampling strategy and equipment must be tailored to the specific environment and expected microbial load.
    • Analytical methods significantly impact the quantitative results, with direct microscopy offering higher sensitivity.
    • Understanding particle behavior during sample preparation is essential for accurate bioaerosol assessment.