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Evaluation of the Biological Sampling Kit (BiSKit) for large-area surface sampling
Mark P Buttner1, Patricia Cruz, Linda D Stetzenbach
1Harry Reid Center for Environmental Studies, University of Nevada, Las Vegas, 4505 S. Maryland Parkway, Las Vegas, NV 89154-4009, USA. buttner@unlv.nevada.edu
Applied and Environmental Microbiology
|December 3, 2004
Summary
A new large-area surface sampler, the Biological Sampling Kit (BiSKit), significantly improves microbial detection sensitivity compared to traditional small-area swabs. Dry sampling with BiSKit proved more efficient for detecting Bacillus atrophaeus spores.
Area of Science:
- Microbiology
- Environmental Science
- Analytical Chemistry
Background:
- Current microbial surface sampling methods often target small areas, leading to low recovery rates and difficulty in pathogen detection.
- Small-area sampling necessitates numerous samples, increasing costs, labor, and analysis time.
Purpose of the Study:
- To evaluate a novel large-area biological surface sampling method, the Biological Sampling Kit (BiSKit).
- To compare the BiSKit's performance against traditional swabs for microbial contaminant detection.
- To assess the efficiency of wet versus dry sampling techniques with the BiSKit.
Main Methods:
- Experimental room trials using Bacillus atrophaeus spores as a simulant for Bacillus anthracis.
- Contamination of wood laminate and metal surfaces via aerosolization and settling.
- Sampling using BiSKit, cotton swabs, and foam swabs.
- Analysis via culturing, quantitative PCR, and immunoassay.
Main Results:
- The BiSKit, sampling 1 m², yielded up to 10-fold higher microbial concentrations than traditional methods.
- Dry sampling with BiSKit demonstrated higher efficiency (18.4%) compared to wet sampling (11.3%).
- Detection limits for B. atrophaeus on metal surfaces were 42 CFU/m² (wet) and 100.5 CFU/m² (dry).
Conclusions:
- Large-area sampling devices like BiSKit enhance detection sensitivity for microbial contaminants.
- The BiSKit offers advantages in efficiency and reduces the number of samples required.
- Dry sampling with BiSKit is a more effective method for surface microbial analysis.