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Cell surface analysis techniques: What do cell preparation protocols do to cell surface properties?
R S Pembrey1, K C Marshall, R P Schneider
1School of Microbiology and Immunology, University of New South Wales, Sydney, 2052, Australia.
Applied and Environmental Microbiology
|July 2, 1999
Summary
Cell surface analysis methods significantly alter microbial properties. Researchers found that common preparation techniques like centrifugation and drying impact cell surface characteristics and viability, necessitating careful method selection for accurate in situ analysis.
Area of Science:
- Microbiology
- Biophysics
- Cell Biology
Background:
- Cell surface analysis is crucial for understanding microbial behavior.
- Standard preparation techniques include centrifugation, media changes, desiccation, and hydrophobicity assays.
- These procedures may inadvertently alter cell surface properties.
Purpose of the Study:
- To systematically investigate the effects of common cell preparation methods on microbial surface properties.
- To assess the impact of these procedures on cell viability and structural integrity.
- To evaluate different model organisms for their susceptibility to manipulation techniques.
Main Methods:
- Investigated effects of centrifugation, media washing/resuspension, air drying, freeze-drying, and hydrocarbon contact.
- Assessed changes in electrophoretic mobility, adhesion, Sepharose column affinity, structural integrity, and cell viability.
- Utilized model organisms: Psychrobacter sp. strain SW8, Escherichia coli, and Staphylococcus epidermidis.
Main Results:
- All manipulation procedures significantly modified physicochemical properties, with varying susceptibility among organisms.
- Hydrocarbon contact caused considerable surface disruption; air and freeze-drying rendered most cells non-culturable.
- High-speed centrifugation altered surface parameters, and washing medium salt concentration strongly influenced results.
Conclusions:
- Standard cell preparation methods critically affect measured surface properties, potentially misrepresenting in situ conditions.
- Method selection must be microorganism-specific to ensure accurate representation of native cell surfaces.
- There is a critical need for novel, non-destructive, minimally invasive in situ cell surface analysis techniques.