Investigating the Detrimental Effects of Low Pressure Plasma Sterilization on the Survival of Bacillus subtilis Spores Using Live Cell Microscopy
November 30th, 2017
This protocol illustrates the important consecutive steps required to assess the relevance of monitoring vitality parameter and DNA repair processes in reviving Bacillus subtilis spores after treatment with low pressure plasma by tracking fluorescence-labelled DNA repair proteins via time-resolved confocal microscopy and scanning electron microscopy.
Overview
This protocol illustrates the important consecutive steps required to assess the relevance of monitoring vitality parameters and DNA repair processes in reviving Bacillus subtilis spores after treatment with low pressure plasma. The techniques employed include time-resolved confocal microscopy and scanning electron microscopy.
Key Study Components
Area of Science
- Microbial Inactivation
- Sterilization Techniques
- DNA Repair Mechanisms
Background
- Bacillus subtilis spores are used as biological indicators.
- Low pressure plasma treatment can affect microbial vitality.
- Understanding DNA repair is crucial for assessing spore revival.
- Combining microscopy techniques enhances analysis accuracy.
Purpose of Study
- To visualize and monitor vitality parameters in Bacillus subtilis spores.
- To analyze the effects of low pressure plasma treatment.
- To verify the impact of treatment on DNA repair processes.
Methods Used
- Time-resolved confocal fluorescence microscopy.
- Scanning electron microscopy.
- Spore production using Shafer sporulation medium.
- Centrifugation and purification of spores.
Main Results
- Successful visualization of DNA repair processes in spores.
- Identification of vitality parameters post-treatment.
- Demonstration of the detrimental effects of low pressure plasma.
- Combination of methods provides comprehensive insights.
Conclusions
- The study enhances understanding of microbial inactivation.
- It provides a framework for future research on spore revival.
- Combining microscopy techniques is beneficial for analysis.
Frequently Asked Questions
Executive Industry Relevance
Quantitative assessment of low pressure plasma sterilization on Bacillus subtilis spores provides critical insight into microbial inactivation mechanisms relevant for biopharma manufacturing and contamination control. Live cell microscopy and DNA repair tracking enable predictive evaluation of sterilization efficacy and biological risk. These methods inform early-stage de-risking and support robust pipeline decisions for sterilization technology adoption.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables mechanistic interrogation of microbial inactivation pathways at the single-cell level.
- Supports biological de-risking by quantifying DNA repair responses post-sterilization.
- Provides predictive confidence in sterilization impact on resistant biological indicators.
Screening & Assay Development
- Facilitates preparation of validated spore monolayers for reproducible downstream analysis.
- Standardizes quantitative germination and outgrowth assays for comparative evaluation.
- Enables high-content screening of sterilization parameters and biological outcomes.
Translational & Preclinical Research
- Aligns microbial inactivation data with translational contamination control strategies.
- Supports continuity from discovery-stage sterilization assessment to preclinical process validation.
- Provides mechanistic de-risking for adoption of novel sterilization modalities.
Pipeline & Workflow Integration
This workflow integrates from early discovery of sterilization mechanisms through screening of process parameters to translational contamination control in bioprocessing environments.
- Discovery Biology: Quantifies DNA repair and germination as mechanistic readouts of sterilization efficacy.
- Screening: Delivers reproducible, quantitative outputs for comparing plasma exposure durations and biological responses.
- Analytics: Provides colony-forming unit (CFU) counts and live cell imaging data for robust statistical analysis.
- Translational Research: Informs risk-adjusted advancement of sterilization technologies for bioprocessing and clinical applications.
- Enterprise Reuse: Establishes a standardized platform for evaluating sterilization impact across diverse biological indicators.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence in sterilization outcomes and reduces mechanistic ambiguity.
- Operational Value: Enhances standardization, reproducibility, and scalability of microbial inactivation assays.
- Strategic Value: Supports informed go/no-go decisions for sterilization technology adoption and process optimization.
- Portfolio Impact: Enables risk-adjusted prioritization of sterilization modalities for manufacturing and contamination control.
Implementation Considerations
- Requires expertise in live cell and confocal fluorescence microscopy.
- Demands access to plasma reactors, imaging platforms, and analytical infrastructure.
- Necessitates rigorous cross-team standardization of spore preparation and assay protocols.
- Adaptation may be needed for different microbial or eukaryotic model systems.
- Potential limitations include spore aggregation, sample contamination, and imaging-induced germination inhibition.
Biopharma FAQs
Chapters in this video
0:05
Title
0:55
Bacillus subtilis Spore Production and Purification and Sample Preparation of Aerosol-deposited Bacillus subtilis Spores
3:03
Low Pressure Plasma Treatment and Recovery and Evaluation of Spore Survival
5:10
Live Cell Microscopy, Tracking of DNA Repair Processes in Germinating Spores, and Scanning Electron Microscopy
7:27
Results: Bacillus subtilis Spore Survival After Low Pressure Plasma Sterilization
9:02
Conclusion
