Related Experiment Videos
Characterization of Lactobacillus carbohydrate fermentation activity using immobilized cell technique
E Cortón1, M Piuri, F Battaglini
1Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 4 piso (1428) Buenos Aires, Argentina.
Biotechnology Progress
|February 9, 2000
Summary
A novel microbial bioreactor quantifies carbohydrate fermentation activity using immobilized Lactobacillus cells and pH monitoring. This method offers a rapid, cost-effective, and quantitative alternative to qualitative analyses for sugar metabolism studies.
Area of Science:
- Microbiology
- Biotechnology
- Analytical Chemistry
Background:
- Assessing carbohydrate fermentation activity is crucial for understanding microbial metabolism.
- Existing methods for determining carbohydrate fermentation patterns often yield only qualitative results.
- There is a need for rapid, quantitative, and cost-effective analytical tools for microbial fermentation analysis.
Purpose of the Study:
- To develop a microbial bioreactor for the quantitative determination of carbohydrate fermentation activity.
- To utilize immobilized Lactobacillus cells and pH monitoring for accurate fermentation analysis.
- To establish a method for quantifying fermentation capability relative to glucose.
Main Methods:
- Development of a microbial bioreactor using calcium alginate immobilized Lactobacillus cells.
- Coupling the bioreactor with a pH electrode for continuous monitoring of acid production.
- Optimization of pregrowth conditions, including high biomass and pregrowth in lactose to reduce catabolite repression.
- Monitoring acid production (pH variation) in response to different sugar solutions in a continuous flow-stopped flow system.
Main Results:
- The bioreactor successfully quantified carbohydrate fermentation activity based on pH variation (DeltamV/Deltat).
- Fermentation capability was expressed quantitatively relative to glucose (set at 100%).
- The method demonstrated simplicity, reduced analysis time, and lower costs compared to existing techniques.
- High biomass and specific pregrowth conditions were identified as necessary for optimal performance.
Conclusions:
- The developed microbial bioreactor provides a simple, rapid, and quantitative method for assessing carbohydrate fermentation activity.
- This tool is suitable for the rapid analysis of isolated microbial strains and for studying sugar metabolism modifications.
- The pH-based approach offers a significant advantage over qualitative methods for fermentation pattern analysis.