Related Experiment Videos
Fluorescence assessment of Lactococcus lactis viability
C J Bunthof1, S van den Braak, P Breeuwer
1Department of Food Technology and Nutrition Sciences, Wageningen University and Research Centre, The Netherlands.
International Journal of Food Microbiology
|May 3, 2000
Summary
Rapidly assess lactic acid bacteria (LAB) viability with a new fluorescence assay. This method offers a faster, more informative alternative to traditional techniques for dairy applications and fermentation research.
Area of Science:
- Microbiology
- Biotechnology
- Food Science
Background:
- Lactic acid bacteria (LAB) are crucial for dairy and fermentation industries.
- Traditional methods for assessing LAB viability are time-consuming and limited.
- Fluorescence techniques offer potential for rapid physiological assessment.
Purpose of the Study:
- To evaluate traditional and fluorescence assays for assessing the physiological state of stressed L. lactis subsp. lactis ML3.
- To develop a rapid and reliable method for determining LAB reproduction and acidification capacity.
Main Methods:
- Exposure of L. lactis subsp. lactis ML3 to various stress conditions.
- Application of traditional plate counts and carboxyfluorescein (cF) labeling.
- Development and application of a two-step assay combining cF labeling and lactose-energized efflux.
Main Results:
- Carboxyfluorescein (cF) labeling alone did not always correlate with plate counts after stress exposure.
- The novel two-step assay (cF labeling + lactose-energized efflux) showed strong agreement with traditional methods.
- The combined assay effectively indicated the reproduction and acidification capacity of stressed LAB.
Conclusions:
- A novel two-step fluorescence assay provides a rapid and accurate assessment of stressed LAB physiology.
- This assay overcomes limitations of traditional methods and single-step fluorescence techniques.
- The developed method has significant potential for applications in dairy research and industrial fermentations.