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  4. Imaging Flow Cytometry Demonstrates Physiological and Morphological Diversity within Treated Probiotic Bacteria Groups
 
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Imaging Flow Cytometry Demonstrates Physiological and Morphological Diversity within Treated Probiotic Bacteria Groups

Type
Journal article
Language
English
Date issued
2023
Author
Kiepś, Jakub
Juzwa, Wojciech 
Dembczyński, Radosław 
Faculty
Wydział Nauk o Żywności i Żywieniu
Journal
International Journal of Molecular Sciences
ISSN
1661-6596
DOI
10.3390/ijms24076841
Web address
http://www.mdpi.com/1422-0067/24/7/6841
Volume
24
Number
7
Pages from-to
art. 6841
Abstract (EN)
Probiotic bacteria can be introduced to stresses during the culturing phase as an alternative to the use of protectants and coating substances during drying. Accurate enumeration of the bacterial count in a probiotic formulation can be provided using imaging flow cytometry (IFC). IFC overcomes the weak points of conventional, commonly used flow cytometry by combining its statistical power with the imaging content of microscopy in one system. Traditional flow cytometers only collect the fluorescence signal intensities, while IFC provides many more steps as it correlates the data on the measured parameters of fluorescence light with digitally processed images of the analyzed cells. As an alternative to standard methods (plate cell counts and traditional flow cytometry) IFC provides additional insight into the physiology and morphology of the cell. The use of complementary dyes (RedoxSensorTM Green and propidium iodide) allows for the designation of groups based on their metabolic activity and membrane damage. Additionally, cell sorting is incorporated to assess each group in terms of growth on different media (MRS-Agar and MRS broth). Results show that the groups with intermediate metabolic activity and some degree of cellular damage correspond with the description of viable but nonculturable cells.
Keywords (EN)
  • viability

  • fluid bed drying

  • lactic acid bacteria

  • stress factors

  • quality control

  • rapid assessment

License
cc-bycc-by CC-BY - Attribution
Open access date
April 6, 2023
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