Abstract
We endeavored to develop a method for viability determination of solventogenic clostridia and to apply it for monitoring acetone–butanol–ethanol (ABE) fermentation. Six fluorescent probes (propidium iodide [PI], ethidium bromide, fluorescein diacetate, carboxyfluorescein diacetate [cFDA], rhodamine 123, bis-(1,3-dibutylbarbituric acid)trimethine oxonol [BOX]) were tested in order to distinguish two subpopulations of live and dead clostridial cells in suspension. Three of them were found to be appropriate (PI, BOX and cFDA) for this purpose. Developed fluorescent staining methods were applied to batch fermentation processes of Clostridium pasteurianum and C. beijerinckii carried out in a laboratory bioreactor under anaerobic conditions. Whereas PI was found to be applicable to both strains, BOX was convenient only for viability determination of C. pasteurianum. Although cFDA can distinguish two cell subpopulations in suspension, it was found to be unsuitable for viability determination under tested conditions, since it reflected more variable esterase activity during sporulation cell cycle than viability. Flow cytometry in combination with convenient fluorescent probe has been proved to be a valuable tool for viability determination. We assume this rapid and simple method can help to obtain more complex and precise information about ABE fermentation.
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Abbreviations
- ABE:
-
Acetone–butanol–ethanol
- BOX:
-
Bis-(1,3-dibutylbarbituric acid)trimethine oxonol
- FDA:
-
Carboxyfluorescein diacetate
- EtBr:
-
Ethidium bromide
- FC:
-
Flow cytometry
- cFDA:
-
Fluorescein diacetate
- PI:
-
Propidium iodide
- RH 123:
-
Rhodamine 123
- VBNC:
-
Viable but nonculturable cells
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Acknowledgement
This research was supported by projects No. FR-TI1/218 of the Ministry of Industry and Trade of the Czech Republic; No. MSM6046137305 and by the specific university research project MSMT No. 21/2011 of the Ministry of Education, Youth and Sport of the Czech Republic; and No. TEO1020080 of Technology Agency of the Czech Republic (Copetence Centres).
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Linhová, M., Branská, B., Patáková, P. et al. Rapid flow cytometric method for viability determination of solventogenic clostridia. Folia Microbiol 57, 307–311 (2012). https://doi.org/10.1007/s12223-012-0131-8
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DOI: https://doi.org/10.1007/s12223-012-0131-8