NDLI: Adaptation dynamics of Clostridium butyricum in high 1,3-propanediol content media

Content Provider	Springer Nature Link
Author	Chatzifragkou, Afroditi Aggelis, George Gardeli, Chryssavgi Galiotou Panayotou, Maria Komaitis, Michael Papanikolaou, Seraphim
Copyright Year	2012
Abstract	Aim of the present study was to evaluate the effect of exogenous additions of 1,3-propanediol (1,3-PDO) on microbial growth and metabolites production of Clostridium butyricum VPI 1718 strain, during crude glycerol fermentation. Preliminary batch cultures in anaerobic Duran bottles revealed that early addition of 1,3-PDO caused growth cessation in rather low quantities (15 g/L), while 1,3-PDO additions during the middle exponential growth phase up to 70 g/L resulted in an almost linear decrease of the specific growth rate (μ), accompanied by reduced glycerol assimilation, with substrate consumption being used mainly for energy of maintenance requirements. During batch trials in a 3-L bioreactor, the strain proved able to withstand more than 70 g/L of both biologically produced and externally added 1,3-PDO, whereas glycerol assimilation and metabolite production were carried on at a lower rate. Adaptation of the strain in high 1,3-PDO concentration environments was validated during its continuous cultivation with pulses of 1,3-PDO in concentrations of 31 and 46 g/L, where no washout phenomena were noticed. As far as C. butyricum cellular lipids were concerned, during batch bioreactor cultivations, 1,3-PDO addition was found to favor the biosynthesis of unsaturated fatty acids. Also, fatty acid composition was studied during continuous cultures, in which additions of 1,3-PDO were performed at steady states. Lipids were globally more saturated compared to batch cultures, while by monitoring of the transitory phases, it was noticed that the gradual diol washout had an evident impact in the alteration of the fatty acid composition, by rendering them more unsaturated.
Starting Page	1541
Ending Page	1552
Page Count	12
File Format	PDF
ISSN	01757598
Journal	Applied Microbiology and Biotechnology
Volume Number	95
Issue Number	6
e-ISSN	14320614
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-03-29
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Clostridium butyricum 1,3-Propanediol Crude glycerol Cellular lipids Biotechnology Microbiology Microbial Genetics and Genomics
Content Type	Text
Resource Type	Article
Subject	Medicine Applied Microbiology and Biotechnology Biotechnology

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