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Physiological effects of the addition of n-dodecane as an oxygen vector during steady-state Bacillus licheniformis thermophillic fermentations perturbed by a starvation period or a glucose pulse

Paper ID Volume ID Publish Year Pages File Format Full-Text
4327 221 2008 9 PDF Available
Title
Physiological effects of the addition of n-dodecane as an oxygen vector during steady-state Bacillus licheniformis thermophillic fermentations perturbed by a starvation period or a glucose pulse
Abstract

The effect of the presence of n-dodecane as a potential oxygen vector during oxygen-limited continuous cultures of a Bacillus strain was studied, under extreme nutrient supply conditions: glucose excess, limitation and starvation. The addition of n-dodecane to the aqueous phase of a mechanically agitated and aerated fermentation increased the kLa by up to 35%. The n-dodecane additions to Bacillus licheniformis cells during starvation (oxygen limitation with concomitant glucose starvation) caused a severe detrimental progressive change in cell physiological state with respect to cytoplasmic membrane polarisation and permeability which was mitigated against by alleviating either the oxygen limitation (by increasing the mean energy dissipation rate or by the addition of n-dodecane as an oxygen vector) or by alleviating the carbon limitation (by resuming the carbon feed or by the addition of a glucose pulse). Further that during periods of excess glucose (glucose pulse) a much higher kLa was required to prevent the onset of anaerobic mixed acid fermentation than could be provided by the addition of n-dodecane alone. n-Dodecane can be used to increase the kLa when added in sufficient quantities to the aqueous phase of a mechanically agitated and aerated bioreactor but the magnitude of this increase is process and vessel geometry specific.

Keywords
Bacillus licheniformis; n-Dodecane; Multi-parameter flow cytometry; Oxygen vector; Steady-state; Termophilic wastewater treatment
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Physiological effects of the addition of n-dodecane as an oxygen vector during steady-state Bacillus licheniformis thermophillic fermentations perturbed by a starvation period or a glucose pulse
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 42, Issue 3, 1 December 2008, Pages 208–216
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us