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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| Institution: | 1. Department of Mathematics Education, Kyungnam University, Changwon, Gyeongnam 51767, Republic of Korea;2. Department of Mathematics and Informatics, Thainguyen University, Thainguyen, Vietnam;1. Faculty of Computer Systems & Software Engineering, Universiti Malaysia Pahang, Kuantan, Pahang 26300, Malaysia;2. Institute For Artificial Intelligence and Big Data, Universiti Malaysia Kelantan, City Campus, Pengkalan Chepa, Kota Bharu, Kelantan 16100, Malaysia;3. Faculty of Bioengineering and Technology, Universiti Malaysia Kelantan, Jeli Campus, Lock Bag 100, Jeli, Kelantan 17600, Malaysia;4. Artificial Intelligence and Bioinformatics Research Group, School of Computing, Universiti Teknologi Malaysia, Skudai, Johor 81310, Malaysia;5. Department of Electronics, Information and Communication Engineering, Osaka Institute of Technology, Osaka 535-8585, Japan;6. Biomedical Research Institute of Salamanca/BISITE Research Group, University of Salamanca, Calle Espejo s/n, Salamanca 37008, Spain |
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| 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. |
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