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Marx R, Liu H, Yoon S, Xie D. CFD evaluation of hydrophobic feedstock bench-scale fermenters for efficient high agitation volumetric mass transfer. Biotechnol J 2024; 19:e2300384. [PMID: 38403465 DOI: 10.1002/biot.202300384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 12/08/2023] [Accepted: 01/02/2024] [Indexed: 02/27/2024]
Abstract
A new biomanufacturing platform combining intracellular metabolic engineering of the oleaginous yeast Yarrowia lipolytica and extracellular bioreaction engineering provides efficient bioconversion of plant oils/animal fats into high-value products. However, predicting the hydrodynamics and mass transfer parameters is difficult due to the high agitation and sparging required to create dispersed oil droplets in an aqueous medium for efficient yeast fermentation. In the current study, commercial computational fluid dynamic (CFD) solver Ansys CFX coupled with the MUSIG model first predicts two-phase system (oil/water and air/water) mixing dynamics and their particle size distributions. Then, a three-phase model (oil, air, and water) utilizing dispersed air bubbles and a polydispersed oil phase was implemented to explore fermenter mixing, gas dispersion efficiency, and volumetric mass transfer coefficient estimations (kL a). The study analyzed the effect of the impeller type, agitation speed, and power input on the tank's flow field and revealed that upward-pumping pitched blade impellers (PBI) in the top two positions (compared to Rushton-type) provided advantageous oil phase homogeneity and similar estimated kL a values with reduced power. These results show good agreement with the experimental mixing and kL a data.
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Affiliation(s)
- Richard Marx
- Department of Chemical Engineering, University of Massachusetts Lowell, Lowell, Massachusetts, USA
| | - Huolong Liu
- Department of Chemical Engineering, University of Massachusetts Lowell, Lowell, Massachusetts, USA
| | - Seongkyu Yoon
- Department of Chemical Engineering, University of Massachusetts Lowell, Lowell, Massachusetts, USA
| | - Dongming Xie
- Department of Chemical Engineering, University of Massachusetts Lowell, Lowell, Massachusetts, USA
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Microbial micro-tube culture system: A miniature bioreactor for controllable bubble-free oxygen supply based on high gas-permeability Teflon tube. Biochem Eng J 2023. [DOI: 10.1016/j.bej.2022.108789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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A Critical Aspect of Bioreactor Designing and Its Application for the Generation of Tissue Engineered Construct: Emphasis on Clinical Translation of Bioreactor. BIOTECHNOL BIOPROC E 2022. [DOI: 10.1007/s12257-021-0128-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Jang YS, Seong HJ, Kwon SW, Lee YS, Im JA, Lee HL, Yoon YR, Lee SY. Clostridium acetobutylicum atpG-Knockdown Mutants Increase Extracellular pH in Batch Cultures. Front Bioeng Biotechnol 2021; 9:754250. [PMID: 34760879 PMCID: PMC8573202 DOI: 10.3389/fbioe.2021.754250] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 10/11/2021] [Indexed: 11/24/2022] Open
Abstract
ATPase, a key enzyme involved in energy metabolism, has not yet been well studied in Clostridium acetobutylicum. Here, we knocked down the atpG gene encoding the ATPase gamma subunit in C. acetobutylicum ATCC 824 using a mobile group II intron system and analyzed the physiological characteristics of the atpG gene knockdown mutant, 824-2866KD. Properties investigated included cell growth, glucose consumption, production of major metabolites, and extracellular pH. Interestingly, in 2-L batch fermentations, 824-2866KD showed no significant difference in metabolite biosynthesis or cell growth compared with the parent ATCC 824. However, the pH value in 824-2866KD cultures at the late stage of the solventogenic phase was abnormally high (pH 6.12), compared with that obtained routinely in the culture of ATCC 824 (pH 5.74). This phenomenon was also observed in batch cultures of another C. acetobutylicum, BEKW-2866KD, an atpG-knockdown and pta-buk double-knockout mutant. The findings reported in this study suggested that ATPase is relatively minor than acid-forming pathway in ATP metabolism in C. acetobutylicum.
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Affiliation(s)
- Yu-Sin Jang
- Division of Applied Life Science (BK21), Department of Applied Life Chemistry, Institute of Agriculture and Life Science (IALS), Gyeongsang National University, Jinju, South Korea
| | - Hyeon Jeong Seong
- Division of Applied Life Science (BK21), Department of Applied Life Chemistry, Institute of Agriculture and Life Science (IALS), Gyeongsang National University, Jinju, South Korea
| | - Seong Woo Kwon
- Division of Applied Life Science (BK21), Department of Applied Life Chemistry, Institute of Agriculture and Life Science (IALS), Gyeongsang National University, Jinju, South Korea
| | - Yong-Suk Lee
- Division of Applied Life Science (BK21), Department of Applied Life Chemistry, Institute of Agriculture and Life Science (IALS), Gyeongsang National University, Jinju, South Korea
| | - Jung Ae Im
- Department of Chemical and Biomolecular Engineering (BK21 Plus Program), BioProcess Engineering Research Center, Institute for the BioCentury, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea
| | - Haeng Lim Lee
- Division of Applied Life Science (BK21), Department of Applied Life Chemistry, Institute of Agriculture and Life Science (IALS), Gyeongsang National University, Jinju, South Korea
| | - Ye Rin Yoon
- Division of Applied Life Science (BK21), Department of Applied Life Chemistry, Institute of Agriculture and Life Science (IALS), Gyeongsang National University, Jinju, South Korea
| | - Sang Yup Lee
- Department of Chemical and Biomolecular Engineering (BK21 Plus Program), BioProcess Engineering Research Center, Institute for the BioCentury, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea
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