Journal
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
Volume 28, Issue 7, Pages 2551-2558Publisher
SPRINGER
DOI: 10.1007/s11274-012-1063-9
Keywords
Butanol; ABE; Clostridium acetobutylicum XY16; Two-stage controlled-pH strategy; Reducing power
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Funding
- State Key Laboratory of Materials-Oriented Chemical Engineering Foundation of Nanjing University of Technology and Commonweal research of CAF [201004001]
- 973'' program of China [2011CB707405]
- National Natural Science Foundation of China [21106067]
- 863'' Program of China [2011AA02A203]
- State Key Laboratory of Materials-Oriented Chemical Engineering Foundation of Nanjing University of Technology [ZK201001]
- Key University Science Research Project of Jiangsu Province [11KJA530001]
- Priority Academic Program Development of Jiangsu Higher Education Institutions, Qinglan project'' of Jiangsu province
- Jiangsu province Program for Changjiang Scholars
- Innovative Research Team in University [06-A-047]
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The effects of pH control on the process of acetone/butanol/ethanol (ABE) production in batch cultures of Clostridium acetobutylicum XY16 have been investigated. Based on the specific acid- and solvent-forming rates in batch fermentation at different pH values (from 4.3 to 6.0), a two-stage controlled-pH strategy was developed in which the pH was shifted from 5.5 to 4.9 after a dry cell weight of 0.5 g L-1 was achieved. By applying this strategy, the maximum ABE concentration and productivity reached 20.3 g L-1 and 0.63 g L-1 h (-1), and were significantly improved by 12.2 and 40.1 %, respectively, compared with the process with no pH control. In addition, reducing power capability was significantly enhanced by this strategy. The two-stage controlled-pH strategy was a convenient and rapid method for high intensity ABE production.
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