Journal
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
Volume 166, Issue 8, Pages 1896-1907Publisher
SPRINGER
DOI: 10.1007/s12010-012-9614-y
Keywords
Acetone-butanol-ethanol; Fermentation; Cane molasses; Clostridium saccharobutylicum; Semicontinuous
Funding
- New Century Excellent Talents in University [NCET-11-0658]
- Program of Introducing Talents of Discipline to Universities [111-2-06]
- Jiangsu Higher Education Institutions
- Green Biologics Ltd (Oxfordshire, UK)
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Clostridium acetobutylicum strains used in most Chinese ABE (acetone-butanol-ethanol) plants favorably ferment starchy materials like corn, cassava, etc., rather than sugar materials. This is one major problem of ABE industry in China and significantly limits the exploitation of cheap waste sugar materials. In this work, cane molasses were utilized as substrate in ABE production by Clostridium saccharobutylicum DSM 13864. Under optimum conditions, total solvent of 19.80 g/L (13.40 g/L butanol) was reached after 72 h of fermentation in an Erlenmeyer flask. In a 5-L bioreactor, total solvent of 17.88 g/L was attained after 36 h of fermentation, and the productivity and yield were 0.50 g/L/h and 0.33 g ABE/g sugar consumption, respectively. To further enhance the productivity, a two-stage semicontinuous fermentation process was steadily operated for over 8 days (205 h, 26 cycles) with average productivity (stage II) of 1.05 g/L/h and cell concentration (stage I) of 7.43 OD660, respectively. The average batch fermentation time (stage I and II) was reduced to 21-25 h with average solvent of 15.27 g/L. This study provides valuable process data for the development of industrial ABE fermentation process using cane molasses as substrate.
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