期刊
BIORESOURCE TECHNOLOGY
卷 102, 期 10, 页码 6141-6146出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.02.087
关键词
Propionic acid; Cane molasses; Waste propionibacterium cell; Plant fibrous-bed bioreactor; Propionibacterium freudenreichii CCTCC M207015
资金
- National Basic Research Program of China (973) [2007CB714304]
- National Nature Science Foundation of China [21006050]
- Specialized Research Fund for the Doctoral Program of Higher Education [20103221120007]
- China Postdoctoral Science Foundation [20100471325]
- Natural Science Foundation of the Jiangsu [BK2010550]
Propionic acid production by Propionibacterium freudenreichii from molasses and waste propionibacterium cells was studied in plant fibrous-bed bioreactor (PFB). With non-treated molasses as carbon source, 12.69 +/- 0.40 g l(-1) of propionic acid was attained at 120 h in free-cell fermentation, whereas the PFB fermentation yielded 41.22 +/- 2.06 g l(-1) at 120 h and faster cells growth was observed. In order to optimize the fermentation outcomes, fed-batch fermentation was performed with hydrolyzed molasses in PFB, giving 91.89 +/- 4.59 g l(-1) of propionic acid at 254 h. Further studies were carried out using hydrolyzed waste propionibacterium cells as substitute nitrogen source, resulting in a propionic acid concentration of 79.81 +/- 3.99 g l(-1) at 302 h. The present study suggests that the low-cost molasses and waste propionibacterium cells can be utilized for the green and economical production of propionic acid by P. freudenreichii. (C) 2011 Elsevier Ltd. All rights reserved.
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