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Enhanced propionic acid production from Jerusalem artichoke hydrolysate by immobilized Propionibacterium acidipropionici in a fibrous-bed bioreactor.
MedLine Citation:
PMID:  22228298     Owner:  NLM     Status:  Publisher    
Propionic acid is an important chemical that is widely used in the food and chemical industries. To enhance propionic acid production, a fibrous-bed bioreactor (FBB) was constructed and Jerusalem artichoke hydrolysate was used as a low-cost renewable feedstock for immobilized fermentation. Comparison of the kinetics of immobilized-cell fermentation using the FBB with those of fed-batch free-cell fermentation showed that immobilized-cell fermentation gave a much higher propionic acid concentration (68.5 vs. 40.6 g/L), propionic acid yield (0.434 vs. 0.379 g/g) and propionic acid productivity (1.55 vs. 0.190 g/L/h) at pH 6.5. Furthermore, repeated batch fermentation, carried out to evaluate the stability of the FBB system, showed that long-term operation with a high average propionic acid yield of 0.483 g/g, high productivity of 3.69 g/L/h and propionic acid concentration of 26.2 g/L were achieved in all eight repeated batches during fermentation for more than 200 h. It is thus concluded that the FBB culture system can be utilized to realize the economical production of propionic acid from Jerusalem artichoke hydrolysate during long-term operation.
Ze-Xin Liang; Lin Li; Shuang Li; You-Hua Cai; Shang-Tian Yang; Ju-Fang Wang
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-1-7
Journal Detail:
Title:  Bioprocess and biosystems engineering     Volume:  -     ISSN:  1615-7605     ISO Abbreviation:  -     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-1-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101088505     Medline TA:  Bioprocess Biosyst Eng     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, People's Republic of China.
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