Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
681155 | Bioresource Technology | 2013 | 8 Pages |
Abstract
Propionibacterium freudenreichii subsp. shermanii can ferment glucose and glycerol to propionic acid with acetic and succinic acids as two by-products. Propionic acid production from glucose was relatively fast (0.19Â g/LÂ h) but gave low product yield (â¼0.39Â g/g) and selectivity (P/A: â¼2.6; P/S: â¼4.8). In contrast, glycerol with a more reduced state gave a high propionic acid yield (â¼0.65Â g/g) and selectivity (P/A: â¼31; P/S: â¼11) but low productivity (0.11Â g/LÂ h). On the other hand, co-fermentation of glycerol and glucose at an appropriate mass ratio gave both a high yield (0.54-0.65Â g/g) and productivity (0.18-0.23Â g/LÂ h) with high product selectivity (P/A: â¼14; P/S: â¼10). The carbon flux distributions in the co-fermentation as affected by the ratio of glycerol/glucose were investigated. Finally, co-fermentation with cassava bagasse hydrolysate and crude glycerol in a fibrous-bed bioreactor was demonstrated, providing an efficient way for economic production of bio-based propionic acid.
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Authors
Zhongqiang Wang, Shang-Tian Yang,