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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±0.40gl –1 of propionic acid was attained at 120h in free-cell fermentation, whereas the PFB fermentation yielded 41.22±2.06gl –1 at 120h and faster cells growth was observed...
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