Abstract
Fed-batch propionic and acetic acid fermentations were performed in semi-defined laboratory medium and in corn steep liquor withPropionibacterium acidipropionici strain P9. On average, over four experiments, 34.5 g/l propionic acid and 12.8 g/l acetic acid were obtained in about 146 h in laboratory medium with 79 g/l glucose added over five feeding periods. The highest concentration of propionic acid, 45 g/l, was obtained when the glucose concentration was not allowed to drop to zero. In corn steep liquor 35 g/l propionic acid and 11 g/l acetic acid were produced in 108 h from 59.4 g/l total lactic acid provided as seven feedings of corn steep liquor. Extractive fed-batch fermentations were conducted in semi-defined medium using either flat-sheet-supported liquid membranes or hollow-fiber membrane extraction to remove organic acids from the culture medium. As operated during the course of the fermentation, these systems extracted 25% and 22% of the acetic acid and 36.5% and 44.5% of the propionic acid, respectively, produced in the fermentation. Total amounts of acids produced were about the same as in comparable nonextractive fermentations: 30–37 g/l propionic acid and 13 g/l acetic acid were produced in 150 h. Limitations on acid production can be attributed to limited substrate feed, not to failure of the extraction system.
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Journal paper J-16303 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa. Project 3122.
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Ozadali, F., Glatz, B.A. & Glatz, C.E. Fed-batch fermentation with and without on-line extraction for propionic and acetic acid production byPropionibacterium acidipropionici . Appl Microbiol Biotechnol 44, 710–716 (1996). https://doi.org/10.1007/BF00178607
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DOI: https://doi.org/10.1007/BF00178607