Fermentation parameters of Peptostreptococcus productus on gaseous substrates (CO,H2/CO2) |
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Authors: | Jose L. Vega Vicki L. Holmberg Edgar C. Clausen James L. Gaddy |
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Affiliation: | (1) Department of Chemical Engineering, University of Arkansas, 72701 Fayetteville, AR, USA |
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Abstract: | Intrinsic growth and substrate uptake parameters were obtained for Peptostreptococcus productus, strain U-1, using carbon monoxide as the limiting substrate. A modified Monod model with substrate inhibition was used for modeling. In addition, a product yield of 0.25 mol acetate/mol CO and a cell yield of 0.034 g cells/g CO were obtained. While CO was found to be the primary substrate, P. productus is able to produce acetate from CO2 and H2, although this substrate could not sustain growth. Yeast extract was found to also be a growth substrate. A yield of 0.017 g cell/g yeast extract and a product yield of 0.14 g acetate/g yeast extract were obtained. In the presence of acetate, the maximum specific CO uptake rate was increased by 40% compared to the maximum without acetate present. Cell replication was inhibited at acetate concentrations of 30 g/l. Methionine was found to be an essential nutrient for growth and CO uptake by P. productus. A minimum amount of a complex medium such as yeast extract (0.01%) is, however, required. |
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Keywords: | Peptostreptococcus products Growth rates Specific uptake rates Yields Kinetic parameters Yeast extract Acetate Carbon monoxide Methionine Mass transfer |
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