Production of propionic acid using a xylose utilizingPropionibacterium |
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Authors: | M J T Carrondo J P S G Crespo M J Moura |
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Institution: | (1) Biochemical Engineering Laboratory, Department of Chemistry, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2825 Monte da Caparica, Portugal |
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Abstract: | The kinetics ofP. acidipropionici (ATCC25562), a xylose-utilizing rumen microorganism, was studied to assess its use for propionic acid production from wood
hydrolyzates.
Propionic acid has been shown to have a stronger inhibitory effect than acetic acid, with the undissociated acid form being
responsible for the majority of the inhibitory effect. Thus, in batch tests with pH controlled at 6.0, the propionic acid
concentration reaches 25 g/L and the acetic acid 7 g/L. Xylose uptake rate is dependent on the specific growth rate and glucose
concentration.
An immobilized cell columnar reactor at very high product yields (80%) proved adequate for propionic production. At cell concentrations
of 95 g/L with high product concentration, volumetric productivities of 2.7 g/L·h were obtained in ultrafiltration cell recycle
systems. |
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Keywords: | Propionic acid production fromPropionibacterium acidi-propionici xylose utilization kinetics of immobilized cell system (ICR) production of propionic acid by tangential ultrafiltration cell recycle reactor (UFR) production of propionic acid by high cell concentration system for propionic acid production |
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