Research Article
PHA Productivity and Yield of Ralstonia eutropha When Intermittently or Continuously Fed a Mixture of Short Chain Fatty Acids
Table 5
Comparison of combined short fatty acid feeding of Ralstonia eutropha in shake flasks.
| Parameters | Volatile fatty acid | Acetic (5 g L−1) | Butyric (5 g L−1) | Lactic (8 g L−1) | Propionic (5 g L−1) |
| Maximum cell population (cfu mL−1) | 5.70 109a | 6.17 109ab | 5.32 109a | 6.67 109b | Fermentation efficiency (%) | 70.6a | 95.6b | 70.7a | 68.6a | Acid utilization rate (g L−1 h−1) | 0.048a | 0.041a | 0.080b | 0.046a | PHA concentration (g L−1) | 2.9ab | 4.6a | 2.4b | 4.3a | Cell dry weight (g L−1) | 9.9ab | 14.5b | 6.0a | 14.7b | PHA productivity (g L−1 h−1) | 0.024ab | 0.037a | 0.020b | 0.036a | PHA content (%) | 29.2a | 31.9a | 30.7a | 29.3a |
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a,bMeans within column not sharing common superscript differ significantly (P < 0.05).
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