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Table 1 Propionic acid production under continuous operation with cell recycling performed at different dilution rates (D), C- (glycerol) and N-source (yeast extract) concentrations

From: Membrane-based continuous fermentation with cell recycling for propionic acid production from glycerol by Acidipropionibacterium acidipropionici

Dilution rate (D)a

0.05 1/h

0.025 1/h

Glycerol (g/L) : YE (g/L)b

22.60:10

43.27:10

51.40:10

64.50:10

64.50:20

62.90:20

62.90:10

70.00:10

P (g/L)

14.78 ± 0.08

14.45 ± 0.40

19.35 ± 0.40

16.94 ± 0.34

36.25 ± 1.47

27.82 ± 0.48

18.77 ± 0.20

24.27 ± 0.12

X (gCDW/L)

23.44 ± 0.43

58.90 ± 0.84

61.57 ± 8.97

49.12 ± 7.99

90.09 ± 1.44

63.56 ± 0.35

77.49 ± 3.79

74.81 ± 3.84

QP (g/L/h)

0.73 ± 0.00

0.72 ± 0.02

0.98 ± 0.01

0.85 ± 0.02

1.82 ± 0.09

0.69 ± 0.01

0.47 ± 0.01

0.62 ± 0.02

YP/S (gP/gS)

0.65 ± 0.02

0.33 ± 0.01

0.38 ± 0.01

0.37 ± 0.02

0.75 ± 0.06

0.57 ± 0.01

0.30 ± 0.01

0.41 ± 0.02

  1. Production of propoinic acid from glycerol under continuous mode of operation with cell recycling using tangential flow ceramic membrane. aDifferent dilution rates were tested with bdifferent glycerol and yeast extract (YE) concentrations in the feeding solution. Biomass (X), propionic acid (P) concentrations, volumetric productivity (Qp) and product yield (YP/S) are presented
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Microbial Cell Factories

ISSN: 1475-2859

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