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Table 2 Summary of the process parameters of different foam-free processes

From: Foam-free production of Surfactin via anaerobic fermentation of Bacillus subtilis DSM 10T

  Chtioui et al. 2012 Coutte et al. 2010 The current study Willenbacher et al. 2014
Surfactin producer Bacillus subtilis ATCC 21332 Bacillus subtilis ATCC 21332 Bacillus subtilis DSM 10T Bacillus subtilis DSM 10T
Fermentation approach Rotating discs Membrane bioreactor Anaerobic, no gas flow Foam fractionation
Cultivation time [h] 72 72 55 30
Max. cSurfactin [g/L] 0.212* 0.242* 0.087 3.995 (foam)
YP/X [g/g] 0.068 0.078* 0.278 0.192
YX/S [g/g] 0.189 0.164* 0.120 0.268
YP/S [g/g] 0.013 0.013 0.033 0.052
qSurfactin [g/(g∙h)] 0.001* 0.001* 0.005 0.006
vol. qSurfactin [g/(L∙h)] 0.003* 0.003* 0.002 0.018
  1. *the values were calculated during the current study, using data of Chtioui et al. 2012 and Coutte et al. 2010 (mSurfactin, CDW, cultivation time and cultivation volume).
  2. Comparison of different foam-free Surfactin production processes regarding their process parameters and collation with a fermentation process applying foam fractionation [2].