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Table 2 Maximal production rates compared with other similar works

From: One-step production of C6–C8 carboxylates by mixed culture solely grown on CO

Culture Substrate Reactor Product extraction Maximal production rates (mmol L−1 day−1) Maximal concentrations (mmol L−1) References
C2a C4 C6 C8 C2 C4 C6 C8
Clostridium autoethanogenum + Clostridium kluyveri Acetate + CO Batch No NAb 8.5 2.5 ND NA ~15.5 ~1.6 ND [9]
Clostridium ljungdahlii + Clostridium kluyveri Acetate + syngas (60% CO, 35% H2, 5% CO2) Continuous Yes NA 32.3 11.7 ND NA 49.1 17.4 < 0.04 [10]
Clostridium kluyveri Acetate + ethanol (actual syngas fermentation effluent) Continuous Yes NA 9.4 39.9 1.4 NA 20.0 ~56.0 2.2 [8]
Mixed culture Acetate + ethanol (actual syngas fermentation effluent) Anaerobic filter (semi-continuous) No NA 196.1 14.7 ND NA 190.2 8.6 ND [7]
Mixed culture CO2 + H2 Hollow-fiber membrane biofilm reactor No 3.25 0.65 0.27 0.12 123.3 21.4 8.4 2.9 [15]
Mixed culture CO Semi-continuous No 11.0 1.2 0.3 0.10 80.6 8.1 1.9 1.0 This study
  1. aC2, C4, C6, C8 are for acetate, n-butyrate, n-caproate and n-caprylate, respectively
  2. bNegative rates are indicated NA not detected are indicated ND, “~” means the approximate value