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Table 1 The fermentation products according to various electron acceptors by Megasphaera sp. MH using fructose

From: Production of medium-chain carboxylic acids by Megasphaera sp. MH with supplemental electron acceptors

Electron acceptor
(EA, 100 mM)
Fermentation products (g/L)a
Butyrate (C4) Pentanoate (C5) Hexanoate (C6) Heptanoate (C7) Octanoate (C8) O.D.max
Without supplementary EA 0.3 ± 0.0 0.0 ± 0.0 0.9 ± 0.1 0.1 ± 0.0 0.6 ± 0.0 2.9 ± 0.2
Acetate (C2) 0.9 ± 0.1 0.2 ± 0.2 4.4 ± 0.0 0.1 ± 0.0 0.6 ± 0.0 5.5 ± 0.6
Propionate (C3) 0.2 ± 0.0 4.1 ± 0.3 0.2 ± 0.0 2.0 ± 0.1 0.1 ± 0.0 5.4 ± 0.3
Butyrate (C4) 1.6 ± 0.1b 0.2 ± 0.0 6.3 ± 0.0 ND 0.6 ± 0.0 3.9 ± 0.0
Acetate based (dual electron acceptors)c
Acetate(C2) +propionate(C3) 1.0 ± 0.0 5.7 ± 0.1 1.5 ± 0.1 2.7 ± 0.1 0.2 ± 0.0 6.4 ± 0.4
Acetate(C2) + butyrate (C4) 2.5 ± 0.1b 0.3 ± 0.0 9.7 ± 0.2 ND 0.6 ± 0.0 6.2 ± 0.5
Acetate(C2) + pentanoate (C5) 0.2 ± 0.0 5.8 ± 0.1b ND 3.6 ± 0.1 0.2 ± 0.0 2.2 ± 0.0
Acetate(C2) + hexanoate (C6) 1.6 ± 0.0 0.2 ± 0.0 8.7 ± 0.0b ND 1.2 ± 0.0 2.0 ± 0.0
  1. The italic numbers indicate higher production than in mPYF without supplementary electron acceptors
  2. ND not detected
  3. aThe value is average of duplicates
  4. bThe value is undefined as products or non-used electron acceptor
  5. cEach concentration was 100 mM except hexanoate (50 mM) and total concentration of extracellular electron acceptors was 200 mM (for acetate + hexanoate, 150 mM)