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Table 4 Fermentation end products (molar concentrations) obtained during the starch fermentation performed at fixed optimal pH values (third sequence)

From: Fermentative hydrogen production from glucose and starch using pure strains and artificial co-cultures of Clostridium spp.

Strain/co-culture Formate (mM) Lactate (mM) Acetate (mM) Butyrate (mM) H2 yield (mol H2/mol hexose) Biogas production rate (L biogas/ h) a
C. beijerinckii DSM 1820 −4.34 −3.18 1.25 4.0 b 0.28
C. butyricum CWBI 1009 0.09 −0.91 4.21 8.63 2.91 0.35
C. pasteurianum DSM525 4.96 −10.63 2.62 10.22 1.79 0.42
C. felsineum DSM 794 3.77 −28.62 8.98 1.04 b 0.24
Co-culture 1 1.06 −14.47 0.12 6.76 2.08 0.95
Co-culture 2 −0.42 −4.08 3.19 14.08 1.6 1.3
Co-culture 3 9.04 −6.49 8.22 17.81 2.32 1.05
  1. a Maximum biogas production rate.
  2. b This strain produced H2 mainly from the lactate and/or formate present in the medium, therefore it was not possible to correctly calculate the H2 yield per mole of hexose consumed.