The referred batch of S. obliquus was particularly
sugar-rich. Its average composition on a dry weight basis was
307 g/kg total sugars, 204 g/kg crude protein, 202 g/kg ash,
171 g/kg fat and 116 g/kg others (by difference) [21]. The selected
biomass load was 50 g/L, the condition with which the highest
H2 production was achieved in the optimisation assay with C.
butyricum. Fig. 3 depicts the evolution of H2 and CO2 production
and soluble sugar conversion over the time.