highest concentrations of these analytes were observed in experiments carried out with unwashed samples. Glycerol and xylitol are known yeast metabolites and differences in their concentration can be attributed to differences in the chemical composition of the fermentation medium. However, glycerol was usually found in
concentrations higher than xylitol, which was not even detected in many fermentation experiments.
Table 5 demonstrates the positive influence of pretreatment on the ethanol production from elephant grass glucans. Water washing of the pretreated biomass was also beneficial for this same