Fig. 2 shows the evolution of ethanol production (g L1
) during
PPW hydrolyzate fermentation. The maximum ethanol produced
was 6.97 g L1 after 48 h fermentation, subsequently leveling off
to 60 h with a slight decrease thereafter. The product yield Y p/s
(g of product/g of sugar consumed) was 0.463 (or 46.3%). This corresponds
to 92.6% of the max theoretical yield obtained when the
substrate is pure glucose (Bryan, 1990).