Fig. 4. Fermentation of the ΔldhA-6 mutant with the hydrolysates of HPAC-pretreated pine. The metabolites (succinic acid, lactic acid, and acetic acid) produced by fermentation of the 1% (A), 2% (B), 3% (C), 4% (D), and 5% hydrolysate (E) were analyzed. The cell concentrations were 10.15 (A), 15.72 (B), 16.08 (C), 21.19 (D), and 21.08 (E) g L-1 CDW (cell dried weight) for fermentation of the hydrolysates, respectively.