Fig. 5.

Acetone, n-butanol, and butyric acid (ABB) production by C. beijerinckii fermentation of soluble (a) or solids (b) fraction from the two-step process. a ABB production per gram input sugars for the neutralized 1 % acid extracted sugars (first fermentation in Fig. 3b). b ABB production per gram input sugars for the neutralized enzymatically hydrolyzed solids (second fermentation in Fig. 3d). Data for both are mg ABB/g sugar for duplicate 35 °C 120-hour fermentation with standard deviation