Anthrahydroquinone-2,6,-disulfonate (AH2QDS) increases hydrogen molar yield and xylose utilization in growing cultures of Clostridium beijerinckii

摘要: H2 production and xylose utilization were investigated using the fermentative culture Clostridium beijerinckii NCIMB 8052. Adding anthrahydroquinone-2,6-disulfonate (AH2QDS) increased extent of by 56% hydrogen molar yield 24–37%. Enhanced correlated with increases in acetate/butyrate product ratio. An electron balance indicated that AH2QDS shifted electrons from butyric acid pathway (NADH-dependent pathway) to acetic (non-NADH-dependent pathway), putatively creating a surplus reducing equivalents then available for production. These data demonstrate can be manipulated amending redox active molecules into growing cultures. This will impact biohydrogen/biofuel allowing physiological manipulations cells (or decreased) output selected metabolites amendments are not consumed during reactions. Although current small, they suggest target cellular alterations. In addition, critical fermentation pretreated lignocellulosic feedstocks, which may have higher content.