Improving simultaneous saccharification and co-fermentation of pretreated wheat straw using both enzyme and substrate feeding

Table 3 Summary of duplicate fed-batch simultaneous saccharification and co-fermentation of wheat straw (8%-11% WIS)

Fed-batch SSCF	Enzyme feed profile	Xylose consumption^a (%)	Xylitol formation^b (%)	Final ethanol concentration (g L^-1)	Ethanol yield (g/g)	Ethanol yield^c (%)
I	A	38	12	33.7	0.31	61
II	B	50	8	37.4	0.35	68
III	C	46	6	34.9	0.33	65
IV	D^d	49	9	38.0	0.35	69
REF	No feed	40	7	33.0	0.31	61

In all experiments, a total enzyme load of 36 FPU (g glucan)^-1 and a yeast load of 4 g L^-1 were used.
^a Related to total amount of available xylose.
^b Related to consumed xylose.
^c Corresponding to the maximum theoretical yield on total available sugars.
^d An extra yeast addition (2 g L^-1) was made at t = 24 h (see last paragraph in the results section).

ISSN: 2731-3654