Cellulosic ethanol production by consortia of Scheffersomyces stipitis and engineered Zymomonas mobilis

Table 1 Comparison of various consortia fermentation profiles in simulated medium

Fermentation mode^a	Initial sugar concentration (g/L)	Xylose removal efficiency (%)	Ethanol yield (g/g)	Ethanol productivity (g/L/h)	References
Two-stage fermentation
Suspended Z. mobilis + suspended S. stipitis	80 g/L glucose + 40 g/L xylose	62.5	–	1.56	[15]
Suspended S. stipitis + suspended Z. mobilis^b	60 g/L xylose + 100 g/L glucose	–	0.474	1.416	[16]
Suspended Z. mobilis + suspended S. stipitis	80 g/L glucose + 40 g/L xylose	0.67	0.36	0.41	[19]
One-stage fermentation
Suspended S. cerevisiae + suspended S. stipitis	75 g/L glucose + 30 g/L xylose	79.6	0.4	1.26	[41]
Suspended S. cerevisiae + suspended S. stipitis	20 g/L glucose + 10 g/L xylose	–	0.416	0.608	[42]
Immobilized Z. mobilis + immobilized S. stipitis^c	80 g/L glucose + 40 g/L xylose	72.5	0.37	0.87	[19]
Suspended Z. mobilis + suspended S. stipitis^d	80 g/L glucose + 40 g/L xylose	84.95	0.50	4.99	This study

^aTwo-stage fermentation means the two species were inoculated into the medium sequentially, while one-stage fermentation means the two species were inoculated into the medium simultaneously
^bXylose was first depleted by S. stipitis. Then, glucose medium and Z. mobilis were added to the same system to initiate the glucose fermentation
^cZ. mobilisand S. stipitiswere immobilized separately
^d S. stipitis CICC1960:Z. mobilis 8b = 1:3
–, not available

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