TABLE 2.

Comparison of representative fermentation results obtained from C. acetobutylicum biofilm or planktonic cells.

Culture	Process mode	Butanol titer (g/L)	Solvent yield(g/g)	Solvent productivity (g/L/h)	References
C. acetobutylicum B3	Free cells	11.8	0.34	0.25	Liu et al., 2014
C. acetobutylicum ATCC 55025	Biofilm-immobilized cells, continuous fermentation	∼5	0.42	4.6	Huang et al., 2004
C. beijerinckii BA101	Biofilm-immobilized cells, continuous fermentation	∼5	0.38	15.8	Qureshi et al., 2000
C. beijerinckii BA101	Biofilm-immobilized cells, batch fermentation	20.9	0.41	0.59	Chen and Blaschek, 1999
C. beijerinckii NCIMB 8052	Biofilm-immobilized cells, continuous fermentation	13.4	0.44	0.40	Lee et al., 2008
C. acetobutylicum B3	Biofilm-immobilized cells, batch fermentation	15.6	0.38	1.88	Liu et al., 2013