Abstract
The co-culture of cellulolytic Clostridium thermocellum NBRC 103400 and butanol-producing Clostridium saccharoperbutylacetonicum strain N1-4 produced 5.5g/L of butanol from 40g/L of delignified rice straw pretreated with 1% (wt/vol) NaOH. The addition of cellulase (100U/gbiomass) in a co-culture system significantly increased butanol production to 6.9g/L using 40g/L of delignified rice straw. Compared to the control, this increase in butanol production was attributed to the enhancement of exoglucanase activity on lignocellulose degradation in experimental samples. The results showed that the co-culture system in conjunction with enhanced exoglucanase activity resulted in cost-effective butanol production from delignified rice straw.
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