Kyushu University

Sumitomo Corporation

Kenji Sonomoto

Takeshi Zendo

Mugihito Oshiro

Katsuhiro Hanada

The present invention thus provides a method for producing L-lactic acid, which comprises the step of culturing a lactic acid bacterium that can produce L-lactic acid in a medium containing any one selected from the group consisting of cellobiose, cellooligosaccharides, xylose, arabinose, and glucose derived from cellulose and/or hemicellulose as a substrate to obtain L-lactic acid. In a preferred embodiment of the present invention,NITE BP-965 can be used.

Method for producing L-lactic acid by lactic acid bacterium under presence of pentose and cellooligosaccharides

The present invention provides a method of producing butanol, comprising: causing a microorganism which belongs to the genusand is capable of producing butanol to produce butanol in a medium comprising saccharides assimilable by a microorganism which belongs to the genus, lactic acid and/or acetic acid as substrates. By the method of the present invention, the concentration of butanol produced in a culture medium (solution) can be increased and, furthermore, the rate of butanol production can also be increased. In the present invention, a mixture of D-lactic acid and L-lactic acid obtained by lactic acid fermentation or a fermentation product of hetero-lactic acid fermentation containing acetic acid as a by-product can be utilized. By combining lactic acid fermentation and the method of the present invention, a practical system of butanol production from inedible biomass which requires neither expensive enzyme nor advanced technology such as genetic manipulation can be constructed.

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Fukuoka, Japan

Kenji Sonomoto