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The combined enzymatic hydrolysis and fermentation of hemicellulose to 2,3-butanediol

โœ Scribed by Ernest K. C. Yu; Lise Deschatelets; John N. Saddler

Publisher
Springer
Year
1984
Tongue
English
Weight
660 KB
Volume
19
Category
Article
ISSN
1432-0614

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โœฆ Synopsis

Hemicellulose-rich fractions from several agricultural residues were converted to 2,3-butanediol by a combined enzymatic hydrolysis and fermentation process. Culture filtrates from Trichoderma harzianum E58 were used to hydrolyze the substrates while Klebsiella pneumoniae fermented the liberated sugars to 2,3-butanediol. Approximately 50-60% of a 5% (w/v) xylan preparation could be hydrolyzed and quantitatively converted to 2,3-butanediol using this procedure. Although enzymatic hydrolysis was optimal at pH 5.0 and 50 ยฐ C, the combined hydrolysis and fermentation was most efficient at pH 6.5 and 30 ยฐ C. Combined hydrolysis and fermentation resulted in butanediol levels that were 20-40% higher than could be obtained with a separate hydrolysis and fermentation process. The hemicellulose-rich water-soluble fractions obtained from a variety of steam-exploded agricultural residues could be readily used by the combined hydrolysis and fermentation approach resulting in butanediol yields of 0.4-0.5 g/g of reducing sugar utilized.

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