Potential for using thermophilic anaerobic bacteria for bioethanol production from hemicellulose.
A limited number of bacteria, yeast and fungi can convert hemicellulose or its monomers (xylose, arabinose, mannose and galactose) into ethanol with a satisfactory yield and productivity. In the present study we tested a number of thermophilic enrichment cultures, and new isolates of thermophilic anaerobic bacterial strains growing optimally at 70-80 degrees C for their ethanol production from D-xylose. The new isolates came from different natural and man-made systems such as hot springs, paper pulp mills and brewery waste water. The test was composed of three different steps; (i) test for conversion of D-xylose into ethanol; (ii) test for viability and ethanol production in pretreated wheat straw hemicellulose hydrolysate; (iii) test for tolerance against high D-xylose concentrations. A total of 86 enrichment cultures and 58 pure cultures were tested and five candidates were selected which successfully fulfilled the criteria defined for the screening test.
Sommer
P
P
Bio-Centrum, Technical University of Denmark, Building 227, DK-2800 Lyngby, Denmark.
Georgieva
T
T
Ahring
B K
BK
D000085:Acetates / Q000737:chemistry; D001421:Bacteria, Anaerobic / Q000201:enzymology*; D001671:Biochemistry / Q000379:methods; D001709:Biotechnology; D000431:Ethanol / Q000737:chemistry* / Q000494:pharmacology; D005285:Fermentation; D006358:Hot Temperature; D011134:Polysaccharides / Q000737:chemistry*; D013696:Temperature; D014908:Triticum / Q000201:enzymology / Q000378:metabolism; D014994:Xylose / Q000737:chemistry
D000085:Acetates; D011134:Polysaccharides; D000431:Ethanol; C007916:hemicellulose; D014994:Xylose