Thermophilic anaerobic fermentation of hemicellulose and hemicellulose-derived aldose sugars by Thermoanaerobacter strain B6A View Full Text


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Article Info

DATE

1985-11

AUTHORS

P. J. Weimer

ABSTRACT

The thermophilic, anaerobic fermentation of hemicellulosic subtrates by Thermoanaerobacter strain B6A was investigated using a variety of commercially-available hemicelluloses which had been characterized by physical and chemical analysis. Products of hemicellulose fermentation included ethanol, acetic acid, lactic acid, H2, and CO2 in ratios which varied depending on the hemicellulose used. Both the rate and extent of substrate utilization (as estimated from product formation) varied in the order: unidentified mannan/xyloglucan > xylan > 4-O-methylglucuronoxylan > arabinoxylan > type II arabinogalactan=0. Rates of product formation were enhanced up to twofold by autoclaving of substrates,which partially depolymerized the substrates and in some cases altered their composition. Total extent of product formation, however, was similar in autoclaved and non-autoclaved substrates. Hemicellulose fermentations were mediated by one or more constitutive extracellular enzyme activities. Component monosaccharides of hemicelluloses in their natural isomeric configurations supported rapid growth (μmax = 0.3−1.0 h−1), while δunnatural” isomers were not utilized.The wide carbohydrate utilization spectrum of this strain apparently reflects its role as a versatile primary consumer in the hot spring bacterial-algal mat from which it was isolated. More... »

PAGES

130-136

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00411035

DOI

http://dx.doi.org/10.1007/bf00411035

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1009743907


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