2009
DOI: 10.1007/s00253-009-1867-1
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Identification and characterization of fermentation inhibitors formed during hydrothermal treatment and following SSF of wheat straw

Abstract: A pilot plant for hydrothermal treatment of wheat straw was compared in reactor systems of two steps (first, 80 degrees C; second, 190-205 degrees C) and of three steps (first, 80 degrees C; second, 170-180 degrees C; third, 195 degrees C). Fermentation (SSF) with Sacharomyces cerevisiae of the pretreated fibers and hydrolysate from the two-step system gave higher ethanol yield (64-75%) than that obtained from the three-step system (61-65%), due to higher enzymatic cellulose convertibility. At the optimal cond… Show more

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Cited by 102 publications
(70 citation statements)
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“…The ranges of inhibitor concentrations were chosen according to those observed in lignocellulose hydrolysates. 6 Growth (biomass production) and glucose consumption were monitored. Since glucose consumption showed the same profile as biomass production concerning inhibition, results were analyzed only on the basis of biomass production.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…The ranges of inhibitor concentrations were chosen according to those observed in lignocellulose hydrolysates. 6 Growth (biomass production) and glucose consumption were monitored. Since glucose consumption showed the same profile as biomass production concerning inhibition, results were analyzed only on the basis of biomass production.…”
Section: Resultsmentioning
confidence: 99%
“…2 Although hydrothermal treatments have most of these advantages, the risk of the production of compounds like carboxylic acids, furfural, HMF, and soluble phenolic compounds should be considered. 6,7 These compounds inhibit growth and ethanol fermentation by bacteria, fungi and yeasts. 3 -5 Furan compounds, such as 5-hydroxymethyl-2-furaldehyde (HMF) and 2-furaldehyde, are formed by dehydration of hexoses and pentoses, respectively.…”
Section: Introductionmentioning
confidence: 99%
“…These products have been found at concentrations in the range 0.007-11 g L −1 after the pretreatment of lignocelluloses, depending on the pretreatment procedure and the type of raw material. 17,18 The pretreatment process should avoid the formation of inhibitors for subsequent hydrolysis and fermentation processes. Figure 5 illustrates a comparison of FeCl 3 and H 2 SO 4 catalysts with respect to the formation of HMF and furfural.…”
Section: Identification Of Inhibitors Formed During Ethanosolv Treatmmentioning
confidence: 99%
“…For instance, the thermophilic bacterium Ureibacillus thermophaercus was employed to remove furfural and 5-HMF and phenolic compounds from a waste house wood hydrolysate [43], increasing markedly the ethanol production rate by S. cerevisiae in a subsequent fermentation stage. The yeast S. cerevisiae has also the natural ability to assimilate some of these inhibitory compounds -mainly furfural, 5-HMF and aromatic aldehydes such as vanillin, syringaldehyde or 4-hydroxybenzaldehydeand convert them into less inhibitory forms [44,45]. Furthermore, this innate capacity can be improved by subjecting S. cerevisiae to evolutionary engineering in the presence of inhibitory compounds, boosting its fermentation performance in lignocellulosic pretreated materials [46].…”
Section: Detoxification Of Pretreated Materialsmentioning
confidence: 99%