Fractionation and utilisation of corn fibre carbohydrates

Gáspár, M.; Juhász, Tamás; Szengyel, Zsolt; Réczey, Kati

doi:10.1016/j.procbio.2004.04.004

Cited by 56 publications

(22 citation statements)

References 25 publications

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“…(Figure 2). This result is comparable with that obtained by Gáspár et al [43], who reported 95% lignin reduction in corn fiber treated with 2.5% NaOH at 121°C/60 min. No significant change in ash content was observed between untreated and alkali pretreated feedstocks.…”

Section: Effect Of Alkali Pretreatmentsupporting

confidence: 90%

Potential of Agricultural Residues and Hay for Bioethanol Production

Chen

Sharma-Shivappa

Keshwani

et al. 2007

Appl Biochem Biotechnol

157

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Production of bioethanol from agricultural residues and hays (wheat, barley, and triticale straws, and barley, triticale, pearl millet, and sweet sorghum hays) through a series of chemical pretreatment, enzymatic hydrolysis, and fermentation processes was investigated in this study. Composition analysis suggested that the agricultural straws and hays studied contained approximately 28.62-38.58% glucan, 11.19-20.78% xylan, and 22.01-27.57% lignin, making them good candidates for bioethanol production. Chemical pretreatment with sulfuric acid or sodium hydroxide at concentrations of 0.5, 1.0, and 2.0% indicated that concentration and treatment agent play a significant role during pretreatment. After 2.0% sulfuric acid pretreatment at 121°C/15 psi for 60 min, 78.10-81.27% of the xylan in untreated feedstocks was solubilized, while 75.09-84.52% of the lignin was reduced after 2.0% sodium hydroxide pretreatment under similar conditions. Enzymatic hydrolysis of chemically pretreated (2.0% NaOH or H 2 SO 4 ) solids with Celluclast 1.5 LNovozym 188 (cellobiase) enzyme combination resulted in equal or higher glucan and xylan conversion than with Spezyme® CP-xylanase combination. The glucan and xylan conversions during hydrolysis with Celluclast 1.5 L-cellobiase at 40 FPU/g glucan were 78.09 to 100.36% and 74.03 to 84.89%, respectively. Increasing the enzyme loading from 40 to 60 FPU/g glucan did not significantly increase sugar yield. The ethanol yield after fermentation of the hydrolyzate from different feedstocks with Saccharomyces cerevisiae ranged from 0.27 to 0.34 g/g glucose or 52.00-65.82% of the theoretical maximum ethanol yield.

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Section: Effect Of Alkali Pretreatmentsupporting

confidence: 90%

Potential of Agricultural Residues and Hay for Bioethanol Production

Chen

Sharma-Shivappa

Keshwani

et al. 2007

Appl Biochem Biotechnol

157

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“…Thus, at the highest ethanol concentration used the loss of hemicellulose in the liquid phase was reduced by 63%. It has been demonstrated that [13][14][15][16]. The decrease in the amounts of hemicellulose lost in the liquid phase demonstrated here probably was caused by the same mechanism, i.e.…”

Section: Retention Of Hemicellulose By Ethanol Additionmentioning

confidence: 64%

Pretreatment and Fractionation of Corn Stover by Soaking In Ethanol and Aqueous Ammonia

Kim

Nghiem²,

Hicks³

2009

Appl Biochem Biotechnol

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A new process for pretreatment of lignocellulosic biomass, designated the soaking in ethanol and aqueous ammonia (SEAA) process, was developed to improve hemicellulose preservation in solid form. In the SEAA process, an aqueous ammonia solution containing ethanol is used. Corn stover was treated with 15 wt.% ammonia at 1:9 solid-liquid ratio (by weight) at 60 degrees C for 24 h with ethanol added at 1, 5, 20, and 49 wt.% (balance was water). The extents by which xylan was solubilized with no ethanol and with ethanol added at 1, 5, 20, and 49 wt.% of the total liquid were 17.2%, 16.7%, 14.5%, 10.4%, and 6.3% of the original xylan, respectively. Thus, at the highest ethanol concentration used the loss of hemicellulose to the liquid phase was reduced by 63%. The digestibility of glucan and xylan in the pretreated corn stover samples by cellulase was not affected by ethanol addition of up to 20 wt.%. The enzymatic digestibility of the corn stover treated with 49 wt.% ethanol added was lower than the digestibility of the sample treated with no ethanol addition. Thus, based on these results, 20 wt.% was found to be the optimum ethanol concentration for use in the SEAA process for pretreatment of corn stover.

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“…Similarly Gáspár, Juhász, Szengyel, and Réczey (2005) studying the effect of alkaline extraction in corn fiber obtained a total yield of 20.9% for hemicellulose. The increasing concentrations of alkali extracted first the most soluble polysaccharide fraction (6.2-8.1%), the second extracted the low molecular weight polymers (7.9-9.5%), and the third the higher molecular weight hemicelluloses (5.4-6.9%) (Selvendran & O'Neill, 1987).…”

Section: Resultsmentioning

confidence: 99%

Carbohydrate composition of peach palm ( Bactris gasipaes Kunth) by-products flours

Barros

Danesi

Beléia

2015

Carbohydrate Polymers

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The flours obtained from peach palm by-products are rich in dietary fiber (62-71%) and they can be used as food ingredients. The aim of this work was to investigate the carbohydrate composition of the flours processed from the residual parts (stem and median sheath) of a hearts-of-palm industry. The flours were fractionated, based on their solubility, whose monomeric compounds were determined. The fraction containing mostly cellulose (S5) was the most abundant (26-28%), followed by the sum of fractions (S2, 53, S4) extracted with alkaline solutions (21-22%). The S1 fraction contained the highest percentage of uronic acids, which characterizes the presence of pectin. Xylose and arabinose were found in high proportion in S2 and S3 fractions. The S4 and S5 fractions, rich in glucose, were the main portion of the cell wall material and correspond to the insoluble fraction of the dietary fiber.

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Fractionation and utilisation of corn fibre carbohydrates

Cited by 56 publications

References 25 publications

Potential of Agricultural Residues and Hay for Bioethanol Production

Potential of Agricultural Residues and Hay for Bioethanol Production

Pretreatment and Fractionation of Corn Stover by Soaking In Ethanol and Aqueous Ammonia

Carbohydrate composition of peach palm ( Bactris gasipaes Kunth) by-products flours

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