Hydrothermal production and gel filtration purification of xylo-oligosaccharides from rice straw

Moniz, Patrícia; Pereira, Helena; Duarte, Luís C.; Carvalheiro, Florbela

doi:10.1016/j.indcrop.2014.09.020

Cited by 73 publications

(34 citation statements)

References 33 publications

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“…The hydrolysis of xylan increased with temperature and attained large values above 200 ºC, for which more than 70% of the initial xylan was solubilised. A similar trend was obtained in other autohydrolysis studies using rice straw, corn straw, and wheat straw (Carvalheiro et al 2009;Moniz et al 2013Moniz et al , 2014.…”

Section: Selective Fractionation Of Rice Straw Hemicellulosessupporting

confidence: 88%

Fractionation of Hemicelluloses and Lignin from Rice Straw by Combining Autohydrolysis and Optimised Mild Organosolv Delignification

Moniz¹,

Lino²,

Duarte³

et al. 2015

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An integrated strategy was followed to valorise rice straw, one of the most relevant biomass feedstocks available worldwide, to selectively recover solubilised hemicelluloses and lignin. The pathway encompassed the use of autohydrolysis to hydrolyse the hemicelluloses and an ethanol-based organosolv process to solubilise lignin. Several autohydrolysis conditions were assayed with the best results obtained at 210 ºC (log R0 4.15), which enabled high removal of hemicelluloses, yielding an oligosaccharide-rich hydrolysate and a treated biomass with low content of hemicelluloses and enriched in cellulose and lignin. The effects of ethanol concentration (5 to 75%), and reaction time (0 to 24 h) on lignin removal under mild temperature (30 ºC) were studied. In optimal conditions (60.5% ethanol, 24h) the delignification yield reached 42%, whereas glucan solubilisation was below 17%. Lignin solubilisation yield was not influenced by the organosolv treatment duration while ethanol concentration favored the delignification up to 60.5% ethanol. The organosolv liquors contained economic interesting ligninderived compounds such as vanillin, ferulic, and coumaric acids. The chemical composition and enzymatic digestibility of the treated biomass from autohydrolysis and organosolv delignification were compared, with the latter presenting an almost 10% higher enzymatic digestibility than the former.

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Section: Selective Fractionation Of Rice Straw Hemicellulosessupporting

confidence: 88%

Fractionation of Hemicelluloses and Lignin from Rice Straw by Combining Autohydrolysis and Optimised Mild Organosolv Delignification

Moniz¹,

Lino²,

Duarte³

et al. 2015

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“…A direct hydrolysis would yield a solution of monomeric sugars that could be fermented to bioethanol. A hydrothermal treatment could be considered for removal of hemicelluloses and could give rise to oligosaccharides (Moniz et al 2013(Moniz et al , 2014. Delignification via solvolysis (Moniz et al 2015) would yield organosolv lignin in solution and a solid fraction of cellulose.…”

Section: Bark Valorization Potentialmentioning

confidence: 99%

Chemical characterization of the bark ofEucalyptus urophyllahybrids in view of their valorization in biorefineries

et al. 2016

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Eucalyptus urophylla hybrids are important raw materials for the forest industry in Brazil, and large quantities of barks are available at mill site that may be used for added-value products. The chemical composition of barks of six commercial hybrids clones of E. urophylla × E. grandis, E. urophylla × E. Camaldulensis, and undisclosed E. urophylla hybrids was studied. The hybrids had similar composition, on average (data based on oven dry bark): 16% extractives, mainly corresponding to polar compounds that are soluble in ethanol and water, 19% lignin, 47% polysaccharides, 1% suberin, and 2% ash. The polysaccharides consists mainly of cellulose as indicated by 84% of total neutral monosaccharides in the acid hydrolysate and 10% xylose. The compositions of the lipophilic extracts was determined by GC-MS before and after alkaline hydrolysis. In all the barks, fatty acids, and triterpenes (namely: betulinic and ursolic acids) were the most abundant compounds followed by smaller amounts of sterols, long-chain aliphatic alcohols, phenolic acids, and acylglycerols. The ethanol-water bark extract had a high phenolic content: total phenolics ranged 211-551 mg gallic acid equivalents (GAE) g -1 of extract, tannins 76-184 mg catechin equivalents (CE) g -1 extract, and flavonoids 98-234 mg CE g -1 of extract. The antioxidant activity corresponds to 338 mg Trolox g -1 of extract. Development of high-value products is proposed through an integrated biorefinery approach including valorisation of extractives and targeting for cellulose-based applications.

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“…In the case of G. glabra bark, the high content of polar extractives motivates their removal and valorisation as a first step in the conversion process, while the high content of lignin could be of interest for, e.g., biofuel production, and the xylans can be a source of xylo-oligosaccharides and other sugars (Moniz et al 2013(Moniz et al , 2014(Moniz et al , 2015.…”

Section: Chemical Compositionmentioning

confidence: 99%

Bark Characterisation of the Brazilian Hardwood Goupia glabra in Terms of Its Valorisation

Carmo¹,

Miranda²,

Quilhó³

et al. 2016

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The bark of Goupia glabra trees grown in a native forest area in the Amazon region of Brazil was anatomically and chemically characterised for potential use as a chemical source for bio-refineries. The bark is silvery-grey to reddish-grey, with a scaly rhytidome composed of 2 to 3 periderms with a small phellem content. The phloem has abundant sieve tube members and a conspicuous presence of sclerified nodules of fibersclereids or sclereids; no fibers were observed. The bark had the following average composition (dry mass): 5.2% ash, 24.6% total extractives, 1.1% suberin, and 43.8% total lignin. The polysaccharide composition showed a high ratio of xylan hemicelluloses to cellulose. The ethanol-water bark extract showed high antioxidant capacity. The chemical characterisation of different granulometric fractions showed that extractives were present preferentially in the finest fractions, particularly with enrichment in ethanol solution.

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Hydrothermal production and gel filtration purification of xylo-oligosaccharides from rice straw

Cited by 73 publications

References 33 publications

Fractionation of Hemicelluloses and Lignin from Rice Straw by Combining Autohydrolysis and Optimised Mild Organosolv Delignification

Fractionation of Hemicelluloses and Lignin from Rice Straw by Combining Autohydrolysis and Optimised Mild Organosolv Delignification

Chemical characterization of the bark ofEucalyptus urophyllahybrids in view of their valorization in biorefineries

Bark Characterisation of the Brazilian Hardwood Goupia glabra in Terms of Its Valorisation

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