From plant biomass to bio-based chemicals: Latest developments in xylan research

Deutschmann, Rudolf; Dekker, Robert F. H.

doi:10.1016/j.biotechadv.2012.07.001

Cited by 234 publications

(139 citation statements)

References 255 publications

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“…Therefore, transition toward cheaper (non-edible) feedstocks offers the biggest opportunity for cost reduction and improved sustainability (Guan et al, 2016). Among the different types of biomass available, xylan, which is the second most abundant natural repository of xylose on Earth, is an attractive substrate for butanol production by microbial processes (Deutschmann and Dekker, 2012). Current industrial bioconversion of lignocellulosic biomass to biofuels, mainly ethanol, relies on separate hydrolysis process prior to fermentation, and requires extensive pretreatments, addition of costly enzymes, and detoxification to remove hydrolysate inhibitors generated from lignin and sugar degradation.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous saccharification and fermentation of hemicellulose to butanol by a non-sporulating Clostridium species

2016

Bioresource Technology

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h i g h l i g h t sSimultaneous saccharification and fermentation of xylan to butanol by new strain MF28. Simultaneous fermentation of glucose and xylose to produce 11.9 g/L butanol. High yields of butanol on xylan and xylooligosaccharide were obtained. No acetone/ethanol byproducts were formed in converting lignocellulose to butanol. Non-sporulating strain MF28 is capable of continuous industrial-scale fermentation. a r t i c l e i n f o t r a c tProduction of lignocellulosic butanol has drawn increasing attention. However, currently few microorganisms can produce biofuels, particularly butanol, from lignocellulosic biomass via simultaneous saccharification and fermentation. Here we report discovery of a wild-type, mesophilic Clostridium sp. strain MF28 that ferments xylan to produce butanol (up to 3.2 g/L) without the addition of saccharolytic enzymes and without any chemical pretreatments. Application of selective pressure from 2-deoxy-Dglucose facilitated isolation of strain MF28, which exhibits inactivation of genes (gid and ccp genes) responsible for carbon catabolite repression, thus allowing strain MF28 to simultaneously ferment a combination of glucose (30 g/L), xylose (15 g/L), and arabinose (15 g/L) to produce 11.9 g/L of butanol. Strain MF28 possesses several unique features: (i) non-sporulating, (ii) no acetone/ethanol, (iii) complete hemicellulose-binding enzymatic domain, and (iv) absence of carbon catabolite repression. These unique characteristics demonstrate the industrial potential of strain MF28 for cost-effective biofuel generation from lignocellulosic biomass.

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Section: Introductionmentioning

confidence: 99%

Simultaneous saccharification and fermentation of hemicellulose to butanol by a non-sporulating Clostridium species

2016

Bioresource Technology

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“…Recently, in response to the depletion of fossil fuel resources, fractionation of lignocelluloses into constituent biopolymers -cellulose, hemicelluloses, and lignin, etc., and their applications represent great potential for providing natural chemicals and materials as alternative sources to fossil fuel-based products (Agbor et al 2011;Deutschmann and Dekker 2012;Doherty et al 2011). Hemicelluloses are heterogeneous polysaccharides composed of glucose, xylose, mannose, galactose, arabinose, and rhamnose together with uronic acids, which are specially combined according to the plant species and the living conditions.…”

Section: Graded Ethanol Fractionation and Structural Characterizationmentioning

confidence: 99%

Graded Ethanol Fractionation and Structural Characterization of Alkali-Extractable Hemicelluloses from Olea europaea L.

Peng¹,

Bian²,

Li³

et al. 2013

BioResources

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Dewaxed Olea europaea L. was subjected to delignification followed by alkali extraction with 10% KOH containing 1% H 3 BO 3 . The released hemicelluloses were fractionated by precipitation through acidification and ethanol solutions with increasing concentrations from 20 to 30, 40, 50, 60, 70, and 90%. The structure of the subfractions obtained was comparatively characterized by sugar analysis, molecular weight, FT-IR, and NMR spectroscopy. Results indicated that 23.5% of hemicelluloses (% of the dewaxed material) were isolated by the alkaline extraction. An increase of ethanol concentration resulted in the precipitation of the more branched hemicelluloses as indicated by the increase of the ratios of arabinose to xylose and uronic acids to xylose. The hemicellulose subfractions Ha (precipitated by acidification to pH 5.5) and H30 (precipitated by 30% ethanol solution) had a similar structure, which was assumed to be glucuroxylan together with a small amount of α-glucan, whereas the hemicellulose subfraction H70 (precipitated by 70% ethanol solution) had a more complicated structure, which was mainly composed of a (1→4)-linked β-D-xylopyranosyl backbone with various side chains. The comprehensive structural characterization of the hemicelluloses of this species provides fundamental information for their potential applications in the fields of materials, chemicals, and energy production.

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“…spruce, pine and cedar) [5]. This polysaccharide is formed by β-(1 → 4)-linked D-xylopyranose (D-Xylp) monomer units, being, however, the chemical structure dependent on the xylan source [6]. The main xylan in hardwood species is O-acetyl-4-O-methylglucuronoxylan while in softwood species is arabino-4-O-methylglucuronoxylan.…”

Section: Introductionmentioning

confidence: 99%

“…They have been applied in the production of bioethanol, xylitol and xylo-oligosaccharides [3,6,10,11], as well as in films with low oxygen permeability [12][13][14], composites [15,16], hydrogels [17], surfactants [18], as pa ⁎ ⁎ Corresponding author.…”

Section: Introductionmentioning

confidence: 99%

Surface properties of xylan and xylan derivatives measured by inverse gas chromatography

Sousa

Pedrosa

Ramos

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Xylan (the most common hemicellulose in wood and annual plants) and xylan derivatives have a very wide field of uses for which physico-chemical surface properties play an important role (e.g. in composites or barrier materials). In the present work, for the first time, inverse gas chromatography (at infinite dilution conditions) was used to assess the surface properties of xylan and xylan derivatives. Firstly, carboxymethyl xylan (CMX) and hydroxypropyl xylan (HPX) have been synthesized from commercial xylan (BX) and the presence of substituent groups confirmed by infrared spectroscopy and 1 H NMR. Then, the modified and original xylans were analysed for their dispersive component of the surface energy (γ s d ) and Lewis acid-base properties. It was found that carboxymethylation and hydroxypropylation decreased significantly the γ s d value of xylan: from 47.6 mJ m −2 in BX to 33.0 mJ m −2 and 23.5 mJ m −2 in CMX and HPX, respectively. As for the Lewis acid-base properties, HPX showed a perfectly amphoteric behaviour while the surfaces of unmodified xylan and CMX showed a prevalence of Lewis acidic character over the Lewis basic character, being, however, the surface of CMX less acidic than that of the original xylan. These results were interpreted in terms of the effect of the presence of the new substituent groups in the xylan backbone.

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From plant biomass to bio-based chemicals: Latest developments in xylan research

Cited by 234 publications

References 255 publications

Simultaneous saccharification and fermentation of hemicellulose to butanol by a non-sporulating Clostridium species

Simultaneous saccharification and fermentation of hemicellulose to butanol by a non-sporulating Clostridium species

Graded Ethanol Fractionation and Structural Characterization of Alkali-Extractable Hemicelluloses from Olea europaea L.

Surface properties of xylan and xylan derivatives measured by inverse gas chromatography

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