Flexible oxygen barrier films from spruce xylan

Escalante, Alfredo; Gonçalves, Ana Margarida da Cunha; Bodin, Aase Katarina; Stépán, Agnes; Sandström, Corine; Toríz, Guillermo; Gatenholm, Paul

doi:10.1016/j.carbpol.2011.11.003

Cited by 116 publications

(77 citation statements)

References 18 publications

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“…In particular, conifer xylans are of the arabinoglucuronoxylan (AGX) type, with a-(1→2) D-GlcA in its 4-O-methylated form (mGlcA) and a-(1→3) L-arabinofuranose (Ara) as the backbone main decorations and with no reported acetylations ( Fig. 1; Escalante et al, 2012;Busse-Wicher et al, 2016b;McKee et al, 2016). A regular distribution of glucuronic acids was reported previously in the xylans extracted from softwoods, whereas the pattern in hardwoods seemed to be irregular (Jacobs et al, 2001).…”

mentioning

confidence: 63%

“…This has a strong influence on the aggregation of xylan in dispersions and on the hydrodynamic properties of xylan-based materials. Indeed, higher Ara and mGlcA contents have been reported to hinder the supramolecular aggregation of xylans in aqueous systems Pitkänen et al, 2009;Bosmans et al, 2014) and to influence the reactivity and macroscopic properties of xylan-based materials Escalante et al, 2012;Littunen et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

“…AGX was extracted and purified from Norway spruce (Picea abies) secondary cell walls using two complementary processes: (1) alkali extraction after delignification (AGX-A) following the procedure reported by Escalante et al (2012) and (2) …”

Section: Purification Of Softwood Xylan and Compositional Analysismentioning

confidence: 99%

“…Recent studies, however, have shown that glycosidic and acetyl decorations are preferably evenly spaced in specific domains of the xylan backbone (Bromley et al, 2013;Busse-Wicher et al, 2014;Chong et al, 2014), which could sterically allow favorable interactions with the hydrophilic surfaces of cellulose microfibrils (BusseWicher et al, 2016a(BusseWicher et al, , 2016b. Moreover, backbone substitution influences the solubility of hemicelluloses and their macroscopic properties Sternemalm et al, 2008;Pitkänen et al, 2009;Escalante et al, 2012;Bosmans et al, 2014;Littunen et al, 2015).…”

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confidence: 99%

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Regular Motifs in Xylan Modulate Molecular Flexibility and Interactions with Cellulose Surfaces

et al. 2017

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ORCID IDs: 0000-0003-0277-2269 (J.B.); 0000-0001-6732-2571 (J.W.); 0000-0003-3572-7798 (F.V.).Xylan is tightly associated with cellulose and lignin in secondary plant cell walls, contributing to its rigidity and structural integrity in vascular plants. However, the molecular features and the nanoscale forces that control the interactions among cellulose microfibrils, hemicelluloses, and lignin are still not well understood. Here, we combine comprehensive mass spectrometric glycan sequencing and molecular dynamics simulations to elucidate the substitution pattern in softwood xylans and to investigate the effect of distinct intramolecular motifs on xylan conformation and on the interaction with cellulose surfaces in Norway spruce (Picea abies). We confirm the presence of motifs with evenly spaced glycosyl decorations on the xylan backbone, together with minor motifs with consecutive glucuronation. These domains are differently enriched in xylan fractions extracted by alkali and subcritical water, which indicates their preferential positioning in the secondary plant cell wall ultrastructure. The flexibility of the 3-fold screw conformation of xylan in solution is enhanced by the presence of arabinofuranosyl decorations. Additionally, molecular dynamic simulations suggest that the glycosyl substitutions in xylan are not only sterically tolerated by the cellulose surfaces but that they increase the affinity for cellulose and favor the stabilization of the 2-fold screw conformation. This effect is more significant for the hydrophobic surface compared with the hydrophilic ones, which demonstrates the importance of nonpolar driving forces on the structural integrity of secondary plant cell walls. These novel molecular insights contribute to an improved understanding of the supramolecular architecture of plant secondary cell walls and have fundamental implications for overcoming lignocellulose recalcitrance and for the design of advanced wood-based materials.

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confidence: 63%

Section: Discussionmentioning

confidence: 99%

Section: Purification Of Softwood Xylan and Compositional Analysismentioning

confidence: 99%

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confidence: 99%

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Regular Motifs in Xylan Modulate Molecular Flexibility and Interactions with Cellulose Surfaces

et al. 2017

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“…However, water vapor permeability and oxygen permeability also are crucial properties, especially when considering many food packaging applications (Mikkonen et al 2010). Consequently, modification of the barrier properties of hemicelluloses-derived biopolymers against water and moisture must be significantly improved before they can be considered suitable for various food packaging solutions (Saxena et al 2011;Escalante et al 2012). Such modifications may include several possibilities, such as etherification, esterification, oxidation, and polymerization pathways (Ren et al 2012).…”

Section: Polysaccharide-based Biodegradable Films and Hydrogelsmentioning

confidence: 99%

Chemical Pretreatments of Wood Chips Prior to Alkaline Pulping - A Review of Pretreatment Alternatives, Chemical Aspects of the Resulting Liquors, and Pulping Outcomes

Lehto

Alén

2015

BioResources

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The chemical industry is being forced to evaluate new strategies for more effective utilization of renewable feedstocks to diminish the use of fossil resources. In this literature review, the integration of both acidic and alkaline pretreatment phases of hardwood and softwood chips with chemical pulping is discussed. Depending on the pretreatment conditions, high-volume sulfur-free fractions with varying chemical compositions can be produced. In case of acidic pretreatments, the major products include carbohydrates (mono-, oligo-, and polysaccharides), whereas under alkaline (i.e., aqueous NaOH) pretreatment conditions, the sulfur-free fractions of aliphatic carboxylic acids, lignin, and extractives are primarily obtained. All these fractions are potentially interesting groups of compounds and can be used in a number of applications. Finally, the effects of pretreatments on pulping are also considered. Although it is believed that there are important advantages to be gained by integrating this type of renewable raw material-based production, in particular, with kraft pulping, sulfur-free pulping methods such as soda-AQ and oxygen/alkali delignification processes are also briefly discussed.

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The coordinated action of glucuronoyl esterase and α‐glucuronidase promotes the disassembly of lignin–carbohydrate complexes

et al. 2021

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Glucuronoxylans represent a significant fraction of woody biomass, and its decomposition is complicated by the presence of lignin–carbohydrate complexes (LCCs). Herein, LCCs from birchwood were used to investigate the potential coordinated action of a glucuronoyl esterase (TtCE15A) and two α‐glucuronidases (SdeAgu115A and AxyAgu115A). When supplementing α‐glucuronidase with equimolar quantities of TtCE15A, total MeGlcpA released after 72 h by SdeAgu115A and AxyAgu115A increased from 52% to 67%, and 61% to 95%, respectively. Based on the combined TtCE15A and AxyAgu115A activities, ~ 34% of MeGlcpA in the extracted birchwood glucuronoxylan was occupied as LCCs. Notably, insoluble LCC fractions reduced soluble α‐glucuronidase concentrations by up to 70%, whereas reduction in soluble TtCE15A was less than 30%, indicating different tendencies to adsorb onto the LCC substrate.

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Flexible oxygen barrier films from spruce xylan

Cited by 116 publications

References 18 publications

Regular Motifs in Xylan Modulate Molecular Flexibility and Interactions with Cellulose Surfaces

Regular Motifs in Xylan Modulate Molecular Flexibility and Interactions with Cellulose Surfaces

Chemical Pretreatments of Wood Chips Prior to Alkaline Pulping - A Review of Pretreatment Alternatives, Chemical Aspects of the Resulting Liquors, and Pulping Outcomes

The coordinated action of glucuronoyl esterase and α‐glucuronidase promotes the disassembly of lignin–carbohydrate complexes

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