Structural polymorphism of (1→4)—β—d—Xylan

Chanzy, H.; Dubé, M.; Marchessault, R. H.

doi:10.1016/0032-3861(79)90205-2

Cited by 24 publications

(21 citation statements)

References 11 publications

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“…In another study on birch pulp, the adsorbed xylan was identified by a resonance at 81.7 ppm, which again was not present in xylan alone (Teleman et al 2001), but the association of such resonance with a given conformation was not made. In the crystalline state, xylan allomorphs, different from the classical xylan hydrate have been reported (Chanzy et al 1979;Roelofsen 1954), but neither their unit cell, nor their structure has been established. It would be of great importance to know more about these and in particular to see whether they correspond indeed to the elusive 2 1 family, which seems to be allowed from considerations of the conformational energy of linear xylan (Yui et al 1995).…”

Section: Discussionmentioning

confidence: 98%

“…Micron-sized hexagonal single crystals have been prepared from esparto grass xylan, a low molecular weight sample devoid of any substituent (Marchessault et al 1961). When observed under frozen hydrated conditions, these crystals yield electron diffraction diagrams that are compatible with the threefold xylan system (Chanzy et al 1979). In a few instances, crystals yielding different diffraction diagrams have also been obtained, indicating that other allomorphs and likely other conformations are possible for crystalline xylan.…”

Section: Introductionmentioning

confidence: 96%

“…In a few instances, crystals yielding different diffraction diagrams have also been obtained, indicating that other allomorphs and likely other conformations are possible for crystalline xylan. So far however, no crystals structure has been proposed for such allomorphs, which have been observed after the recrystallization of either hexagonal xylan single crystals (Chanzy et al 1979) or xylan extracted from commercial rye straw sulfate pulp (Roelofsen 1954).…”

Section: Introductionmentioning

confidence: 98%

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The molecular basis of the adsorption of xylans on cellulose surface

Mazeau

Charlier

2012

Cellulose

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In order to model the adsorption of xylan on cellulose, we have simulated, at the atomic level, the gas phase adsorption of small xylan fragments having 5 skeletal b (1 ? 4) xylosyl residues (X 5 ), using molecular dynamics simulations. A first regime was considered, corresponding to a low surface coverage, with the adsorption of isolated X 5 in various initial orientations. In this regime, the simulation indicated that X 5 moved toward extended conformations, some of them being helical, with the possibility of either 2 1 or left-handed 3 1 helices. During the simulation, the X 5 fragments became preferentially oriented, parallel or anti parallel with respect to the cellulose chain axis. Substitution of the X 5 backbone by either GlcA and/or Araf side chains had no major influence on either the conformation or the efficiency of the interaction. However, the presence of side chains favored orientations of the X 5 backbone inclined with respect to the cellulose chain axis. In a second regime corresponding to monolayer coverage, the geometrical features of the adsorption of the xylan fragments on cellulose was roughly the same as that in the individual coverage situation. In this case, the monolayer became equilibrated at 0.14 g of xylan fragments for each g of cellulose, a figure that compared favourably with the values obtained in experimental adsorption of xylan on bacterial cellulose.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 98%

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The molecular basis of the adsorption of xylans on cellulose surface

Mazeau

Charlier

2012

Cellulose

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“…This suggests the formation of a loose layer that becomes denser as the concentration increases. Fig S4. In addition, to account for the conformational polymorphism of xylan (Chanzy, Dube, & Marchessault, 1979;Larsson, 2004;Teleman, Larsson, & Iversen, 2001) The four models were subjected to MD simulations at two temperatures. During the high temperature phase, the xylan chains explored the two helical conformations with rapid interconversions between the two forms.…”

Section: Comparison Of the Viscoelasticity Behaviors Of Adsorbed Layersmentioning

confidence: 99%

Meaning of xylan acetylation on xylan-cellulose interactions: A quartz crystal microbalance with dissipation (QCM-D) and molecular dynamic study

Jaafar

Mazeau

Boissière

et al. 2019

Carbohydrate Polymers

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In plant cell walls, xylan chains present various substituents including acetate groups. The influence of the acetyl substitution on the organization of xylan-cellulose complexes remains poorly understood. This work combines in vitro and in silico approaches to decipher the functional role of acetyl groups on the xylan/cellulose interaction. Acetylated xylans were extracted from apple pomace with dimethyl sulfoxide-lithium chloride (DMSO-LiCl) and deacetylated using a mild alkali treatment. The adsorption behavior of acetylated and deacetylated xylan fractions was investigated using quartz crystal microbalance with dissipation (QCM-D) and molecular dynamics. Acetylated xylans form a dense and poorly hydrated and rigid layer on cellulose with xylan chains that have two residues per helical turn conformation, whereas the deacetylated fraction forms a swollen and more viscous layer in which only the xylan chains in direct contact with the cellulose surface have two residues per helical turn conformation. The other chains have three residues per turn conformation.

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“…Side groups of xylan that would interrupt packing of the chains of crystals [ 137 ] were cleaved by successful purification cycles resulting in the xylan forming a threefold axis crystal hydrate structure [ 138 ]. Chanzy and researchers further investigated such structures and used electron diffraction to provide the current state of knowledge on xylan crystals [ 139 ]. Purification of xylan leading to crystals suggests the possibility of using biotechnology to remove specific side groups common to xylan that would aid in controlling the formation of xylan single crystals in aqueous suspensions.…”

Section: Lignocellulosic Biomass Chemical Constituentsmentioning

confidence: 99%

Tailoring renewable materials via plant biotechnology

Vries

Guevara-Rozo

Cho

et al. 2021

Biotechnol Biofuels

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Plants inherently display a rich diversity in cell wall chemistry, as they synthesize an array of polysaccharides along with lignin, a polyphenolic that can vary dramatically in subunit composition and interunit linkage complexity. These same cell wall chemical constituents play essential roles in our society, having been isolated by a variety of evolving industrial processes and employed in the production of an array of commodity products to which humans are reliant. However, these polymers are inherently synthesized and intricately packaged into complex structures that facilitate plant survival and adaptation to local biogeoclimatic regions and stresses, not for ease of deconstruction and commercial product development. Herein, we describe evolving techniques and strategies for altering the metabolic pathways related to plant cell wall biosynthesis, and highlight the resulting impact on chemistry, architecture, and polymer interactions. Furthermore, this review illustrates how these unique targeted cell wall modifications could significantly extend the number, diversity, and value of products generated in existing and emerging biorefineries. These modifications can further target the ability for processing of engineered wood into advanced high performance materials. In doing so, we attempt to illuminate the complex connection on how polymer chemistry and structure can be tailored to advance renewable material applications, using all the chemical constituents of plant-derived biopolymers, including pectins, hemicelluloses, cellulose, and lignins.

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Structural polymorphism of (1→4)—β—d—Xylan

Cited by 24 publications

References 11 publications

The molecular basis of the adsorption of xylans on cellulose surface

The molecular basis of the adsorption of xylans on cellulose surface

Meaning of xylan acetylation on xylan-cellulose interactions: A quartz crystal microbalance with dissipation (QCM-D) and molecular dynamic study

Tailoring renewable materials via plant biotechnology

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