Interactions between locust bean gum and cellulose characterized by13C n.m.r. spectroscopy

Newman, Roger H.; Hemmingson, Jacqueline A.

doi:10.1016/s0144-8617(98)00021-6

Cited by 34 publications

(24 citation statements)

References 13 publications

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“…From the determination of crystallinity indices, the lateral fibril dimensions (LFD) can be evaluated considering a square cross-sectional cellulose microfibril model for NMR analysis404142 (Table 2). Based on NMR signal areas from amorphous cellulose over total cellulose surfaces, and a microfibril model comprising cellulose chains having a width of 0.57 nm4344, the LFD slightly decreased with values around 4.9 nm and 4.6 nm for reference and LPMO-treated samples, respectively, in accordance to previous published values414546.…”

Section: Resultsmentioning

confidence: 99%

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Lytic polysaccharide monooxygenases disrupt the cellulose fibers structure

Villares

Moreau

Bennati-Granier

et al. 2017

Sci Rep

197

163

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Lytic polysaccharide monooxygenases (LPMOs) are a class of powerful oxidative enzymes that breakdown recalcitrant polysaccharides such as cellulose. Here we investigate the action of LPMOs on cellulose fibers. After enzymatic treatment and dispersion, LPMO-treated fibers show intense fibrillation. Cellulose structure modifications visualized at different scales indicate that LPMO creates nicking points that trigger the disintegration of the cellulose fibrillar structure with rupture of chains and release of elementary nanofibrils. Investigation of LPMO action using solid-state NMR provides direct evidence of modification of accessible and inaccessible surfaces surrounding the crystalline core of the fibrils. The chains breakage likely induces modifications of the cellulose network and weakens fibers cohesion promoting their disruption. Besides the formation of new initiation sites for conventional cellulases, this work provides the first evidence of the direct oxidative action of LPMOs with the mechanical weakening of the cellulose ultrastructure. LPMOs can be viewed as promising biocatalysts for enzymatic modification or degradation of cellulose fibers.

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Section: Resultsmentioning

confidence: 99%

“…and used several times40414245. For the C-4 region, this approach used four lines for the crystalline part and three lines for the amorphous part.…”

Section: Methodsmentioning

confidence: 99%

Lytic polysaccharide monooxygenases disrupt the cellulose fibers structure

Villares

Moreau

Bennati-Granier

et al. 2017

Sci Rep

197

163

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“…Heated cellulose-only and cellulose-xyloglucan composite preparations were prepared as above by refluxing (100°C; 72 h) 25 in sodium acetate buffer (25 mM, pH 5.8). 26 Aliquots were removed from the four preparations and freeze-dried for WAXS experiments.…”

Section: Preparations Of Cellulose and Cellulose-xyloglucan Compositesmentioning

confidence: 99%

WAXS and 13C NMR study of Gluconoacetobacter xylinus cellulose in composites with tamarind xyloglucan

Bootten

Harris

Melton

et al. 2008

Carbohydrate Research

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“…For instance, NMR was employed to characterize molecular mobility for the combination of several polysaccharides, including xanthan gum (Lüsse and Arnold 1998; Vittadini and others 2002), as well as structural interactions (Whitney and others 1998; Lazaridou and others 2000; Tojo and Prado 2003; Kim and others 2006). With the assistance of NMR, the effect of water on pectin molecules was elucidated (Kerr and Wicker 2000), whereas the molecular interactions between locust bean gum and cellulose was specified to involve mannosyl residues and not galactosyl residues as first thought (Newman and Hemmingson 1998). Capable of measuring the proton density of water throughout a sample, MRI, when used in conjunction with NMR, could relate the homogeneity of a hydrogel to its textural behavior (Gil and others 1996).…”

Section: Introductionmentioning

confidence: 99%

Characterization of Water Distribution in Xanthan‐Curdlan Hydrogel Complex Using Magnetic Resonance Imaging, Nuclear Magnetic Resonance Relaxometry, Rheology, and Scanning Electron Microscopy

Williams¹,

McCarthy²,

McCarthy³

et al. 2011

Journal of Food Science

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The combination of texture measurements and discrete noninvasive techniques was found capable of providing insightful understanding of water distribution in a gel system. These techniques may be applied to other hydrogel complexes. The XCHC system investigated has the potential to enhance freeze-thaw stability in frozen food products by minimizing syneresis due to undesirable temperature fluctuations during distribution and consumer application.

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Interactions between locust bean gum and cellulose characterized by13C n.m.r. spectroscopy

Cited by 34 publications

References 13 publications

Lytic polysaccharide monooxygenases disrupt the cellulose fibers structure

Lytic polysaccharide monooxygenases disrupt the cellulose fibers structure

WAXS and 13C NMR study of Gluconoacetobacter xylinus cellulose in composites with tamarind xyloglucan

Characterization of Water Distribution in Xanthan‐Curdlan Hydrogel Complex Using Magnetic Resonance Imaging, Nuclear Magnetic Resonance Relaxometry, Rheology, and Scanning Electron Microscopy

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