Revision of adsorption models of xyloglucan on microcrystalline cellulose

Abstract

Interactions among cellulose, hemicellulose and pectins are important for plant cell wall assembly and properties and also for industrial applications of these polysaccharides. Therefore, binding of pectin and xyloglucan on microcrystalline cellulose was investigated in this experiment by adsorption isotherms, zeta potential and scanning electron microscopy (SEM). Analysis of three isotherm models (Langmuir, Freundlich and Fowler-Guggenheim isotherms) showed that the experimental adsorption isotherm was well described via the Fowler-Guggenheim model, which includes lateral interaction between the adsorbate. The adsorption isotherm and zeta potential measurement showed that at temperature 25°C only xyloglucan adsorbed on the microcrystalline cellulose. In case of xyloglucan on cellulose, the equilibrium was reached in about 3-4 h, and the kinetics of adsorption were well described by the multiexponential equation. Analysis of the model suggests that two steps can be distinguished: diffusion and reconformation in an adsorbed layer. No adsorption of pectin was observed in this study. SEM study showed that xyloglucan may prevent cellulose from aggregation.

Environment-Friendly Approach toward the Treatment of Raw Agricultural Wastewater and River Water via Flocculation Using Chitosan and Bean Straw Flour as Bioflocculants

“…On the other hand, BSF particles were negatively charged at pH between 5 and 9, whereas that ζ close to zero was obtained at pH 4. The ζ profile of BSF was found to be in accordance with that observed by researchers exploring cellulose dispersions; evidently, cellulose is the main component of cell walls in bean plants. From ζ measurements for chitosan at pH within 6.5–8.5 and BSF at pH < 6, it may be initially supposed that flocculation is mainly triggered by nonelectrostatic interactions such as hydrogen bond, hydrophobic–hydrophilic balance, and van der Waals forces; at these pH values, both flocculants have ζ close to zero.…”

Probing adhesion between nanoscale cellulose fibres using AFM lateral force spectroscopy: The effect of hemicelluloses on hydrogen bonding

“…These results provide strong evidence to support the Park and Cosgrove model of primary PCWs (Park & Cosgrove, 2012b), where the presence of xyloglucan confined within cellulose-cellulose junctions is a key load-bearing element of the cellulose fibre assembly (schematically shown in Figure 8A). The mechanism by which XG promotes hydrogen bonding may well be association with the ability of XG to specifically adsorb on the surface of cellulose fibrils; this effect is well-attested in the literature (Dammak et al, 2015;Gu & Catchmark, 2014;Hanus & Mazeau, 2006;Lima, Loh & Buckeridge, 2004;Mysliwiec, Chylinska, Szymanska-Chargot, Chibowski & Zdunek, 2016;Park & Cosgrove, 2015;Villares, Moreau, Dammak, Capron & Cathala, 2015;Whitney, Brigham, Darke, Reid & Gidley, 1995;Zhang, Brumer, Agren & Tu, 2011;Zhao, Crespi, Kubicki, Cosgrove & Zhong, 2014;Zykwinska, Thibault & Ralet, 2008). Importantly, the adsorption process is governed by hydrogen bonding between xyloglucan and cellulose, i.e.…”

Utilization of industrial citrus pectin side streams for enzymatic production of human milk oligosaccharides

“…In the cell wall of citrus fruits, there is a close interaction between cellulose and fucosylated xyloglucan and it is necessary to completely release the xyloglucan structures from this network prior to enzymatic transfucosylation [35,36]. But xyloglucan is so firmly bound in the cell walls that it is difficult to release e.g.…”