Xylans

Gregory, Abigail C. E.; O’Connell, Ann P.; Bolwell, G. Paul

doi:10.1080/02648725.1998.10647965

Cited by 23 publications

(8 citation statements)

References 26 publications

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“…The hemicelluloses are associated both with the cellulose microfibrils and the lignin matrix. Their results have also been supported by observations of many other researchers (Gregory et al 1998;Tokoh et al1998;Whitney et al 1995;Vincent 1999). Atalla and co-workers proposed a few years ago that the hemicelluloses also play an important role as regulators of cellulose aggregation, resulting in formation of secondary and tertiary structures of the cell wall (Atalla et al 1993;Atalla 1995;Hackney et al 1994).…”

Section: Introductionsupporting

confidence: 77%

Controlled Assembly of Glucuronoxylans onto Cellulose Fibres

Henriksson¹,

Gatenholm²

2001

Holzforschung

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In this study we have shown that cellulose fibres can be coated with regular micron-sized particles by controlling the assembly process of xylans on the cellulose surfaces. When cotton linters were exposed to a 5 % water solution of xylan from birchwood at 110°C, 2 h, pH 8, the substrates showed an increase in weight of approximately 6.5 %, and visualization by AFM revealed regular particles on the fibre surfaces. The surface modification process was optimized using an experimental design where time, temperature, and pH were varied. The experiments showed that the amount of xylan deposited on the fibres could be varied from 2 % up to 20 % depending on treatment conditions. The temperature and time were the most important parameters, while pH was not important in the investigated region. The morphology of the deposited xylan layer, as shown by SEM, was dependent on the amount of xylan on the fibre surfaces. At low yield the fibres were coated with a homogenous layer, while at higher yields (20 %) regular particles of micron size were identified by AFM analysis. The mechanism of this assembly process of xylan on cellulose fibre surfaces is discussed. Keywords GlucuronoxylansCellulose fibres Surface modification of cellulose fibres Assembly of glucuronoxylans Brought to you by | University of Arizona Authenticated Download Date | 5/25/15 7:18 PM

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Section: Introductionsupporting

confidence: 77%

Controlled Assembly of Glucuronoxylans onto Cellulose Fibres

Henriksson¹,

Gatenholm²

2001

Holzforschung

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“…Promising results were obtained in the field of papermaking, baking, and food additives. These studies are well documented in several review papers [3][4][5][6][7][8][9] . Moreover, the variability in sugar constituents, glycosidic linkages and structure of glycosyl side chains as well as two reactive hydroxyl groups at the xylose repeating unit of the main chain offer various possibilities for regioselective chemical and enzymatic modifications.…”

Section: Introductionmentioning

confidence: 99%

Xylan and xylan derivatives - biopolymers with valuable properties, 1. Naturally occurring xylans structures, isolation procedures and properties

Ebringerová¹,

Heinze

2000

Macromol. Rapid Commun.

789

373

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“…Knowledge of the distribution of xylan and lignin (Purina et al, 1991), their reactions during pulping (lmai et al", J997;Buchert et al, 1995) and the molecular weight distribution of xylan/lignin complexes in pulps (Yokota et al, 1995) may help to a better understanding ofthe xylanase pre-bleaching process. Recently, the importance ofxylans in xylanase-based bleaching technologies has been reviewed (Gregory et al, 1998). The brightness reversion of kraft pulps is closely related to the presence of residual lignin and oxidatively modified polysaccharides (Buchert et (II., 1997).…”

Section: Functional Propertiesmentioning

confidence: 99%