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Tailormade Polysaccharides with Defined Branching Patterns: Enzymatic Polymerization of Arabinoxylan Oligosaccharides
Max Planck Inst Colloids & Interfaces, Dept Biomol Syst, Muhlenberg 1, D-14476 Potsdam, Germany.;Free Univ Berlin, Inst Chem & Biochem, Arnimallee 22, D-14195 Berlin, Germany..
Max Planck Inst Colloids & Interfaces, Dept Biomol Syst, Muhlenberg 1, D-14476 Potsdam, Germany..
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi. KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Centra, Wallenberg Wood Science Center.
Max Planck Inst Colloids & Interfaces, Dept Biomol Syst, Muhlenberg 1, D-14476 Potsdam, Germany.;Univ Potsdam, Dept Chem, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany..
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2018 (Engelska)Ingår i: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773, Vol. 57, nr 37, s. 11987-11992Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The heterogeneous nature of non-cellulosic polysaccharides, such as arabinoxylan, makes it difficult to correlate molecular structure with macroscopic properties. To study the impact of specific structural features of the polysaccharides on crystallinity or affinity to other cell wall components, collections of polysaccharides with defined repeating units are required. Herein, a chemoenzymatic approach to artificial arabinoxylan polysaccharides with systematically altered branching patterns is described. The polysaccharides were obtained by glycosynthase-catalyzed polymerization of glycosyl fluorides derived from arabinoxylan oligosaccharides. X-ray diffraction and adsorption experiments on cellulosic surfaces revealed that the physicochemical properties of the synthetic polysaccharides strongly depend on the specific nature of their substitution patterns. The artificial polysaccharides allow structure-property relationship studies that are not accessible by other means.

Ort, förlag, år, upplaga, sidor
Wiley-VCH Verlagsgesellschaft, 2018. Vol. 57, nr 37, s. 11987-11992
Nyckelord [en]
carbohydrates, enzymes, glycosynthases, structure elucidation, synthetic methods
Nationell ämneskategori
Kemi
Identifikatorer
URN: urn:nbn:se:kth:diva-235104DOI: 10.1002/anie.201806871ISI: 000443675700024PubMedID: 30044516Scopus ID: 2-s2.0-85052657815OAI: oai:DiVA.org:kth-235104DiVA, id: diva2:1248757
Forskningsfinansiär
Knut och Alice Wallenbergs Stiftelse
Anmärkning

QC 20180917

Tillgänglig från: 2018-09-17 Skapad: 2018-09-17 Senast uppdaterad: 2019-05-09Bibliografiskt granskad
Ingår i avhandling
1. On the Solubility of Wood Hemicelluloses in Water and its Influence on the Adsorption at Cellulose/Water Interfaces
Öppna denna publikation i ny flik eller fönster >>On the Solubility of Wood Hemicelluloses in Water and its Influence on the Adsorption at Cellulose/Water Interfaces
2019 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Hemicelluloses are a group of natural polysaccharides and one of the main components of wood. The availability and biodegradability of these polymers have created a great interest in developing new bio-based materials or composites from these materials for different end-use purposes. To develop new materials from these polysaccharides with better functionalities, it is essential to understand the fundamental properties of these compounds. The solubility of hemicelluloses is one of these crucial characteristics since the material has to be dissolved in an appropriate solvent if these biopolymers are to be used in, for example, dense and strong films once the solvents are removed. The interaction of these polysaccharides with different solid surfaces is also significantly influenced by their solubility at the surface/water interface and an understanding of this interaction is essential for describing composite formation, since the polysaccharides are most frequently used together with reinforcing materials such as anisotropic cellulose fibers and fibrils.

In the work described in this thesis, a novel methodology has been developed for characterizing in detail the solubility of the extracted and model mannans, arabinoxylans and xyloglucan polysaccharides. Different chemical structural analyses, chromatography, light scattering and microscopy techniques have been applied to achieve an accurate understanding of the solubility of the polysaccharides in aqueous media. A careful study has been performed to isolate and purify softwood polysaccharides, followed by the preparation of model samples to investigate the influence of processing, structural substitutions and molar mass on the solubility. Association and the phase separation of hemicelluloses have been identified in aqueous media despite their clear and transparent appearance to the naked eye.

Natural hemicelluloses are used in combination with cellulose as composite materials both to introduce different functionalities and to utilize the great mechanical properties of cellulose fibrils/fibers. Accordingly, there was a great need to study the influence of the solubility on the interaction and adsorption of these polysaccharides at the cellulose/water interface. The adsorption at the cellulose/water interface was indeed affected by the physicochemical structures and solubility of the polysaccharides, and it has been shown that an increasing molar mass and an increasing polymer concentration lead to formation of associated structures and a phase separation at cellulose model surfaces.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2019. s. 60
Serie
TRITA-CBH-FOU ; 2019:29
Nyckelord
Wood, Hemicellulose, Solubility, Adsorption, Interaction, Cellulose, Size distribution
Nationell ämneskategori
Polymerteknologi
Identifikatorer
urn:nbn:se:kth:diva-251110 (URN)978-91-7873-190-9 (ISBN)
Disputation
2019-06-07, F3, Lindstedtsvägen 26, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 2019-05-09

Tillgänglig från: 2019-05-09 Skapad: 2019-05-09 Senast uppdaterad: 2019-05-13Bibliografiskt granskad

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Wågberg, Lars

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Kishani, SainaWågberg, Lars
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Fiber- och polymerteknologiWallenberg Wood Science Center
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Angewandte Chemie International Edition
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Totalt: 248 träffar
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