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Functional and anionic cellulose-interacting polymers by selective chemo-enzymatic carboxylation of galactose-containing polysaccharides
KTH, Skolan för bioteknologi (BIO), Glykovetenskap. KTH, Skolan för kemivetenskap (CHE), Centra, Wallenberg Wood Science Center.
Vise andre og tillknytning
2012 (engelsk)Inngår i: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 13, nr 8, s. 2418-2428Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Carboxylated, anionic polysaccharides were selectively prepared using a combination of enzymatic and chemical reactions. The galactose-containing polysaccharides studied were spruce galactoglucomannan, guar galactomannan, and tamarind galactoxyloglucan. The galactosyl units of the polysaccharides were first oxidized with galactose oxidase (EC 1.1.3.9) and then selectively carboxylated, resulting in the galacturonic acid derivatives with good conversion and yield. The degrees of oxidation (DO) of the products were determined by gas chromatography-mass spectrometry (GC-MS). A novel feasible electrospray ionization-mass spectrometry (ESI-MS) method was also developed for the determination of DO. The solution properties and charge densities of the products were investigated. The interaction of the products with cellulose was studied by two methods, bulk sorption onto bleached birch kraft pulp and adsorption onto nanocellulose ultrathin films by quartz crystal microbalance with dissipation (QCM-D). To study the effect of the location of the carboxylic acid groups on the physicochemical properties, polysaccharides were also oxidized by 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated reaction producing polyuronic acids. The chemo-enzymatically oxidized galacturonic polysaccharides with an unmodified backbone had a better ability to interact with cellulose than the TEMPO-oxidized products. The selectively carboxylated polysaccharides can be further exploited, as such, or in the targeted functionalization of cellulose surfaces.

sted, utgiver, år, opplag, sider
2012. Vol. 13, nr 8, s. 2418-2428
Emneord [en]
Tempo-Mediated Oxidation, Viscoelastic Properties, Regenerated Cellulose, Water, Galactomannans, Xyloglucan, Oxidase, Spruce, Films, Galactoglucomannans
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Identifikatorer
URN: urn:nbn:se:kth:diva-101507DOI: 10.1021/bm300679aISI: 000307422300024Scopus ID: 2-s2.0-84865012014OAI: oai:DiVA.org:kth-101507DiVA, id: diva2:549190
Forskningsfinansiär
Knut and Alice Wallenberg Foundation
Merknad

QC 20120903

Tilgjengelig fra: 2012-09-03 Laget: 2012-08-30 Sist oppdatert: 2017-12-07bibliografisk kontrollert

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