Abstract
Hydrolysates from two hydrothermally treated xylan-rich agrobased materials, Eucalyptus wood and brewery's spent grain were fractionated by anion-exchange chromatography and size-exclusion chromatography. Hereby, several pools were obtained and they were characterised by their sugar composition. Additionally, the oligosaccharides in the pools described were further identified by high-performance anion-exchange chromatography and mass spectrometry. The hydrothermally treated brewery's spent grain resulted in three pools of which two contained relatively high molecular weight xylan, singly and doubly branched with arabinose [XnAm], separated from a pool of xylo-oligosaccharides less branched with arabinose. The fractionation of the hydrothermally treated Eucalyptus wood resulted in a neutral pool, mainly consisting of a series of (acetylated) xylo-oligosaccharides [XnAcm], and three acidic pools. Two of these acidic pools contained a series of (acetylated) xylo-oligosaccharides including one 4-O-methylglucuronic acid [Xn(GlcAme)1Acm], while the third acidic pool contained (acetylated) xylo-oligosaccharides substituted with two 4-O-methylglucuronic acids [Xn(GlcAme)2Acm]. Additionally, a series of xylo-oligosaccharides containing both 4-O-methylglucuronic acid and a hexose, most likely galactose, was detected in the acidic Eucalyptus pools [Xn(GlcAme)1 or 2AcmH]. Information was obtained about the number of acetyl-groups linked to the (4-O-methylglucurono-) xylo-oligosaccharides. Finally, it is demonstrated with an example that the different substituents to the xylo-oligosaccharides present are of relevance for the fermentability of the xylo-oligosaccharides by human faecal samples.
Original language | English |
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Pages (from-to) | 191-200 |
Journal | Carbohydrate Polymers |
Volume | 50 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2002 |
Keywords
- anion-exchange chromatography
- flight mass-spectrometry
- aspergillus-awamori
- arabinoxylans
- barley
- polysaccharides
- spectroscopy
- acids
- malt