Fine structures of different dextrans assessed by isolation and characterization of endo-dextranase liberated isomalto-oligosaccharides
| Autor: | Daniel Wefers, Franziska Münkel |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Chromatography
Polymers and Plastics biology Organic Chemistry 02 engineering and technology Nuclear magnetic resonance spectroscopy 010402 general chemistry 021001 nanoscience & nanotechnology Mass spectrometry biology.organism_classification 01 natural sciences 0104 chemical sciences Lactic acid chemistry.chemical_compound Hydrolysis Monomer Dextran chemistry Materials Chemistry Side chain 0210 nano-technology Bacteria |
| Zdroj: | Carbohydrate Polymers. 215:296-306 |
| ISSN: | 0144-8617 |
| DOI: | 10.1016/j.carbpol.2019.03.027 |
| Popis: | Chromatographic analysis of endo-dextranase liberated branched oligosaccharides proved to be a valuable approach to differentiate dextrans from fermented food products or isolated lactic acid bacteria. Because these hydrolysis products also yield valuable information on the dextran fine structures, several branched isomalto-oligosaccharides were liberated from different dextrans and chromatographically purified. Mass spectrometry and two-dimensional NMR spectroscopy were used for structural characterization of the oligomers. Isomalto-oligosaccharides from L. reuteri TMW 1.106 dextrans were exclusively O4-branched. Furthermore, they contained only monomeric side chains and at least one unsubstituted backbone unit between ramified residues. In contrast, O3-branched oligosaccharides with monomeric as well as elongated side chains were isolated. The varying abundance of the O3-branched oligosaccharides suggests that side chain length is a major factor for structural differences between dextrans. Overall, we demonstrated that chromatographic analysis of endo-dextranase liberated isomalto-oligosaccharides provides valuable information on the structural properties and supplements conventional methods such as methylation analysis. |
| Databáze: | OpenAIRE |
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