کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8328088 1540203 2018 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structural and rheological studies of a polysaccharide mucilage from lacebark leaves (Hoheria populnea A. Cunn.)
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Structural and rheological studies of a polysaccharide mucilage from lacebark leaves (Hoheria populnea A. Cunn.)
چکیده انگلیسی
A water-soluble mucilage extracted from the leaves of Hoheria populnea was chemically and physically studied. Monosaccharide composition and linkages were determined by high performance anion exchange chromatography (HPAEC), gas chromatography-mass spectrometry (GC-MS) and nuclear magnetic resonance (NMR) spectroscopy. Lacebark mucilage was composed of rhamnose, galactose, galacturonic acid and glucuronic acid (2:1:2:1). Proton and 13C NMR spectroscopy, and linkage analysis, revealed a predominantly rhamnogalacturonan I-type (RG I-type) structure comprising of a backbone of → 4]-α-D-GalpA-[1 → 2]-α-L-Rhap-[1 →. Data indicated the mucilage likely comprises of a polymer containing several structurally discrete domains or possibly more than one discrete polymer. One domain contains a RG I-type backbone with branching at O-3 of GalpA residues to terminal β-D-GlcpA residues, another similarly contains a RG I-type backbone but is branched at O-4 of the Rhap residues to terminal GalpA residues or oligosaccharides containing α-linked 4-Galp and terminal GalpA residues. A possible third domain contains contiguous 2-Rhap residues, some branched at O-3. Hydrated mucilage exhibited pseudoplastic flow behaviour and viscoelastic properties of an entangled biopolymer network. These rheological behaviours were only slightly affected by pH and may prove advantageous in potential end-product applications including oral pharmaceuticals or as a food ingredient.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Biological Macromolecules - Volume 111, May 2018, Pages 839-847
نویسندگان
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