Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 147, Issue -, Pages 844-852Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2019.09.244
Keywords
Zizyphus jujuba cv. Muzao; Polysaccharide; Pectin; Characterization; NMR
Funding
- National Natural Science Foundation of China [21502177]
- Program for Science and Technology Innovation Talents in Universities of Henan Province [20HASTIT037]
- Basic Research Plan of Higher Education School Key Scientific Research Project of Henan Province [19zx012]
- Higher Education School Young Backbone Teacher Training Program of Henan Province [2018GGJS093]
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Jujube (Zizyphusjujuba Mill.) have been widely used as a health food and medicinal herb in oriental medicine. In the present study, a novel galacturonic add-rich polysaccharide (PZMP3-2) was isolated from ZizyphusJujuba cv. Muzao through hot water extraction, ethanol precipitation, and purification with DEAE-Sepharose Fast Flow and Sephacryl 5-300 column chromatography. The chemical structures of PZMP3-2 were elucidated by met hylation analysis, along with HPGPC, FT-IR spectroscopy, GC-MS, D-1 NMR spectroscopy, and D-2 NMR spectroscopy. Its morphological properties were further characterized by SEM, AFM, and XRD. Monosaccharide compositional analysis of PZMP3-2 revealed the presence of rhamnose, arabinose, galactose, and galacturonic acid at a molar ratio of 1.74:2.00: 1.00:18.69, and the HPGPC data demonstrated an average molecular weight of 58.21 kDa. Structural and linkage analysis by GC-MS and NMR spectroscopy suggested that PZMP3-2 was a homogalacturonan (HG)-like pectic polysaccharide branched at C-2 with some Araf and Rhap residues. Such unique structure of PZMP3-2 may indicate distinct bioactivities and further application in food and even clinic. (C) 2019 Elsevier B.V. All rights reserved.
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