期刊
CARBOHYDRATE POLYMERS
卷 227, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2019.115362
关键词
Bletilla striata polysaccharide; Fibrous root; Antioxidant activity; Galactomannan
资金
- National Key R&D Program of China [2017YFD0400803, 2018YFC1604400]
- Shanghai Agricultural Achievement Transformation Project [143919N0502]
- Shanghai Agriculture Applied Technology Development Program, China [2018-02-08-00-08-F01545]
- Shanghai Biomedical key Program [17391901302]
- Shanghai Technique Standard Special Program [17DZ2203300]
- Shanghai Yuemu cosmetics Co., Ltd entrusted Program -R&D of Natural Plants, Shanghai Food Safety and Engineering Technology Research Center [19DZ2284200]
A new polysaccharide (pFSP) was first isolated from the originally discarded fibrous roots part of Chinese traditional herb, Bletilla striata. pFSP was composed of D-glucose, D-galactose and D-mannose in a molar ratio of 1: 2.03: 3.45 with molecular weight of 9.1 x 10(4)Da. It could effectively scavenge DPPH and superoxide radicals with inhibition rate of 64.47% and 72.27% at 5.0 mg/ml, higher than that of polysaccharide from Bletilla striata tuber. Structural investigations of the periodate oxidation studies and Smith-degradation as well as the FT-IR spectroscopy were performed, and combined with 1D and 2D NMR spectroscopy, the repeating unit of pFSP contained (1 -> 4)-linked-alpha-D-Glcp, (1 -> 4) linked-beta -D Manp and (1 -> 3,6) linked-beta-D-Manp units, together with the branches of (1 -> 6)-linked-beta-D-Galp and terminated with (1 ->) linked-beta-D-Manp residue.
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