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A polysaccharide JUYP was isolated and purified from Umbilicaria yunnana. The detailed structure of JUYP was studied using gas chromatography (GC), Fourier transform infrared spectroscopy (FTIR), methylation-GC-MS, nuclear magnetic resonance (NMR) and transmission electron microscopy (TEM). A homogeneous polysaccharide JUYP was obtained with the yield of 21.2% and average molecular weight (Mw) of 577 kDa. Monosaccharide composition analysis indicated that JUYP was composed of glucose, galactose and mannose with a molar ratio of 2.310.7.
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