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Separation, Purification and Structure Characteristics of Zn-Binding Polysaccharides from Flammulina velutipes

LIU Fang, CHEN Gui-tang, HU Qiu-hui, ZHAO Shu-wen, ZHAO Li-yan   

  1. 1. College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China;
    2. School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
  • Online:2014-03-15 Published:2014-04-04

Abstract:

Objective: To obtain two Zn-binding polysaccharide fractions from Flammulina velutipes and characterizetheir physiochemical, spectroscopic and structural properties. Methods: The Zn-binding polysaccharides were extractedfrom Flammulina velutipes with hot water, purified sequentially by DEAE cellulose-52 and Sephadex G-100 gelcolumn chromatographies and analyzed for Zn contents by flame atomic absorption spectrometry (FAAS) and forhomogeneity by high-performance size-exclusion chromatography (HPSEC). Moreover, their relative molecular weights(Mw) and monosaccharide composition were determined, and the structural characterization was carried out by ultravioletspectroscopy, infrared spectroscopy (FT-IR) and Congo red test. Results: Two major purified fractions named CF1 and CF2were obtained with yields of 20.97% and 12.25%, Zn contents of 191 and 429 μg/g, and average molecular weights of 890and 1 244 kD, respectively. CF1 was composed of 6 monosaccharides such as glucose and galactose, while CF2 was mainlycomposed of 8 monosaccharides such as mannose, fucose and glucose. Both polysaccharide fractions were three helixmolecular structures.

Key words: Flammulina velutipes, Zn polysaccharides, purification, structure characteristics