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Immunomodulating Activity of Crude Polysaccharide from Inonotus obliquus Sclerotia by Fractionation including MeOH Reflux

  • Lee, Kyung-Haeng (Dept. of Food and Nutrition, Korea National University of Transportation) ;
  • Kim, Hoon (Dept. of Integrated Biomedical and Life Science, Korea University) ;
  • Oh, Sung-Hoon (Dept. of Food Science and Biotechnology, Shin Ansan University) ;
  • Hwang, Jong-Hyun (Dept. of Food and Nutrition, Korea National University of Transportation) ;
  • Yu, Kwang-Won (Dept. of Food and Nutrition, Korea National University of Transportation)
  • Received : 2016.12.19
  • Accepted : 2017.02.01
  • Published : 2017.02.28

Abstract

To obtain the immunomodulating polysaccharide from chaga mushroom (Inonotus obliquus sclerotia, IO), crude polysac- charide fractions (IO-M-CP and IO-CP, respectively) prepared from hot-water extract (IO-W) of I. obliquus by EtOH precipitation after MeOH reflux or not. After IO-W was re-dissolved in water followed by EtOH addition in the case without MeOH reflux, EtOH mixture was fractionated into EtOH-soluble (IO-E) and crude polysaccharide (IO-CP). In the meanwhile, MeOH-soluble fraction (IO-M) was separated from IO-W after MeOH reflux. The residue was dissolved in water and was added by EtOH, and then EtOH mixture was also fractionation into EtOH-soluble (IO-M-E) and crude polysaccharide (IO-M-CP). As a result of the macrophage stimulating activity of these fractions, IO-CP and IO-M-CP showed significantly increased cell proliferation and cytokines production than IO-W. Particularly, IO-M-CP promotes the production of IL-12 more than IO-CP. In the splenocytes proliferating activity and intestinal immune system modulating activity through Peyer's patch, both of 2 crude polysaccharide fractions were significantly promoted in cell proliferation and cytokines production than IO-W, and IO-M-CP was more potent than IO-CP in IL-2 production from splenocytes and GM-CSF production ($10{\mu}g/mL$) in Peyer's patch cells. In addition, immunomodulating polysaccharide fractions (IO-M-CP and IO-CP) prepared from IO-W by EtOH precipitation with or without EtOH reflux showed no significant difference in the chemical composition and component sugar. These results suggested that MeOH reflux might exclude low-molecular weight materials from IO-W and consequently increase the immunomodulating activity of IO-M-CP. Therefore, it was confirmed that immunomodulation of polysaccharide prepared from hot-water extract of chaga mushroom was enhanced by fractionation including MeOH reflux and EtOH precipitation.

Keywords

References

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