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http://dx.doi.org/10.3746/jkfn.2016.45.1.052

Convenient Method for Selective Isolation of Immuno-Stimulating Polysaccharides from Persimmon Leaves  

Lee, Sue Jung (Department of Food Science & Biotechnology, Kyonggi University)
Hong, Hee-Do (Korea Food Research Institute)
Shin, Kwang-Soon (Department of Food Science & Biotechnology, Kyonggi University)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.45, no.1, 2016 , pp. 52-60 More about this Journal
Abstract
The biological activity of polysaccharide is greatly influenced by polysaccharide structure and molecular distribution. Here, we developed a rapid and convenient isolation method for fractionating polysaccharides with different characteristics and optimized it using a polysaccharide mixture from Korean persimmon leaves. A crude polysaccharide mixture, persimmon leaves-enzyme (PLE) fraction, was isolated from persimmon leaves digested with pectinase and ethanol precipitation. The PLE fraction was further fractionated with a serially diluted ethanol solution (ethanol : deionized water=4:1, 2:1, 1.5:1, 1:1, and 0.5:1) to produce 10 subfractions (five precipitate fractions labeled from PLE-4 to PLE-0.5 and five supernatant fractions labeled from PLE-4S to PLE-0.5S). HPLC analysis indicated that PLE-4 and -2 consisted of diverse polysaccharides, whereas PLE-1.5, -1, and -0.5 contained high molecular weight (MW) polysaccharides. The fractions from PLE-4 to PLE-1 were mostly composed of 13 different characteristic sugars in rhamnogalacturonan (RG) I and II, and the sugars contained an arabino-${\beta}$-3,6-galactan moiety. However, PLE-0.5 did not contain RG-II or ${\beta}$-arabino-3,6-galactan. Treatment of macrophages with fractions PLE-1.5S and PLE-1S led to a $10{\mu}g/mL$ increase in interleukin (IL)-6 production, whereas treatment with PLE-4S and PLE-2S fractions composed of low MW polysaccharides resulted in reduced levels of IL-6. These results indicate that this isolation method may be useful for the rapid and convenient fractionation of bioactive RGs from polysaccharide mixtures with various properties.
Keywords
persimmon leaves; isolation method; immuno-stimulating activity; polysaccharide; rhamnogalacturonan;
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Times Cited By KSCI : 5  (Citation Analysis)
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