Structural characteristics and immunomodulatory activity of raspberry polysaccharide RPP-5

  • YIN Xingxing ,
  • YANG Yongjing ,
  • LU Jie ,
  • WANG Xuehong ,
  • CHAO Mu
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  • 1(School of Ecological and Environmental Engineering, Qinghai University, Xining 810016, China)
    2(Qinghai Raspberry Agricultural Industrialization Co.Ltd., Xining 812100, China)

Received date: 2023-03-18

  Revised date: 2023-04-17

  Online published: 2024-06-11

Abstract

In the present study, a raspberry polysaccharide named RPP-5 was isolated and purified using DEAE-Sepharose Fast Flow and Sephadex G-200.Its structural characteristics and immunomodulatory activity were also explored.The structural characteristics of RPP-5 were studied based on the results of high-performance gel permeation chromatography, Fourier transform infrared spectroscopy, and GC-MS. RAW264.7 cells were utilized to evaluate the immunomodulatory activity of RPP-5.The cell viability, contents of NO and inflammatory factors, and mRNA expression levels of inflammatory factors in RAW264.7 cells were measured by CCK-8 assay, microplate method, enzyme-linked immunosorbent assay assays, and real-time quantitative polymerase chain reaction, respectively.Results showed that RPP-5 was composed of arabinose, glucose, rhamnose, galactose, mannose, and xylose, with a molar ratio of 44.5∶21.7∶5.9∶8.8∶5∶4.1.The average molecular weight, peak molecular weight, and number average molecular weight were 7 598 Da, 7 492 Da, and 6 183 Da, respectively.RPP-5 contained 12 types of glycosyl linkages types, among which →4)-Galp-(1→, →4)-Xylp-(1→, Araf-(1→, →4,6)-Glcp-(1→ were the main connection types of sugar residues, accounted for 26.27%, 16.50%, 11.38%, and 10.41%, respectively.RPP-5 significantly increased the viability of RAW264.7 cells, increased the content of NO, IL-6, IL-1β, and TNF-α, and promoted the expression of IL-6, IL-1β, and TNF-α mRNA in RAW264.7 cells.In conclusion, RPP-5 was a homogeneous acidic heteropolysaccharide with a complex multi-branched structure and showed significant immune-enhancing activity.It could be used as an immunomodulator in functional foods, providing theoretical support for the structural characterization and immunological activity studies of raspberry polysaccharides.

Cite this article

YIN Xingxing , YANG Yongjing , LU Jie , WANG Xuehong , CHAO Mu . Structural characteristics and immunomodulatory activity of raspberry polysaccharide RPP-5[J]. Food and Fermentation Industries, 2024 , 50(9) : 139 -147 . DOI: 10.13995/j.cnki.11-1802/ts.035511

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