Acta Agriculturae Zhejiangensis ›› 2023, Vol. 35 ›› Issue (8): 1888-1895.DOI: 10.3969/j.issn.1004-1524.20221009

• Food Science • Previous Articles     Next Articles

Comparative studies of polysaccharides of three Dendrobium species from Zhejiang Province and exploration of their physiological functions

LI Jingrui1(), TAO Wenyang2, YANG Ying2, ZHOU Wanyi2, LU Shengmin2,*(), WANG Yangguang1,*()   

  1. 1. College of Food and Medicine, Zhejiang Ocean University, Zhoushan 316022, Zhejiang, China
    2. Institute of Food Science, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
  • Received:2022-07-07 Online:2023-08-25 Published:2023-08-29

Abstract:

To comparatively study the basic physicochemical properties and immunological efficacy of the three Dendrobium officinale(D. officinale) stems polysaccharides from the industrial base of Yandang Mountain, and to provide reference for their precise utilization, in this paper, polysaccharides from D. officinale cv. Yanhu 1 (DOP1), D. officinale cv. Yanhu 3 (DOP2) and D. officinale cv. Shenglan 8 (DOP3) were extracted. Their monosaccharide composition, total sugar content, molecular weight and monosaccharide linkages were respectively analyzed by high performance liquid chromatography (HPLC), phenol-sulfuric acid method, high performance gel permeation chromatography (HPGPC) and fourier transform infrared spectrometer (FT-IR). Their effects on immune function were further investigated. The results showed that all the three polysaccharides contained three polysaccharide fractions with different relative molecular weights, and DOP2 having the highest relative molecular weights. All the three DOP consisted of four monosaccharides, including arabinose, galactose, glucose and mannose, but they had different monosaccharide ratios. Their results of FT-IR spectra were almost the same, which showed the presence of pyran heteropolysaccharides with a predominantly β-configuration. All the three polysaccharides had certain proliferative effects on RAW 264.7 cells and the DOP3 was the best (P<0.000 1). In addition, DOP3 (1 600 μg·mL-1) significantly promoted the release of NO from RAW 264.7 cells (P<0.05). The results indicated that there were significant differences in the physicochemical properties and immune efficacy of the three polysaccharides, and the immunomodulatory activity of DOP3 was superior to the other two Dendrobium polysaccharides, which might be related to their differences in structure and composition.

Key words: Dendrobium officinale, polysaccharide, molecular weight, monosaccharide composition, immunomodulation

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