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Hypoglycemic Effect of Chinese Yam (Dioscorea opposita rhizoma) Polysaccharide in Different Structure and Molecular Weight


Three new Chinese yam polysaccharides (namely HSY, huaishanyao in Chinese) were isolated using the methods of boiled water extraction and stepwise ethanolic precipitation, combined with the tangential flow ultrafiltration membrane system. Their molecular weights were determined by high performance gel permeation chromatography. Three type yam polysaccharides in different molecular weight were isolated: HSY‐I (>50 kDa), HSY‐II (10 to 50 kDa), HSY‐III (<10 kDa). The monosaccharide and glycosidic bond links composition were analyzed with GC and Smith degradation. The structure characteristics were further discussed combined with infrared spectrophotometry. Dexamethasone‐induced insulin resistance glucose/lipid metabolism diabetic mice model was established to evaluate the hypoglycemic effect of different concentration of HSY and different molecular weights polysaccharide HSY‐I, HSY‐II, and HSY‐III. The results indicated that the HSY polysaccharide mixture, HSY‐I and HSY‐II had hypoglycemic effect.

Practical Application

Three polysaccharides from Chinese yam tuber were isolated in this study. Their structures were characterized and hypoglycemic effects were evaluated. The result clearly identified the benefits of this plant as a healthy functional food.

Authors:   Qian Li, Wenzhi Li, Qunyu Gao, Yuxiao Zou
Journal:   Journal of Food Science
Volume:   82
edition:   10
Year:   2017
Pages:   2487
DOI:   10.1111/1750-3841.13919
Publication date:   14-Sep-2017
Facts, background information, dossiers
  • food
  • flow
  • concentration
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