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Rheological properties of polysaccharides from Dioscorea opposita Thunb. 2017

Fanyi Ma, and Yun Zhang, and Nanhua Liu, and Jie Zhang, and Gaixiu Tan, and Balan Kannan, and Xiuhua Liu, and Alan E Bell
Key Laboratory of Natural Medicine and Immune-Engineering of Henan Province, Key Laboratory for Special Functional Materials of Ministry of Education, Pharmaceutical College, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China.

This study investigated the chemical components and rheological properties of polysaccharides from Dioscorea opposita Thunb. Graded alcohol precipitation was used to extract Dioscorea opposita polysaccharide samples (S1, S2, S3 and S4). The monosaccharides, amino acid content and molecular weight of each sample were measured and compared. The rheological properties of the polysaccharide samples at different concentrations, temperatures and pH values were studied. The rheological properties of S1, S2 and S3 exhibited pseudoplastic properties and "gel-like" behaviour. The viscosity of S1 was improved with rising temperatures, especially temperatures higher than 80°C, which may be caused by the starch gelatinisation. The acidic and basic environments may break the structures of S3 and S4. However, the extreme conditions improved the viscosity of S1. This work was a basic investigation of the Dioscorea opposita polysaccharides, contributing to the function of yam products and applications of natural thickeners in the food industry.

UI MeSH Term Description Entries
D008970 Molecular Weight The sum of the weight of all the atoms in a molecule. Molecular Weights,Weight, Molecular,Weights, Molecular
D010936 Plant Extracts Concentrated pharmaceutical preparations of plants obtained by removing active constituents with a suitable solvent, which is evaporated away, and adjusting the residue to a prescribed standard. Herbal Medicines,Plant Extract,Extract, Plant,Extracts, Plant,Medicines, Herbal
D011134 Polysaccharides Long chain polymeric CARBOHYDRATES composed of MONOSACCHARIDES linked by glycosidic bonds. Glycan,Glycans,Polysaccharide
D012212 Rheology The study of the deformation and flow of matter, usually liquids or fluids, and of the plastic flow of solids. The concept covers consistency, dilatancy, liquefaction, resistance to flow, shearing, thixotrophy, and VISCOSITY. Flowmetry,Velocimetry,Velocimetries
D014783 Viscosity The resistance that a gaseous or liquid system offers to flow when it is subjected to shear stress. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed) Viscosities
D027742 Dioscorea A plant genus best known for edible underground tubers. Yam may also refer to a moist variety of sweet potato, IPOMOEA BATATAS. Yam,Chinese Yam,Dioscorea batatas,Dioscorea opposita,Dioscorea polystachya,Dioscorea villosa,Shan Yao,Wild Yam,Chinese Yams,Shan Yaos,Wild Yams,Yam, Chinese,Yam, Wild,Yams,Yams, Chinese,Yams, Wild,Yao, Shan,Yaos, Shan

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