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Structural elucidation of the main water-soluble polysaccharide from Rubus anatolicus roots.
Carbohydrate Polymers 2017 November 2
An acidic heteropolysaccharide, RAPS-1, was isolated from the roots of Rubus anatolicus by water extraction (70°C) and purification using DEAE-cellulose A52 and Sephadex G-100 column chromatography. The total sugar content and specific optical rotation of RAPS-1 were 96.3% and +196°, respectively. RAPS-1 had a molecular weight of 7900Da, and was composed of glucose, galactose, and glucuronic acid with a relative molar ratio of 6.2: 1.0: 1.2. Structural features of RAPS-1 were elucidated by a combination of partial acid hydrolysis, periodate oxidation and Smith degradation, methylation, GC-MS, FTIR, and NMR (13 C and 1 H) analysis. The results indicated that RAPS-1 had a backbone of →4)-α-d-Glcp-(1→ residues, with branches attached to O-6 by α-d-Galp-(1→ and by α-d-GlcAp-(1→.
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