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Title: A hyperbranched β-D-glucan with compact coil conformation from Lignosus rhinocerotis sclerotia
Authors: Hu, T
Huang, QL
Wong, KH 
Yang, H
Gan, JS
Li, YR
Keywords: Lignosus rhinocerotis
Hyperbranched polysaccharide
Compact coil
Chain conformation
Fractal dimension
Issue Date: 2017
Publisher: Elsevier
Source: Food chemistry, 2017, v. 225, p. 267-275 How to cite?
Journal: Food chemistry 
Abstract: An alkali-soluble polysaccharide was extracted from Lignosus rhinocerotis sclerotia (LRP). Its structural characteristics were determined by GC–MS, FT-IR, GC, 1D and 2D NMR combined with Smith degradation and methylation analysis. The LRP had a (1 → 3)-β-D-Glcp backbone with every three residues bearing a (1 → 6)-linked and hyperbranched side chain that contained three (1 → 6)-β-D-Glcp residues as secondary main chain and two terminal β-D-Glcp residues linked at O3. The degree of branching was 0.76 from GC–MS analysis, implying a highly branched structure for LRP. The Mw, <S2>z 1/2, Rh and [η] values of LRP in 0.25 M LiCl/DMSO were measured by SEC-MALLS-Vis-RI combination technology to be 2.88 × 105 g/mol, 30.36 nm, 22.34 nm and 131.50 ml/g, respectively. Furthermore, the exponent α of [η]–Mw, β of <S2>z 1/2–Mw, the fractal dimension df and molecular parameter ρ were determined to be 0.20, 0.33, 2.50 and 1.36, demonstrating that the LRP was a hyperbranched polysaccharide and adopted a compact coil conformation in LiCl/DMSO.
ISSN: 0308-8146
EISSN: 1873-7072
DOI: 10.1016/j.foodchem.2017.01.034
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