Abstract
An arabinogalactan (PBSS2) was fractionated from the bamboo shoot shell of Phyllostachys heterocycla. Structural analysis indicated that PBSS2 was mainly composed of galactose, arabinose, xylose and galacturonic acid in a ratio of 7.8:6.3:1.4:1.0. It was a 1,3- linked β-d-galactan having 61.1% degree of branching at the O-6 positions. The three branches consisting of 1,4-linked β-d-Xylp terminated with β-d-Galp, 1,5-linked α-L-Araf inserted with 1,4-α-6-O-Me-d-GalpA and 1,3,5-linked α-L-Araf terminated by α-L-Araf. Furthermore, its chain conformation on the values of weight-average molecular weight (Mw), the radius of gyration (Rg) and intrinsic viscosity ([η]) were found as following: 7.36 × 104 g/mol, 12.8 nm and 17.7 mL/g, which was evidenced by AFM. The structure exponent of α (0.38) and df (2.17) revealed it existed as a sphere-like chain in NaNO3 aqueous solution. In vitro Caco-2 cells assay showed that PBSS2 presented positive effect on the inhibition of glucose absorption in time-dependent manner at relatively high concentration.
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