Journal
BIOMACROMOLECULES
Volume 11, Issue 12, Pages 3395-3405Publisher
AMER CHEMICAL SOC
DOI: 10.1021/bm100902d
Keywords
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Funding
- Fork Ying-Tong Education Foundation of China [104036]
- National Natural Science Foundation of China [20974130, 20574089]
- Fundamental Research Funds for the Central Universities of China [lgpy14]
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An acidic tea polysaccharide (ALTPS), isolated from green tea (Camellia sinensis), was characterized as a hyperbranched glycoprotein containing the acidic heteropolysaccharide chains and the protein residues from the results of UV-vis, FTIR, one- and two-dimensional NMR, GC, GC-MS, and amino acid analyses. Solution properties of ALTPS were investigated by static and dynamic light scattering analyses and viscometry. The results indicated that the viscosity behavior of ALTPS exhibited a typical polyelectrolyte effect in distilled water, which may be avoided by adding salts. The low intrinsic viscosity of ALTPS in the solutions (8-15 mL/g) is attributed to its hyperbranched structure. By application of the polymer solution theory, it was revealed that ALTPS was present in a sphere-like conformation in the solutions as a result of the hyperbranched structure. The TEM image further confirmed that ALTPS existed in a spherical conformation in aqueous NaCl solution. Glucose was absorbed by ALTPS, which may be one of blood glucose lowering mechanisms of tea polysaccharides.
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