科研之友
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摘要
A water-soluble polysaccharide (P2) with a molecular weight of 1.7 x 10(5) Da was isolated from the hot aqueous extract of flowers of the Chrysanthemum morifolium. It was homogeneous for there was only a symmetrical peak on the spectrum of high-performance gel permeation chromatography. Monosaccharide analysis revealed that P2 is an arabinogalactan containing arabinose (38.4% w/w), galactose (58.8% w/w), and glucose (2.8% w/w) in a ratio of 1: 1.53: 0.07. The GC-MS results of the derived alditol acetates from the permethylated P2 showed some separate peaks corresponding to (1 -> 6)-linked Gal, (1 -> 3,6)-linked Gal, terminal Ara, (1 -> 5)-linked Ara, and (1 -> 3,5)-linked Ara units in a molar ratio of nearly 1.12: 1.90: 1.84: 0.35: 0.12. Terminal Glc unit also existed in a trace amount. H-1, C-13, DEPT-135 and 2D NMR (including HMQC and HMBC), as well as graded acid hydrolysis experiment, indicated that the core structure features include a backbone chain consisting of (1 -> 6)-linked and (1 -> 3,6)-linked Galp residues. Side chains which were composed of terminal Glcp, terminal, (1 -> 5)-linked and (1 -> 3,5)-linked Araf residues were located at position 3. Additionally, P2 showed good immunological activity as it significantly enhanced splenocyte proliferation in relatively low 25 and 50 mu g/mL doses. However, P2 showed little effects of thymocyte proliferation, indicating that it may have two modes of action.
