Abstract
Osmunda japonica Thunb, as a traditional edible wild herb in China, has a wide range of pharmacological effects. In this study, two pectic polysaccharides, WOJP-A-b and WOJP-A-c, were obtained from O. japonica stalks by water extraction and alcohol precipitation method, and their fine structures were investigated. Monosaccharide composition and molecular weight analyses showed that WOJP-A-b (10.6 kDa) was mainly composed of galacturonic acid (GalA), with less galactose (Gal) and arabinose (Ara) (molar ratio = 68.3: 12.5: 9.0), while WOJP-A-c (6.6 kDa) was primarily composed of GalA, Gal, Ara, and rhamnose (Rha) residues in a molar ratio of 39.4: 41.2: 11.8: 6.8. The results indicated that WOJP-A-b consisted of esterified homogalacturonan (HG) domains, while WOJP-A-c contained HG domains, as well as 1,4-β-galactan and 1,5-α-arabinan, which might be linked covalently to the minor rhamnogalacturonan I (RG-I) domains. The results of this study will provide the basis for structure-activity relationship studies of O. japonica polysaccharides and development of natural functional foods and pharmaceuticals.
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