Structural features and Properties of Dietary fiber.

牛蒡的碳水化合物和Yamagobo（Goboazami，Crisium dipsacolepis Matsum.）使用研磨的脱脂样品进行比较。对各组分的糖组成和糖键组成进行了分析，表明它们的基本组成多糖基本相同。Gobo和Yamagobo都含有果聚糖作为储备多糖。Gobo和Yamagobo的细胞壁由果胶物质（鼠李糖半乳糖醛酸聚糖与中性糖），半纤维素（阿拉伯聚糖，木聚糖，半乳聚糖，阿拉伯半乳聚糖和木葡聚糖）和纤维素的比例为53.6：8.0 38.4和55.8：7.2：37.0，分别。果聚糖与细胞壁多糖的比例分别为47：53和66：34。分离并通过甲基化和片段化分析表征。结果表明，该酸性木聚糖具有β-1，4-D-吡喃木糖残基的线性主链，其中约8.3%的β-1，4-D-吡喃木糖残基在2位被4-O-甲基-α-D-吡喃葡萄糖醛酸残基取代。

Carbohydrates of Gobo (edible burdock, Arctium lappa L.) and Yamagobo (Goboazami, Crisium dipsacolepis Matsum.) were compared using triturated, defatted samples. Fractionation of the carbohydrates, and sugar composition and sugar linkage composition analyses of the fractions suggested that their basic constituent polysaccharides are almost the same. Gobo and Yamagobo both contained fructan as a reserve polysaccharide. The cell walls of Gobo and Yamagobo consisted of pectic substances (rhamnogalacturonan with neutral sugars), hemicellulose (arabinan, xylan, galactan, arabinogalactan and xyloglucan) and cellulose in the ratio of 53.6 : 8.0 38.4 and of 55.8 : 7.2 : 37.0, respectively. Approximate ratio of fructan and cell-wall polysaccharides was 47 : 53 for Gobo and 66 : 34 for Yamagobo.An acidic xylan occurring in the hemicellulose II fraction (24 % potassium hydrcydroxide extract) of defatted Gobo (edible burdock, Arctium lappa L.) was isolated and characterized by methylation and fragmentation analyses. The results indicated that the acidic xylan had a linear backbone chain of beta-1,4-D- xylopyranosyl residues, about 8.3 % of which were substituted at the 2 position with 4-O-methyl-alpha-D-glucopyranosyluronic acid residues.