Seeds of Astragalus cicer L. (Fabaceae) afforded a galactomannan (5.90% yield of seed mass) of molecular weight 1064 kDa, solutions of which had high viscosity [η] 925.5 mL/g and optical activity [α]D +71.9°. The galactomannan consisted of galactose and mannose units in a 1:1.39 ratio. Physicochemical methods established that the main chain of the polysaccharide consisted of 1,4-β-D-mannopyranose units substituted at 72% of the C-6 positions by single α-D-galactopyranose units. The content of variously substituted galactose mannobiose units Man–Man, (Gal)Man–Man/Man–Man(Gal) and (Gal)Man–Man(Gal) in the galactomannan were 18.7, 19.8, and 61.5%, respectively.
鹰嘴豆黄
芪(豆科)的种子中提取出一种
半乳甘露聚糖(种子质量的5.90%),分子量为1064 kDa,其溶液具有高粘度[η] 925.5 mL/g和光学活性[α]D +71.9°。该
半乳甘露聚糖由半
乳糖和
甘露糖单元以1:1.39的比例组成。物理
化学方法确定,该
多糖主链由1,4-β-D-甘露
吡喃糖单元组成,其中72%的C-6位置被单个α-
D-半乳
吡喃糖单元取代。不同取代程度的半
乳糖甘露二糖单元Man–Man,(Gal)Man–Man/Man–Man(Gal)和(Gal)Man–Man(Gal)在
半乳甘露聚糖中的含量分别为18.7%、19.8%和61.5%。