Heaney-Kieras J, Chapman D J
Carbohydr Res. 1976 Dec;52:169-77. doi: 10.1016/s0008-6215(00)85957-1.
Partial acid hydrolyzates of the extracellular polysaccharide from Porphyridium cruentum yield three disaccharides and two uronic acids. These constitute all of the uronic acid in the polymer. The novel disaccharides are 3-O(alpha-D-glucopyranosyluronic acid)-L-galactose, 3-O-(2-O-methyl-alpha-D-glucopyranosyluronic acid)-D-galactose, and 3-O-(2-O-methly-alpha-D-glucopyranosyluronic acid)-D-glucose. The polyanion of high molecular weight contains D- and L-galactose, xylose, D-glucose, D-glucuronic acid and 2-O-methyl-D-glucuronic acid, and sulfate in molar ratio (relative to D-glucose) of 2.12:2.42:1.00:1.22:2.61. Preliminary periodate-oxidation studies suggest that the hexose and uronic acids are joined to other residues by (1 leads to 3) glycosidic linkages. About one-half of the xylose residues are (1 leads to 3)-linked.
紫球藻胞外多糖的部分酸水解产物产生三种二糖和两种糖醛酸。这些构成了聚合物中所有的糖醛酸。新型二糖为3 - O（α - D - 吡喃葡萄糖醛酸）- L - 半乳糖、3 - O -（2 - O - 甲基 - α - D - 吡喃葡萄糖醛酸）- D - 半乳糖和3 - O -（2 - O - 甲基 - α - D - 吡喃葡萄糖醛酸）- D - 葡萄糖。高分子量的聚阴离子含有D - 和L - 半乳糖、木糖、D - 葡萄糖、D - 葡萄糖醛酸和2 - O - 甲基 - D - 葡萄糖醛酸，以及硫酸根，其与D - 葡萄糖的摩尔比为2.12:2.42:1.00:1.22:2.61。高碘酸盐初步氧化研究表明，己糖和糖醛酸通过（1→3）糖苷键与其他残基相连。约一半的木糖残基是（1→3）连接的。
