Zhang Quanbin, Qi Huimin, Zhao Tingting, Deslandes Eric, Ismaeli Ninasayaeli Mbise, Molloy F, Critchley Alan T
Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China.
Carbohydr Res. 2005 Oct 31;340(15):2447-50. doi: 10.1016/j.carres.2005.08.009.
The structure of a polysaccharide from the red seaweed, Porphyra capensis, growing along the coast of Namibia and South Africa was investigated. Algae growing at different sites and collected at different times gave a polysaccharide extract with similar chemical components. FTIR and NMR spectral analysis showed that the polysaccharide from P. capensis had a typical porphyran structure. It has the linear backbone of alternating 3-linked beta-D-galactose and 4-linked alpha-L-galactose-6-sulfate or 3,6-anhydro-alpha-L-galactose units. The ratio of alpha-L-galactose-6-sulfate and the 3,6-anhydrogalactose is 1.2:1, as reflected by a 1H NMR spectrum. A high degree of methylation occurred at the C-6 position of the D-galactose units. The degree of methylation was 0.64 for the D-galactose residues.
对生长在纳米比亚和南非海岸的红海藻——南非紫菜（Porphyra capensis）中的一种多糖结构进行了研究。在不同地点生长且于不同时间采集的藻类产生了具有相似化学成分的多糖提取物。傅里叶变换红外光谱（FTIR）和核磁共振光谱（NMR）分析表明，南非紫菜中的多糖具有典型的紫菜聚糖结构。它具有由交替的3-连接的β-D-半乳糖和4-连接的α-L-半乳糖-6-硫酸盐或3,6-脱水-α-L-半乳糖单元组成的线性主链。如1H NMR光谱所示，α-L-半乳糖-6-硫酸盐与3,6-脱水半乳糖的比例为1.2:1。D-半乳糖单元的C-6位发生了高度甲基化。D-半乳糖残基的甲基化程度为0.64。
