摘要
本文报道了,对我国沿海野生马尾藻和人工养殖海带所含褐藻胶的提取、化学降解分级、原始褐藻胶及其分级产物 M/G 比值和粘均分子量的测定结果,并试验了各产物对^(85)Sr在动物肠道内的阻吸效果。测试结果表明,南方产马尾藻的褐藻胶M/G比值低,北方海带的M/G比值高;褐藻酸钠的草酸水解物G含量提高,M/G比值下降显著。而 MgCl_2-EtOH 分级产物的M/G 比值下降较少;水解后的马尾藻褐藻胶的粘均分子量及聚合度都普遍下降;在动物肠道内,草酸水解前后的褐藻胶对^(85)Sr有明显的阻吸效用,其中以裂叶马尾藻褐藻胶的阻吸效果最好。裂叶马尾藻褐藻胶的草酸水解产物对^(1?)Ba 也有显著的阻吸效果。
The ratios of mannuronic acid (M) to guluronic acid (G) of sodium alginatesextracted from 9 species of brown seaweeds, Sargassums and Laminariea, collectedalong the coast of China, were determined. Among them, Sargassum siliquastrum andS. henslowianum have higher content of G and lower M/G ratios of about 1, and La-minaria has higher content of M and higher M/G ratio of 2. The M/G ratios are lowered from 1.13 in the original alginate to 0.16 in thefractionation product after oxalic acid hydrolysis for S. siliquastrum, from 0.82 to0.14 for S. henslowianum and from 2.01 to 0.09 for Laminaria. But those of thefractionation products by MgCl_2-EtOH precipitation are less lowered. The average molecular weight and degree of polymerization of the sodiumalginates tested are generally decreased after oxalic acid hydrolysis to about 2,000 and10, respectively. The inhibition efficiencies of sodium alginates from differient species of brownseaweeds prior and after oxalic acid hydrolysis on the absorption of ^(85)Sr in the gastro-intestinal duct of rat indicate that the sodium alginate from Sargassum siliquastrumgives the best efficiency, enhancing from 66% prior hydrolysis to 78% after hydro-lysis, followed by that from S. henslowianum, incroasing from 56% to 64% and by that from Laminaria, from 27% to 56%, respectively. The inhibition efficiency of sodium alginate from S. siliquastrum on the absor-ption of a mixture of ^(183)Ba, ^(85)Sr and ^(47)Ca indicates that it is remarkably effective on^(183)Ba, increasing from 14% before hydrolysis to 77% after oxalic acid hyrolysis.
出处
《水产学报》
CAS
1982年第4期321-329,共9页
Journal of Fisheries of China
