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首页> 外文期刊>Botanica Marina >Tissue age as a factor affecting carrageenan quantity and quality infarmed Kappaphycus striatum (Schmitz) Doty ex Silva
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Tissue age as a factor affecting carrageenan quantity and quality infarmed Kappaphycus striatum (Schmitz) Doty ex Silva

机译：组织年龄是影响角叉菜（Kappaphycus striatum（Schmitz））的角叉菜胶数量和质量的因素

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摘要

Carrageenan yield and quality from young and old tissues of Kappaphycus striatum "sacol" green variety were investigated using native and alkali-modified carrageenan extraction procedures. Dried apical (young) and basal (old) segments were pooled to produce 5 g of dried samples of each for carrageenan extraction. Mature tissues yielded greater amounts of carrageenan than young tissues. The latter exhibited higher gel strength, cohe-siveness, viscosity properties and lower average-molecular weight than the mature, old tissues. FT-IR and super(13)C and super(1)H NMR analyses showed that both young and old tissues contained mostly the kappa-type repeating disaccharide sequences of 3-linked beta -D-galactopyranose 4-sulfate (G4S) and 4-linked 3,6-anhydro- alpha -D-galacto-pyranose (DA). Moreover, the study showed that, as the algal thalli aged, the iota carrageenan (G4S-DA2S) and methlylated (G6M) carrageenan units (these were minor substituents in the major kappa-carrageenan repeating disaccharide unit) decreased in quantity. These differences suggest that the timing of galactan biosynthesis may be related to certain physiological and structural functions during the growth of the alga.
机译：使用天然和碱改性的角叉菜胶提取程序研究了Kappaphycus striatum“ sacol”绿色变种的年轻和旧组织中的角叉菜胶产量和质量。合并干燥的顶端（年轻）和基底（老）片段，以产生5g干燥的样品，每个样品用于角叉菜胶提取。成熟的组织比年轻的组织产生更多的角叉菜胶。与成熟的旧组织相比，后者显示出更高的凝胶强度，凝聚力，粘度特性和更低的平均分子量。 FT-IR和super（13）C和super（1）H NMR分析表明，年轻和老组织都主要含有3联β-D-吡喃半乳糖4-硫酸盐（G4S）和4的kappa型重复二糖序列。 -连接的3，6-脱水-α-D-半乳糖吡喃糖（DA）。此外，研究表明，随着藻藻的老化，iota角叉菜胶（G4S-DA2S）和甲基化（G6M）角叉菜胶单元（在主要kappa-角叉菜胶重复二糖单元中是次要的取代基）的数量减少。这些差异表明半乳聚糖生物合成的时间可能与藻类生长过程中某些生理和结构功能有关。

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