Studies on Mucilage from the Seaweed, Eucheuma spinosum (L.) J. Ag.-II:Separation of Pure Mucilage

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The method used by MORI and TSUCHIYA for the study of carrageenin was adopted but immediate filtration of obtained extracts was done by the present author. A cold water extract was first prepared from 100g. of the alga which had been rinsed with fresh water, and then freed from the extract, the material underwent hot water extraction. Filtration of the above two extracts gave rise to a filtrate and a residue for each. Four kinds of fluid were thus obtained with properties as listed in table 1. Partial hydrolysation under conditions tabulated in table 2 was followed by dialysis. Addition of BaCl2 solution and methanol precipitated Ba salts from the liquids. The Ba salts were then dissolved wish hot water and again precipitated by BaCl2. This procedure was repeated several times to get purification of the stuffs. Finally drying in vacuo at a room temperature facilitated analysis as given in table 3. It should be admitted that the materials yielded to analysis were not pure since a small amount of nitrogenous compounds was recognized in them. Yet a ratio of sugar residue to a sulphate was almost the same for the four stuffs, namely, 1:1. Color reaction was the same for the sugar components of the four. This suggests existence of sugar of the same chemical composition in them.
社団法人日本水産学会の論文