Studies on the Preparation of Agar-agar from Gracilaria confervoides (Part 2)

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As already reported in previous paper, the writers found that the following reaction is taken place in the body of Gr. confervoides when it is treated with dilute alkaline solution containing Ca++ at suitable temperature. R<O•SO2•O O•SO2•O>R'+CaCl2+2NaOH→R<O•SO2•O O•SO2•O>Ca+R'OH+2NaCl+H2O In this connection, some detailed experiments were carried out. When Gr. confervoides is treated with dilute alkaline solution at the temperatures of from 50°C to 90°C for 3 hours, colloidal matter (R<O•SO2•O O•SO2•O>R') contained in it is decomposed by NaOH and it goes into extracts as follows: R<O•SO2•O O•SO2•O>R'+2NaOH→ROH+R'OH+Na2SO4 Therefore, R<O•SO2•O O•SO2•O>Me remains in the body of Gr. confervoides. Next, it was treated with dilute alkaline solution containing Ca++ at the temperatures of from 70°C to 95°C for 3 hours. From the various results obtained it is concluded that one of the saccharide radicales of R<O•SO2•O O•SO2•O>R' contained is substituted with Ca and changed to reversible colloide R<O•SO2•O O•SO2•O>Ca in its body.
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