FUDAMENTAL STUDIES ON THE PRODUCTION OF ALGINIC ACID-III:ON THE CHANGE OF MEMBRANE POTENTIAL OF ALGAE BY ACID TREATMENT

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Membrane potential of brown algae, Laminaria japonica, as ion-exchange membrane was measured using an apparatus shown in Fig. 1, in order to reexamine the optimal condition of acid pre-treatment in alginic acid production, the condition which was previously reported1). Results obtained were as follows: 1. Though the amount of calcium extracted increases in acid solution, the algae seems to become not so porous during acid treatment, its degree of swelling being less in acid solution than in water. 2. Change of membrane potential of the algae by acid treatment shows the same tendency as the change of the extraction amount of calcium (Fig. 2). 3. The effect of acid treatment of the algae on alginic acid extraction is stronger when the algae is exhaustively washed with water after acid treatment for 1 hr. in dry state, compared to when treated with acid for a short time in swelling state. 4. A 0.2N mineral acid is most suitable for the acid treatment (Fig. 3). From these results, the following acid pre-treatment is recommened in alginic acid production: The dried algae is treated with 0.2N mineral acid for 1 hr. at room temperanre (10°-30°C), and then completely washed with water to remove the acid.
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