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KMID : 0380619840160030336
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Korean Journal of Food Science and Technology
1984 Volume.16 No. 3 p.336 ~ p.340
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Optimum Conditions for Extracting Alginic Acid from Undaria Pinnatifida and Amino Acid Composition of Its Extraction Residue
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Abstract
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The optimum conditions for extracting alginic acid from the powdered Undaia pinnatifida and amino acid composition of its extraction residue were investigated. Extraction with 60 volumes of 1.0% sodium carbonate solution to the sample at 80 gave a maximum yield of alginic acid and the optimum extraction time was 3 hours when all the other extraction conditions had been satisfied. In the process of precipitating alginic acid gel from algin solution, the highest yield was obtained at pH 2.0 and 1.0 H₂SO₄ was more suitable than 10% HC 1 as a precipitating agent. Extraction residue remained by separating algin solution contained 51.5% (on the dry baiss) of crude protein, and its limiting amino acid and protein score were lysine and 41.5, respectively.
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