粗製ビタミンB_<12>製造に関する研究 : (I)活性汚泥抽出液の活性炭吸着物よりのビタミンB_<12>の溶出

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Kamikubo and Tanaka reported that vitamin B_<12> activity is eluted from carbon cake, on which vitamin B_<12> in activated sludge was adsorbed previously, by using of 60% acetone after washing of the cake with 15% acetone with good yield. In order to economize the solvent and the cost of equipment, experiments were made by using a low concentration of acetone. When 60% acetone is mixed with 10% butanol, carbol or ethyl acetate and the mixture is heated with the cake, vitamin B_<12> is eluted in a higher yield than when 60% acetone is used. When 10% acetic acid, dimethyl amine or 0.1 N sodium bicarbonate is added to the above mixture, the yield of vitamin B_<12> is higher than by using any of the above mixed solutions alone.
日本ビタミン学会の論文