天然ビタミン油よりビタミンA濃縮物を経済的に製造する方法の研究-V : 鹸化法によるビタミンAの濃縮(その3)液々抽出法
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As it was found in the previous studies that the precipitating method was not suitable for the economical manufacture of vitamin A concentrate comparable with synthetic one, we made an attempt to obtain vitamin A concentrate by liquid-liquid extraction. In the present study, benzene is adopted as a solvent to extract vitamin A for economical consideration. When benzene is used for solvent, main difficulty in the extraction consists in formation of emulsion produced with benzene and soap solution. However, by removing excess alkali present in soap solution, we can prevent the emulsification and easily extract vitamin A from concentrated soap solution (Table1) The following method A or B is taken for removing excess alkali. Method A…CO3 gas is blown into the soap solution after saponification, and precipitated soap is filtered (sodium salt-methanol method described in the previous paper). Benzene extraction is performed on the resultant solution. Method B…In order to make the soap not precipitated, benzene is added to the saponified solution treated as well by CO2 gas. Produced precipitate mainly consisting of Na2CO3 is filtered and benzene extraction is performed on the resultant solution. It should be noted that when liver oils containing large amounts of glyceryl ether such as bathyl or selachyl alcohol are used for the starting oil, soap is transferred into benzene layer with glyceryl ether and such soap cannot be removed by our method (Table2). Manufacture of vitamin A concentrate from such liver oils needs further investigations.
- 公益社団法人 日本水産学会の論文