| 摘要 |
PURPOSE:To provide an antioxidant efficiently from diatom, by extracting diatom with a polar organic solvent and removing the solvent from the extract soln. CONSTITUTION:An extract soln. is prepd. by contacting dried diatom with a polar organic solvent and the solvent is removed from the soln. to obtain an antioxidant. To increase the efficiency of extraction, it is preferable that water is removed from diatom by centrifugal separation, etc. and the diatom is dried by ventilation. An extract with a stronger antioxidant action is obtd. when the drying and extraction are performed at a temp. not much higher than normal temp., pref. below 40 deg.C. The extract is oily or semi-solid and, when added to fish oil, for example, it shows an antioxidant action equal to or stronger than that of butylhydroxytoluene or vitamin E used as edible antioxidant.
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