| 摘要 |
PROBLEM TO BE SOLVED: To obtain a natural antioxidant containing an extract from the wood part of Pterocarpus santaltinus L. f. as an active ingredient, capable of manifesting a potent antioxidant effect compared with that of conventional products in (un)saturated-based oils and fats such as a palm oil and a corn oil, and useful for a food, a medicine, a cosmetic, etc. SOLUTION: This natural antioxidant contains (A) an extract from the wood part of Pterocarpus santaltinus L. f. belonging to Leguminosae obtained by immersing 10 pts.wt. crushed material obtained by crushing the wood part by a crusher, etc., into 100-200 pts.wt. organic solvent such as methanol, acetone and propylene glycol, extracting under refluxing, and removing the organic solvent from the extract as an active ingredient. The preparations of this agent are e.g. the (A) as it is, a solution obtained by dissolving the (A) in ethanol, etc., or an emulsified composition obtained by emulsifying the (A) in an aqueous solution by using an emulsifier such as a glycerol fatty acid ester. |
