| 摘要 |
PROBLEM TO BE SOLVED: To inexpensively obtain the subject highly concentrated compounds in a simple process by subjecting a plant material to a specific extraction treat ment. SOLUTION: The polyphenol compounds are obtained by the following process: a plant material is subjected to extraction treatment with water at <=40 deg.C; thereafter, the resulting extraction residues are subjected to extraction treatment with an aqueous alkaline solution (e.g. a 0.05-5% aqueous solution of sodium hydroxide) at >=70 deg.C to extract the objective polyphenol compounds, the extract aqueous solution mentioned above is subjected to adsorbent treatment to adsorb the objective polyphenol compounds alone, thereafter, both the treatment solutions afforded from the extraction residues and the extract aqueous solution are then mixed together to obtain the objective high-purity polyphenol compound in high yield, wherein the plant material to be used is pref. at least one kind of plant selected from teas, cacao, rosemary, clove, cinnamon, or the like. The polyphenol compounds thus obtained are usable as ingredients for antioxidants, active oxygen scavengers, deodorizing agents, or the like, through formulation.
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