PROBLEM TO BE SOLVED: To provide a method for improving the antimicrobial activity of saponin.SOLUTION: A method for improving the antimicrobial activity of saponin is performed by heat treating saponin under the acidic condition. The saponin is soybean saponin.COPYRIGHT: (C)2013,JPO&INPIT【課題】サポニンの抗微生物活性を向上させる方法の提供。【解決手段】サポニンを酸性条件下で加熱処理することによるサポニンの抗微生物活性の向上方法。【選択図】なし