PROBLEM TO BE SOLVED: To provide a shelf life improver for food having satisfactory effect on storage of food, having no influence on the taste and quality of the food, and having favorable dispersibility in the food.SOLUTION: The shelf life improver for food contains hardly water-soluble polyphenol powder having an average particle diameter of 1-15 &mum and a specific surface area of 2-20 m2/g.COPYRIGHT: (C)2010,JPO&INPIT【課題】十分な食品保存効果が得られ、食品の味質に与える影響が少なく、食品中での分散性が良好な食品用日持ち向上剤を提供する。【解決手段】平均粒子径が1~15μm、且つ比表面積が2~20m2/gである難水溶性ポリフェノール粉末を含有する食品用日持ち向上剤。【選択図】なし