The yeast containing the copper, were suspended in a solution containing at least one of carboxylic acid and carboxylic acid salt, to include an extraction step for separating the solid component of the resulting suspension and the liquid component process for producing a copper-rich yeast extract according to claim, and copper-rich yeast extract, and a green holding restoring agent for food, and vegetables.銅を含有する酵母を、カルボン酸及びカルボン酸塩の少なくともいずれかを含む溶液に懸濁させ、得られた懸濁液の固体成分と液体成分とを分離する抽出工程を含むことを特徴とする銅高含有酵母抽出物の製造方法、及び銅高含有酵母抽出物、並びに、食品、及び野菜の緑色保持復元剤である。
