PROBLEM TO BE SOLVED: To provide a high-concentration sodium acetate-containing brewed vinegar in which the astringent taste of sodium acetate is suppressed, and a shelf life improver for rice and rice using the high-concentration sodium acetate-containing brewed vinegar, particularly rice and rice, which can be distributed at room temperature. The purpose is to provide a kind of method for improving shelf life. SOLUTION: This is a high-concentration sodium acetate-containing vinegar obtained by partially neutralizing acetic acid contained in high-acidity brewed vinegar with an inorganic sodium salt, and the ratio of acetic acid / sodium acetate is 0.15 to 0.21. It is solved by a high-concentration sodium acetate-containing brewed vinegar, a food-use shelf life improving agent using the high-concentration sodium acetate-containing brewed vinegar, and a food shelf life improving method, which are characterized by being within the above range. [Selection diagram] None【課題】酢酸ナトリウムのエグ味が抑制された高濃度酢酸ナトリウム含有醸造酢及び該高濃度酢酸ナトリウム含有醸造酢を用いた食品用、特に常温流通に対応可能な米飯類用日持向上剤並びに米飯類の日持向上方法を提供することを目的とする。【解決手段】高酸度醸造酢に含まれる酢酸を無機のナトリウム塩で部分中和してなる、高濃度酢酸ナトリウム含有醸造酢であって、酢酸／酢酸ナトリウムの比率が０．１５～０．２１の範囲内であることを特徴とする、高濃度酢酸ナトリウム含有醸造酢及び該高濃度酢酸ナトリウム含有醸造酢を用いた食品用日持向上剤並びに食品の日持向上方法により解決する。【選択図】なし
