PROBLEM TO BE SOLVED: To solve problems that most of conventional freshness keeping methods for keeping freshness of fresh food require contacting to food products directly, therefore there is difficulty in the food hygiene, and, though there is a method for keeping freshness by negative ions generated from a ceramic or the like without directly contacting to the food, the method has difficulty in that the method is not sufficient in suppression of putrefactive bacteria, and therefore a freshness keeping material exhibiting an oxidation degradation prevention effect and a putrefactive bacteria repellent effect without directly contacting to food and a production method of the same are required.SOLUTION: Resonant electromagnetic wave having a specific frequency is radiated to a material such as paper, cloth, plastic, metal or ceramic for certain period under a specific temperature condition, thereby the material itself becomes a transfer body of the electromagnetic wave. A chip 63, a seal or a sheet of the transfer body is attached to the outside of a container 61 storing fresh food, and the material serves as an oscillation source of the electromagnetic wave. Thereby, without directly contacting to food, the freshness holding material can exhibit the oxidation degradation prevention effect and the putrefactive bacteria 70 repellent effect.COPYRIGHT: (C)2015,JPO&INPIT【課題】従来の生鮮食品の鮮度を保持する方法は、ほとんどが食品に直接接触するため食品衛生上の問題があった。またセラミック等の発生するマイナスイオンで食品に直接接触せずに鮮度保持する方法も開発されているが、腐敗菌の抑制に問題があった。そこで、直接食品に接触することなく酸化劣化防止効果と腐敗菌忌避効果を発揮する鮮度保持材とその製造方法を提供する。【解決手段】紙や布やプラスチックや金属やセラミックの材料に、特定の周波数の共鳴電磁波を、特定の温度条件下で、一定時間照射することにより、当該材料自体を、当該電磁波の転写体とし、当該転写体のチップ63やシールやシートを、生鮮食品の入った容器61の外側に取り付け、当該材料を当該電磁波の発振源とすることにより、直接食品に接触することなく酸化劣化防止と腐敗菌70忌避効果を発揮する鮮度保持材とその製造方法。【選択図】図4
