It makes the marine products thing extract original flavor to which be able to decrease removal or the content, furthermore not yet treatment ones have the iodine which is included in the marine products thing extract and to be able to maintain the taste and appearance etc. The anode (3) from side the 1st anion exchange film (5) and the 2nd anion exchange film (6) it lays out in sequence, both anion exchange film (5.6) the extract storage chamber (9) forms between and the marine products thing extract (21) stores. The 1st anion exchange film (5) the iodic recovery chamber (8) it forms on anode side. The 2nd anion exchange film (6) the replenisher storage chamber (10) forming on cathode side, the replenisher which contains the chlorine ion (24) it stores. Due to electric dialysis, the marine products thing extract (21) the iodic recovery chamber (8) to making pass the 1st anion exchange film (5), it makes the iodic ion move which is included, the replenisher (24) the extract storage chamber (9) making pass the 2nd anion exchange film (6) to inside, it adds the chlorine ion which is included.海産物エキスに含まれるヨウ素を除去若しくはその含有量を低減でき、しかも未処理物が備える海産物エキス本来の風味や呈味、外観などを維持できるようにする。陽極(3)側から順に第1陰イオン交換膜(5)と第2陰イオン交換膜(6)とを配置し、両陰イオン交換膜(5・6)間にエキス収容室(9)を形成して海産物エキス(21)を収容する。第1陰イオン交換膜(5)の陽極側にヨウ素回収室(8)を形成する。第2陰イオン交換膜(6)の陰極側に補充液収容室(10)を形成して、塩素イオンを含有する補充液(24)を収容する。電気透析により、海産物エキス(21)に含まれるヨウ素イオンをヨウ素回収室(8)へ第1陰イオン交換膜(5)を通過させて移動させ、補充液(24)に含まれる塩素イオンをエキス収容室(9)内へ第2陰イオン交換膜(6)を通過させて補充する。
