メダカおよびニジマス卵膜の陽イオン交換体としての性質

概要

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Some properties as an ion exchanger of the chorions isolated from eggs of medaka Oryzias latipes and rainbow trout Salmo gairdneri were studied by using five metal ions (Ca2+, Cd2+, Mg2+, Mn2+, and Zn2+). The binding of these metal ions to the medaka chorion was observed in the pH region from 5 to alkaline sides. On the other hand, the binding of Ca2+, Mg2+ and Mn2+ to rainbow trout chorion was detected in the pH region above 6, and that of Cd2+ and Zn2+ from 5 to alkaline sides. Amounts of metal ions bound to both chorions increased with increasing pH. When both metal-binding chorions were transferred into other metal ion solutions, an ion exchange reaction between the metals bound to the chorions and the other ions in solutions took place immediately. Cd2+ and Zn2+ had a high binding affinity to both chorions, followed by Mn2+, Mg2+ and Ca2+. The binding affinity of Mg2+ was equal to that of Ca2+. It is thus evident that both chorions of medaka and rainbow trout eggs possess some properties of the cation exchanger which have an ion exchange group of weak acid such as -(binding site)-H+.
日本水産學會の論文