n-アルキルオリゴ(オキシエチレン)エーテルと脂肪酸類から構成される協同担体によるアルカリ金属イオン及びアルカリ土類金属イオンの受動輸送

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Homogeneous oligo(oxyethylene)n-dodecyl ethers(C12Em, m=28)and higher alkanoic acids(C8C18)were examined as carriers for the competitive passive transport of alkali(Li+, Na+, and K+)and alkaline earth metal(Mg2+, Ca2+, and Ba2+)cations through a chloroform membrane. 1) The linear polyethers, combined with an alkanoic acid, effectively mediated cation-transport similarly to cooperative carriers composed of crown ether and alkanoic acid as reported previouslyl4)16). 2) 2-Bromoalkanoic acids (BAA) were superior to those unsubstituted as co-carriers in both transport efficiency and cation-selectivity for two competitive systems (Table-1 and -2). 3) For a monovalent cations system, the polyethers combined with BAA (C12Em-BAA) had essentially the same selectivity (K+>Na+>>Li+). Their transport efficiency increased with m (Fig.-3). 4) The selectivity of divalent cations except Mg2+ was found to depended on m of C12Em-BAA, and plots of efficiency vs. m for Ca2+ and Ba2+ gave maxima at m=5 and m=6, respectively (Fig.-5). 5) The effect of the acyl chain length of BAA on the transport ability of these cooperative carriers was also examined (Fig.-4 and -6).
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