Solvent extraction of dansyl-amino acid anions by dicationic extractants.
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概要
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The extraction of dansyl-amino acid anions from an alkaline aqueous medium was studied by the use of dicationic anion-exchange extractants, polymethylenebis(trioctylphosphonium)s (abbreviated as C<I><SUB>n</SUB></I>BPs; <I>n</I>=2–12). As for the extraction of dianionic species, such as dansyl-aspartic acid anion (Dns-Asp<SUP>2−</SUP>) and dansyl-glutamic acid anion (Dns-Glu<SUP>2−</SUP>), the dicationic extractants were greatly superior to a monocationic extractant, butyltrioctylphosphonium (BuMP). However, regarding the extraction of monoanionic species, such as dansyl-serine anion, dansyl-phenylalanine anion, and dansyl-valine anion, the extraction abilities of the dicationic extractants and the monocationic extractant were similar to one another. The extraction ability of dicationic extractants was remarkably dependent on the length of their bridge-chain, which connects the two ionic centers. For extractants having short bridge-chain (C<SUB>2</SUB>BP–C<SUB>4</SUB>BP), Dns-Asp<SUP>2−</SUP> was more extracted than Dns-Glu<SUP>2−</SUP>. On the contrary, for extractants with long bridge-chain (C<SUB>8</SUB>BP–C<SUB>12</SUB>BP) , Dns-Glu<SUP>2−</SUP> was more extracted than Dns-Asp<SUP>2−</SUP>. The solvent effect on the extraction of Dns-Asp<SUP>2−</SUP> and Dns-Glu<SUP>2−</SUP> was also studied.
- 公益社団法人 日本化学会の論文
著者
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Maeda Shigeru
Department Of Applied Chemistry And Chemical Engineering Faculty Of Engineering Kagoshima University
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Ohki Akira
Department Of Applied Chemistry And Chemical Engineering Faculty Of Engineering Kagoshima University
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Dohmitsu Hiroyuki
Department of Applied Chemistry, Faculty of Engineering, Kagoshima University
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Ohki Akira
Department of Applied Chemistry, Faculty of Engineering, Kagoshima University
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