Selective uptake of copper(II) ions in water by chelating agent-impregnated liposomes.

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  • HIGUCHI Kazuyoshi
    Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University
  • SAITOH Tohru
    Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University
  • HIRAIDE Masataka
    Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University

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Other Title
  • キレート試薬含有リポソームを用いる水中の銅（ＩＩ）の選択的捕集
  • キレート シヤク ガンユウ リポソーム オ モチイル スイチュウ ノ ドウ II ノ センタクテキホシュウ

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Abstract

Unilamellar vesicles (i.e., liposomes) having 0.4 μm diameters were prepared by an extrusion technique. The liposomes were composed of phosphatidylcholine, phosphatidylglycerol, cholesterol, and chelating agents. When liposomes containing 8-hydroxyquinoline (HQ) were added to a water sample, copper (II) ions were collected with a recovery of 76±3%. The recovery, however, was decreased to 44 or 30% when the sample contained 1 or 5 μg/ml of humic acid, respectively. This was probably due to the exclusion of the copper-humin complex from the surface of liposome. A selective uptake of free copper (II) ion was not achieved by other chelating agents (e.g., 1,10-phenanthroline and N-benzoyl-N-phenylhydroxylamine). The inclusion of (N-ditiocarboxy) sarcosine in the inner water pool of the liposome significantly enhanced the copper uptake, while maintaining the selectivity.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 51 (9), 745-749, 2002

    The Japan Society for Analytical Chemistry

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