A convenient and rapid detection method of Kaimurasaki coloring matter by MS.

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  • KOSUGI Yoshio
    Department of Applied Chemistry, School of Engineering, Nagoya University
  • MATSUMOTO Kozo
    Department of Applied Chemistry, School of Engineering, Nagoya University

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Other Title
  • 質量分析法による貝紫色素の簡便，迅速な判別法
  • シツリョウ ブンセキホウ ニ ヨル カイ ムラサキシキソ ノ カンベン ジンソク ナ

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Abstract

Mass spectrometry has been applied to the analysis of Kaimurasaki (Tyrian purple), a coloring material of archaeological importance. Kaimurasaki coloring matter was obtained from the hypobrachial glands of Akanishi-gai (Rapana venosa Valencinnes) and mixed with 5% salt water at 5°C. The salt water-based sample was directly introduced to the electron ionization source and was heated rapidly. The resulting total ionization current was monitored while adjusting the ionization current from 70 eV to 15 eV. Mass spectra thus obtained at ca. 250°C gave parent peaks of dibromoindigotin (m/z 418, 420, 422), fragment ions of the precursor, 6-bromo-2-methylthioindoleninone and another dibromo compound of ions m/z 404, 406, 408. The solid coloring matter after removal from salt water and washing with pure water was analyzed well, too. This method was found to be applicable to the detection of the coloring matter in dyed cloth.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 43 (12), 1133-1136, 1994

    The Japan Society for Analytical Chemistry

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