Chemical properties of shikonin from the view point of dyeing.

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  • シコニンの染色化学的性質
  • シコニン ノ センショク カガクテキ セイシツ

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Shikonin was extracted from the dried roots of Lithospermum erythrohizon on the market with hot water and purified by recrystallization from benzene. The dissociation constants of two hydroxyl groups in the pigment molecule were estimated by the results of visible absorption spectra of aqueous solutions of shikonin at various pH's. The effects of an addition of aluminum ion on the visible absorption spectra of shikonin in a methanol solution were examined. An aluminum-premordanted silk fibroin film was dyed with shikonin and the visible absorption spectra of the dyed film was examined. By the results, it was concluded that both 5- and 8-hydroxyl groups in the pigment may form aluminum chelates with the neighboring carbonyl groups in the methanol solution and on the silk fibroin film, respectively. Aluminum- or tin (II)-premordanted silk fabrics were dyed with sikonin from water-ethanol solution (1:4, V/V). The surface colors of the dyed fabrics were shown on the a* b* diagram of the L* a* b* colorimetric system.

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