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Dyeing of Silk Fabric with Aqueous Extract of Cassia tora L. Seed

  • Textile Coloration and Finishing
  • Abbr : Text. Color. and Finish.
  • 2005, 17(2), pp.10-18
  • Publisher : The Korean Society Of Dyers And Finishers
  • Research Area : Engineering > Fiber Engineering > Dyeing Engineering

DHO SEONG KOOK 1 강인아 1

1동아대학교

Accredited

ABSTRACT

fabrics mordanted with Fe2+, Ni2+, and Cu2+ were dyed with the aqueous extract of Cassia tora L. seed which was known to include water soluble colorant kaempferol, one of flavonol compounds. Kaempferol can react with free radicals and chelate transition metal ions, which is thought to catalyze processes leading to the appearance of free radicals and have antioxidant activity. In relation to the coordinating and chelating mechanism of the ions with the silk protein and kaempferol, reasonable conclusions should be made on the colorant uptake and the water fastness of the fabric. The amount of the colorant on the fabric was in the order of Fe2+>Ni2+>Cu2+. In case of dyeing through coordinaiton bonds between transition metal ions and silk protein and colorants, it was thought that the ions with the smaller secondary hydration shell, the higher preference to the atoms of the ligand coordinated, and the suitable bonding stability for the substitution of primarily hydrated water molecules for colorants led to the higher colorant uptake.The water fastnsess of the fabric was in the order of Fe2+>Cu2+>Ni2+. It should be reasonable to choose transition metal ions with weak and strong tendency to the ionic and the coordination bond, respectively, to the carboxylate anion of the silk protein.Although further research needs to be done, the conclusions above may be generally applied to the natural dyeing through the coordination bond mechanism between transition metal ions and colorants and substrates.

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