天然染料の染着機構に関する研究(第3報) : 食品中の天然色素による染色とその堅牢度

概要

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This study was performed to obtain the basic data for the practical application of natural pigments in foods as the safest dyes for silk and cotton. The adsorption isotherm and the rate of adsorption on silk at first stage of rubrobracin(one of the anthocyan pigment) which is contained in the red cabbage were measured. From results of these measurements which had no temperature dependence, it is estimated that the rubrobracin molecule is adsorbed by the hydrogen bond in the amorphous region of the silk fiber. Rubrobracin and the extracted pigments from the red radish were dyed on the silk and cotton. For the practical application of these pigments, improvements of washing and light fastness were examined by using natural substances and mordanting by Al^<3+> or Sn<4+>. From these results obtained, the addition of tannic acid in the dyeing bath with the aftermordanting by Al^<3+> or Sn^<4+> gave good improvements of the washing fastness. And also, the addition of natural organic acid such as citric acid or carminic acid in the dyeing bath with the aftermordanting by Al^<3+> or Sn^<4+>gave 2-4 times improvements of light fastness.
社団法人日本家政学会の論文
1990-05-05