Optimization of Dye Extraction from Madder by Response Surface Methodology and Study of Dyeing Properties

In this study, the response surface method (RSM) of the central composite design model was used to optimize the extraction of dyes in madder plant root by a shaker-incubator. The optimum conditions for the assessed parameters including pH, time and temperature was 6.57, 63.88 min and 47.46 °C, respectively. Each experiment’s response was determined by assessing light absorption intensity at 413 nm. Experiments to obtain optimum condition out of the chosen model show that there is a very insignificant difference between the model’s absorption and our experimental method. To prepare powder of the extracted dye material, we extracted the dye through four steps. The resulted solution was condensed by a rotary machine in vacuity. Then it was added to a formulation that encompasses filling materials and superficial active materials agents. The results imply that the prepared powder can dye wool thread which in turn showed stable properties involved wash fastness of 4-5, light fastness of 4-5 and rubbing fastness of 3-5.