Eco-friendly dyeing of cotton with brown natural dye extracted from Ficus amplissima Smith leaves

摘要

We have extracted anew brown-coloured natural dye from theleaves of Ficus amplissima Smith using Soxhlet extraction. The dye was assessed for the colour composition by qualitative phytochemical analysis, UV-visible and FTIR spectra, and tested for the dyeing of cotton. We usedalum, copper sulphate, iron sulphate and stannous chloride mordants using thepre-mordanting method. The dye was fixed on the mordanted cotton by the conventional dyeing methods and optimized dyeing conditions. Results showthe presence of alkaloids, glycosides, steroids, flavonoids, flavones, polyphenols, saponin, tannins, terpenoids and coumarins. Optimaldyeing conditions are 7 % over the weight of fabric dye concentration, 80 degrees C dyeing temperature, 120min dyeing time and 6.5 dye bath pH. The metal treatment ofthe cotton inducesbright brown to bluish-black shades with improved colour strength and fastness properties. Overall, this new dye is eco-friendly, non-polluting, healthy and alternative to synthetic brown dyes for cotton.