Extraction of natural colourants from roots of <i>Morinda angustifolia </i>Roxb.—Their identification and studies of dyeing characteristics on wool

Abstract

The colour components in the roots of the plant <i>Morinda angustifolia </i>Roxb. were isolated and their structures were elucidated based on chemical and spectroscopic investigations. Further, the dyeing behaviour or the colour component on wool in aqueous medium was also evaluated. Depending on concentrations of dye (1-5%) in the dye bath, the dye absorption on the fibre varied from 12.50-31.58%. The fastness properties of the dyed yarns were determined. Optical densities (OD) and colour strength (<i>K/S</i>)<i> </i>values of the dye solutions as well as the dyed yarns and also colour co-ordinates for dyed yarns were determined.