Reapplix ApS.

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Bleaching of organic cotton fabric can be done with hydrogen peroxide in which Catalase, a non-toxic, environmentally friendly biocatalyst is used to remove the residual H 2 O 2 in a cost effective way for the better improvement of the cellulosic fabric properties. Enzyme treated organic cotton fabric was dyed with a natural dye obtained from orange corolla tube of Nyctanthes arbor-tristis flower with the use of ultrasonic power (38.5 kHz and 500W) and Conventional heating conditions. Ultrasonic power dyed fabric was compared with conventional dyeing by studying their dyeability. Optical density measurements were done for both dyed organic cotton samples. The ultrasound assisted dyeing process gave better dye absorption and fastness properties than that of conventional method using mordants.

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Modification of the fabric is one of the best routes to improve the affinity between dye and fabric. In this study, chemical modification of organic cotton fabric has been done by the greener way with the use of β-cyclodextrin and chitosan and the modification level were measured by dyeing with natural dye (Nyctanthes arbor-tristis) parijataka. Results of dyeing showed better dye uptake after modification on organic cotton fabrics, especially in chitosan modification. SEM and FTIR studies reveals about the surface modification and the presence of β-cyclodextrin and chitosan moiety on the modified fabric. CCM studies of modified and unmodified fabric reported that chroma (C*) values were found to be higher with modified fabric than unmodified fabric. Since the dyeability and other fastness properties of organic cotton are having better results. From an ecological point of view, organic cotton may be a better alternative to conventional cotton.

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