The influence of chitosan and some of its depolymerized grades on natural color printing



Chitosan samples with different molecular weights were prepared using sodium nitrite in acidic medium. These samples were practically confirmed by measuring nitrogen content and average molecular weight. The chitosan samples were applied to cotton fabric by the pad dry method. The pretreated cotton fabric was printed with natural coloring matter, curcumin. The color yield of the prints increased by increasing the molecular weight of chitosan. Both wet and dry rubbing fastness of the prints was good. The stiffness results of the printed cotton fabric pretreated with low molecular weight chitosan showed better performance. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 559–563, 2005