UV protection and antibacterial treatment of cellulosic fibre (cotton) using chitosan and onion skin dye.

Interest in environment-friendly textile processing techniques has been augmenting in recent years. Natural dyes are environment friendly, low toxic and less allergenic owing to the existence of large number of structurally diverse active compounds which makes natural colourants promising options for the development of antimicrobial and ultra-violet (UV) protective textiles. The purpose of the present study was to investigate the effect of biopolymer and dyeing treatment with natural dye on the functional properties (antibacterial and UV protection) of cotton fabric and the assessment was done using standard test method. It was found that the chitosan treated onion skin dyed cotton fabric showed 97.20 percent and 98.03 % reduction in the growth of E. coli and S. aureus bacteria respectively. The chitosan treated dyed cotton fabric showed the higher ultra-violet protection factor (UPF) value (84.80) as compared to alum treated dyed cotton fabric (66.70) depicting that the chitosan treated dyed cotton fabric provided more ultraviolet protection than the alum treated dyed fabric.