Assessment of colorimetric, antibacterial and antifungal properties of woollen yarn dyed with the extract of the leaves of henna (Lawsonia inermis)

The extract of leaves of henna was applied on woollen yarn to investigate the dyeing characteristics and antimicrobial efficacy against common human pathogens such as Escherichia coli MTCC 443, Staphylococcus aureus MTCC 902 and Candida albicans ATCC 90028. Bioactivity of henna dyed woollen yarn was compared with commercial antibacterial (Ampicillin) and antifungal (Fluconazole) agents. Lawsonia inermis dyed woollen yarn samples were found considerably active against tested microorganisms. Dyed wool yarns were tested for fastness toward light, washing and crocking (dry and wet). Fastness properties of dyed woollen yarn samples were found considerably good. Effect of eco-friendly metallic salt mordants on bioactivity and color characteristics of dyed woollen yarn samples were also investigated. The results proved that mordanted wool yarn showed increase in dye uptake resulting in high color strength and better fastness properties but considerable decrease in antimicrobial activity and slight decrease in the case of antifungal activity were observed with the application of mordants. The results indicate that extract of leaves of henna can be applied on woollen yarns to produce colored clothings and textiles (sportswear, clothings for hospitals and babies) with semidurable antimicrobial properties. (C) 2012 Elsevier Ltd. All rights reserved.