Imparting functionality viz color, antioxidant and antibacterial properties to develop multifunctional wool with Tectona grandis leaves extract using reflectance spectroscopy

In recent years, considerable attention has been given to plant colorants for use in dyeing applications because of their newly discovered properties such as insect repellency, deodorizing, antioxidant, sun protection, and antibacterial activity. In view of their better biocompatibility, biodegradability, less-toxicity, natural colorants are gaining worldwide interest for producing elegant hues and highly functional value-added textiles. In the present work, we investigated the coloring and functional finishing of wool with Tectona grandis L. leaves extract with the emphasis on effect of metallic salt mordants on colorimetric potential, fastness, radical scavenging potential, and antibacterial activity in an attempt to develop bioactive fibres for use in health care applications. The pretreatment of wool with ferrous sulfate, potassium aluminium sulfate and stannous chloride provided a significant enhancement in CIELa*b* parameters and fastness properties. Antioxidant tests showed that the control dyed wool had excellent radical scavenging activity than mordanted samples. In addition, metal mordants particularly ferrous sulfate enhanced the durability of antibacterial efficacy to several laundering cycles. It can be concluded that the extract of Tectona grandis may be developed as multifunctional finishing agent to impart simultaneous color, antioxidant and antibacterial properties to wool based fabrics.