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Sankar Roy Maulik,Lina Chakraborty,Pintu Pandit 한국섬유공학회 2021 Fibers and polymers Vol.22 No.3
Aqueous extract of Eucalyptus globulus L. bark is used for simultaneous dyeing and finishing of cotton, silk, wool,and eri silk fabrics in the absence of inorganic salts or mordants for producing value-added environment-friendly products. All the fabrics have an affinity towards the colorants obtained from this bark. The phytochemical studies reveal the presenceof bioactive compounds, i.e. saponin, phenols, tannin, flavonoids, terpenoids, and glycosides in the bark. The protein fabricsdyed with this extract exhibit improved color fastness to washing and light as compared to cotton. A positive value of both a*and b*indicates the color of all the fabrics dyed with this bark is reddish-yellow. K/S values of all the dyed fabrics areimproved with the increase in dye bath concentration from 100 g/l to 200 g/l for all the fabrics dyed with these colorants. Thecalculated average particle size and zeta potential value of the aqueous extract is ~535 nm and -22.4 mV, respectively. All thedyed fabrics show an excellent result in terms of resistance against S. aureus and E. coli at 200 g/l dye concentration. Eucalyptus bark at 200 g/l dye bath concentration results in maximum UPF value for cotton, eri silk, and wool fabrics.