Natural dyeing with anthocyanins from Hibiscus rosa sinensis flowers

Authors

  • Padma S. Vankar,

    Corresponding author
    1. Facility for Ecological and Analytical Testing, Indian Institute of Technology, Kanpur 208 016, India
    • Facility for Ecological and Analytical Testing, Indian Institute of Technology, Kanpur 208 016, India
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  • Dhara Shukla

    1. Facility for Ecological and Analytical Testing, Indian Institute of Technology, Kanpur 208 016, India
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Abstract

A new approach for natural dyeing with anthocyanin has been discussed along with a convenient method of extraction. Anthocyanin from Hibiscus flowers has been extracted by developing a method using methanolic solution of 4% citric acid. The new method gave better yield of anthocyanin as compared with methanolic solution of 0.1% hydrochloric acid. It has been also shown that pH of the extract plays an important role on the dye, thus by adjusting the pH of the extract at 4, dyeing of cotton and silk together with metal mordanting gave different colors. The best dyeing results were obtained for stannous mordanted fabrics in terms of fastness properties. The role of metal ion complexation of stannous salt with the dye extract has been confirmed through UV-Vis and FTIR spectra. Antioxidant activity of the anthocyanin extract seemed to have contributed to enhance the fastness properties of the dyed fabrics. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

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