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Journal of Chemistry
Volume 2013, Article ID 685679, 6 pages
Research Article

Interaction of Natural Dye (Allium cepa) with Ionic Surfactants

Department of Chemistry, Harcourt Butler Technological Institute, Nawabganj, Kanpur 208002, India

Received 23 June 2012; Accepted 15 August 2012

Academic Editor: Joël Fleurence

Copyright © 2013 Shalini Chandravanshi and Santosh K. Upadhyay. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Allium cepa is a natural dye that has been extracted from onion skin with the help of soxhlet apparatus. The pigment in the dye pelargonidin was found to be 2.25%. The interaction of the dye with ionic surfactants, namely, cationic surfactant (cetyltrimethylammonium bromide) and anionic (sodium lauryl sulphate) has been studied by spectrophotometrically, conductivity, and surface tension measurements. The thermodynamic and surface parameters have been evaluated for the interaction process. The results indicate complex formation and domination of adsorption in comparison to micellization.