Greener Journal of Physical Sciences

Open Access

Bichi et al

Greener Journal of  Physical Sciences Vol. 3 (1), pp. 001-005, January, 2013.

ISSN: 2276-7851 © 2011 Greener Journals

Research Paper

Manuscript Number: 110512222


Molecular Structural Difference of the Irradiated and Control Samples of Indigo Dye Solution


T. S.Bichi1*, P. O. Akusu2 and Abdullahi M3


1Department of Physics, Kano University of Science and Technology, Wudil

2Department of Physics, Ahmadu Bello University, Zaria

3Department of Chemistry, Federal University Dutse, Jigawa State


*1Corresponding author: tsbichiosh@ yahoo. com


Irradiated/ decolourized and control samples of natural indigo dye solution are subjected to ion mass spectrometric analysis to get the mass spectra of the respective dye samples. The main ion (M+H) at 263 which symbolizes the molar mass of indigo dye (262.7g/mol) appeared predominantly on the mass spectrum of the control as well as that of the irradiated dye samples indicating that there is no mass difference between the dye molecules of the two samples. However, the mass spectra of the two dye samples agree in 11 fragments including the one at 263 (45%) and disagree in 13 fragments (55%). This disagreement translates into decolourization of the dye due to irradiation leading to the destruction of hydrogen bond and two other colour-bearing chromophores in the dye molecules. Indigo dye degradation mechanism had also been suggested in this work.
Key Words: Irradiation, Chromophores, Functional group, Radicals

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