Table of Contents
Journal of Applied Chemistry
Volume 2014, Article ID 457254, 7 pages
Research Article

Visual Detection and Determination of Melamine Using Synthetic Dyes

Department of Studies and Research in Chemistry and Prof. C. N. R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572 103, India

Received 7 August 2014; Accepted 7 September 2014; Published 25 September 2014

Academic Editor: Hongxing Dai

Copyright © 2014 Ramesh Thimmasandra Narayan and Kirana Devarahosahally Veeranna. 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.


We have used spectroscopic technique for the detection of melamine. The effect of melamine on the colour as well as the pH of bromophenol, methyl red and alizarin red dye solutions was examined at different mole ratios. It is found that we observe color transition and the absorption maxima for bromophenol were at 598 nm, while for methyl red, and alizarin red-S dye they are at 520 nm and 423 nm, respectively. We observe an increase in the absorption intensities at 598 nm with increase in the concentration of melamine in bromophenol blue dye. The absorption intensities at 520 nm decreases and new peak at 420 nm emerges in methyl red dye-melamine mixture. While the absorption intensities at 420 nm decreases and 520 nm peak emerges in alizarin red S dye-melamine at higher mole ratios. The results indicate that we can choose the appropriate dye of suitable range to detect the concentration of melamine from 3 to 206 mg dm−3. The results demonstrate possible use of the simple method for the qualitative and quantitative detection of melamine in adulterated food samples.