European Journal of Chemistry 2012, 3(1), 112-118. doi:10.5155/eurjchem.3.1.112-118.532

Oxidative decolorization of carmosine with acidic chloramine-T: Spectrophotometric, kinetic and mechanistic chemistry


Jayachamarajapura Pranesh Shubha (1,*) , Puttaswamy Puttaswamy (2)

(1) Department of Chemistry, Don Bosco Institute of Technology, Kumbalagodu, Bangalore, 560060, India
(2) Department of Chemistry, Bangalore University, Central College Campus, Bangalore, 560001, India
(*) Corresponding Author

Received: 23 Sep 2011, Accepted: 21 Nov 2011, Published: 31 Mar 2012

Abstract


Carmosine is mainly used as a colorant in food industries. The oxidative decolorization of this dye is of greater significance and understanding of its kinetic and mechanistic aspects in redox reactions is important. Chloramine-T bears diverse chemical properties and has been exploited as oxidant for a variety of substrates. It is commercially available, inexpensive, non toxic, water tolerant and easy to handle. A systematic kinetic study of the oxidation of carmosine with acidic chloramine-T (CAT: TsNClNa here Ts = CH3C6H4SO2-) has been carried out in order to explore the mechanistic aspects of this redox system. UV-Visible spectrophotometry is used to monitor the reaction. Optimum conditions for the oxidative decolorization of carmosine with CAT were established. The kinetic results revealed that the reaction rate exhibits a first-order dependence each on [CAT]o and [carmosine]o and less than unit order dependence on [H+]. The reaction rate was examined for the effects of (a) p-toluenesulfonamide, (b) halide ions, (c) ionic strength, (d) dielectric permittivity and (e) solvent isotope. The reaction was studied at different temperatures and the activation parameters have been deduced. Oxidation products were characterized. Test for free radicals was found to be negative. The derived rate law based on the proposed mechanism is in complete agreement with the observed kinetic data.

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Keywords


Azo dye; Carmosine; Acid medium; Chloramine-T; Decolorization; Oxidation-kinetics

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DOI: 10.5155/eurjchem.3.1.112-118.532

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How to cite


Shubha, J.; Puttaswamy, P. Eur. J. Chem. 2012, 3(1), 112-118. doi:10.5155/eurjchem.3.1.112-118.532
Shubha, J.; Puttaswamy, P. Oxidative decolorization of carmosine with acidic chloramine-T: Spectrophotometric, kinetic and mechanistic chemistry. Eur. J. Chem. 2012, 3(1), 112-118. doi:10.5155/eurjchem.3.1.112-118.532
Shubha, J., & Puttaswamy, P. (2012). Oxidative decolorization of carmosine with acidic chloramine-T: Spectrophotometric, kinetic and mechanistic chemistry. European Journal of Chemistry, 3(1), 112-118. doi:10.5155/eurjchem.3.1.112-118.532
Shubha, Jayachamarajapura, & Puttaswamy Puttaswamy. "Oxidative decolorization of carmosine with acidic chloramine-T: Spectrophotometric, kinetic and mechanistic chemistry." European Journal of Chemistry [Online], 3.1 (2012): 112-118. Web. 21 Sep. 2019
Shubha, Jayachamarajapura, AND Puttaswamy, Puttaswamy. "Oxidative decolorization of carmosine with acidic chloramine-T: Spectrophotometric, kinetic and mechanistic chemistry" European Journal of Chemistry [Online], Volume 3 Number 1 (31 March 2012)

DOI Link: https://doi.org/10.5155/eurjchem.3.1.112-118.532

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