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Interaction of some antioxidants with Belousov-Zhabotinsky reaction based on catechol-BrO −3 -Mn2+-H2SO4 system

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Abstract

Temporal evolution of a new Mn(II) catalyzed Belousov-Zhabotinsky (BZ) chemical oscillator with catechol (1.2-dihydroxybenzene) as organic substrate is reported within narrow range of concentrations of initial reagents at 30°C. After optimizing the oscillation parameters the system was perturbed with the antioxidants like ascorbic acid and inosine. It is found that ascorbic acid acts as co-substrate within certain concentration limit, whereas inosine acts as a quencher of oscillations. Addition of ascorbic acid to the BZ system decreases induction time thus acting synergistically to help the reaction to enter quickly into the oscillatory regime. A good linear dependence of induction time on the concentration of ascorbic acid (R 2 = 0.9948) and inosine (R 2 = 0.955) is reported. Inosine has been found to increase the induction time and quench the oscillations. It is mentioned that the magnitude of induction time decreases to a greater extent with ascorbic acid as compared to the magnitude of its increase with the same concentration of inosine. This is pointing to the fact that ascorbic acid is stronger antioxidant than inosine as depicted by their interaction with catechol-based BZ chemical oscillator. Temporal evolution of the BZ reaction with the injection of antioxidants at different stages of reaction is also reported.

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Authors and Affiliations

  1. Department of Chemistry, University of Kashmir Srinagar, Srinagar, India

    I. A. Shah, G. M. Peerzada & N. Bashir

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  1. I. A. Shah
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  2. G. M. Peerzada
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  3. N. Bashir
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Correspondence to G. M. Peerzada.

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Shah, I.A., Peerzada, G.M. & Bashir, N. Interaction of some antioxidants with Belousov-Zhabotinsky reaction based on catechol-BrO −3 -Mn2+-H2SO4 system. Kinet Catal 54, 530–537 (2013). https://doi.org/10.1134/S0023158413050157

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  • DOI: https://doi.org/10.1134/S0023158413050157

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