Abstract
Electrochemical oxidation of hematoxylin has been studied using cyclic voltammetry, differential pulse voltammetry, chronocoulometry and controlled potential coulometry. It indicates that not only electrochemical behavior of hematoxylin depends on the pH, but also its behavior depends on the concentration. The adsorption activity of hematoxylin and its oxidation products on the surface of the glassy carbon electrode was found to vary in the order hematox > hematein > hematoxylin. In addition, it is found that adsorption of hematoxylin depends on the pH and increases with decreasing pH. It is also found that at pHs lower than pK a1, the adsorption of hematoxylin on the surface of the glassy carbon electrode is high. Furthermore, the orientation of adsorbed hematoxylin on the surface of glassy carbon electrode was estimated. The results show that the orientation of adsorbed hematoxylin molecules at glassy carbon surface is endwise.
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The authors acknowledge the Bu-Ali Sina University Research Council and Center of Excellence in Development of Environmentally Friendly Methods for Chemical Synthesis (CEDEFMCS) for their support of this work
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Beiginejad, H., Nematollahi, D., Noroozi, M. et al. Electrochemical oxidation and adsorption of hematoxylin at glassy carbon electrode in various pH values. J IRAN CHEM SOC 12, 325–333 (2015). https://doi.org/10.1007/s13738-014-0487-6
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DOI: https://doi.org/10.1007/s13738-014-0487-6