Journal
ELECTROCHIMICA ACTA
Volume 56, Issue 27, Pages 10231-10237Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2011.09.021
Keywords
Square wave voltammetry; Electrochemistry nanostructures; Partition constant; Vesicles
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Funding
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
- Universidad Nacional de Rio Cuarto
- Agencia Nacional de Promocion Cientifica y Tecnica
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1-Naphthol (NPh) behavior in water and in large unilamellar vesicles (LUVs) formed with the phospholipid 1,2-di-oleoyl-sn-glycero-3-phosphatidylcholine (DOPC) was studied by square wave (SWV) and cyclic voltammetry (CV) techniques and, compared with emission spectroscopy studies. In DOPC LUV media, the redox behavior of NPh shows that the molecule undergoes a partition process between two pseudophases, the water and the LUV bilayer. The NPh electrochemical responses allow us to propose a model to explain the electrochemical experimental results and, in conjunction with our measurements, to calculate the NPh partition constant (K) value between the pseudophases. The K value coincides with the one obtained through emission spectroscopy. Beside the K value, our electrochemical model allows us to calculate the diffusion coefficient (D-LUV) for DOPC LUV which coincides with the D-LUV value obtained through dynamic light scattering (DLS). Thus, our data clearly show that the electrochemical measurements could be a powerful alternative approach to investigate the behavior of non-ionic electroactive molecules embed in a confined environment such as the LUV bilayer. (C) 2011 Elsevier Ltd. All rights reserved.
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