β-Cyclodextrin electropolymerization: mechanism, electrochemical behavior, and optimization
- 4 Downloads
The main purpose of this manuscript was to study the electropolymerization using cyclodextrin as a monomer for application as electrochemical sensors. This process was first studied by Morales et al. and will be discussed in this work using a systematic and descriptive approach. For that, the voltammetric behavior of a β-cyclodextrin electropolymerization on a carbon glassy electrode (CGE) surface and the mechanism involved was investigated. The electropolymerization exhibits two anode peaks at 0.61 V and 1.56 and two cathode peaks at − 0.58 V and − 1.05 that increases in successive cycles, indicating that a β-CD polymer film is being formed. The mechanism of β-CD electropolymerization occurs in two stages simultaneously: the monomer is deposited on the surface of the CGE by covalent bonds, while the monomer is coupled successively producing the polymer. The followed experimental conditions were optimized evaluating the voltammetric responses observed during the polymer formation: potential range (− 1.3 to 0.9 V), presence or absence of dissolved oxygen (presence) and stirring during the electropolymerization (with agitation), electrolyte pH (pH = 5.0), scan rate (100 mV s−1), and concentration of β-CD (6 mol L−1). The optimization promoted the development of a more efficiently synthesis.
KeywordsElectropolymerization β-Cyclodextrin Mechanism Electrochemical behavior
We thank FAPEMIG, CAPES, CNPQ, and Rede Mineira de Química for the continuous support of our research.
- Alarcón-Ángeles G, Guix M, Silva WC, Ramírez-Silva MT, Palomar-Padavé M, Romero-Romo M, Merkoçi A (2010) Enzyme entrapment by β-cyclodextrin electropolymerization onto a carbon nanotubes-modified screen-printed electrode. Biosens Bioeletron 26:1768–1773. https://doi.org/10.1016/j.bios.2010.08.058 CrossRefGoogle Scholar
- Aleixo LM (2003) Voltametria: conceitos e Técnicas. ChemKeys 1:1–40Google Scholar
- Bruice PY (2006) Química Orgânica, vol 2. Pearson, New YorkGoogle Scholar
- Clayden J, Greeves N, Warren S (2012) Organic chemistry. Oxford University, OxfordGoogle Scholar
- Golabi S, Mirzazadeh J (2003) Electrocatalytic oxidation of hydrazine at epinephrine modified glassy carbon electrode. Chem Eng 22:1–14Google Scholar
- Hernandez-Jiménez A, Roa-Morales G, Oeyes-Pérez H, Balderas-Hernández P, Barrera-Díaz BM (2016) Voltammetric determination of metronidazole using a sensor based on electropolymerization of a-cyclodextrin over a carbon paste electrode. Electroanalysis 28:704–710. https://doi.org/10.1002/elan.201500452 CrossRefGoogle Scholar
- Páramo-García U, Ibanez JG, Batina N (2011) Electrochemical modulation of the thickness of polypyrrole films by using different anionic dopants. Int J Electrochem Sci 6:5172–5188Google Scholar
- Qin Q, Bai X, Hua Z (2016) Electropolymerization of a conductive β-cyclodextrin polymer on reduced graphene oxide modified screen-printed electrode for simultaneous determination of ascorbic acid, dopamine and uric acid. J Electroanal Chem 782:50–58. https://doi.org/10.1016/j.jelechem.2016.10.004 CrossRefGoogle Scholar