Cyclic voltammetric, EQCM and impedance study of the 1-octanol-β-cyclodextrin-electrodeposited platinum system in perchloric medium

The interaction of estrone and estradiol with b-cyclodextrins (bCD) was investigated by differential pulse voltammetry (DPV) and high-performance liquid chromatography (HPLC) in mixed media. The co-solvent influence on the tendency of these estrogens to form inclusion complexes with bCD was examined. Thus, acetonitrile (MeCN) and ethanol (EtOH) were used in a mixed aqueous medium containing phosphate buffer. The association constant of the inclusion complexes (K a ) of estrone and estradiol with bCD were determined in two different media by using both voltammetric and chromatographic techniques. Estradiol was found to bind to bCD with higher affinities than estrone, irrespective of the medium. We have also found a clear influence of the co-solvent on the K a value, which means a competition of co-solvent molecules with estrogens for binding to the cavity of bCD. Consequently, interaction between bCD and the steroids is weakened when acetonitrile is used.

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“…The current titration equation has been described as follows [16][17][18][19] and has been deduced according to references 20-22…”

Section: Methodsmentioning

confidence: 99%

Inclusion complexes of estrone and estradiol with β‐cyclodextrin: Voltammetric and HPLC studies

Yáñez

Basualdo

Jara‐Ulloa

et al. 2007

J of Physical Organic Chem

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“…Characterization of the modified electrode was carried out under nitrogen atmosphere and at room temperature in a pH 11 (87.9 ml of 0.1 M Na 2 CO 3 + 12.1 ml of 0.1 M NaHCO 3 ) buffer electrolyte. The electrochemical equipment has been described [14,15]. A Pt helix was used as counter electrode.…”

Section: Reagents and Equipmentmentioning

confidence: 99%

Electropreparation and characterization of polyNiTSPc films. An EQCM study

Ureta-Zañartu

Alarcón

Berríos

et al. 2005

Journal of Electroanalytical Chemistry

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“…The electrochemical quartz crystal microbalance (EQCM) has been used to study the electrooxidation of alcohols on platinum [29,30]. Here, we have applied this technique, in conjunction with cyclic voltammetry, to the electrooxidation of methanol and ethylene glycol on Au and polynickeltetrasulphophthalocyanine-modified (polyNiTSPc/Au/Q) electrodes in a pH 11 carbonate-hydrogen carbonate buffer.…”

Section: Introductionmentioning

confidence: 99%

Electrooxidation of methanol and ethylene glycol on gold and on gold modified with an electrodeposited polyNiTSPc film

Ureta-Zañartu

Alarcón

Muñoz

et al. 2007

Electrochimica Acta

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Cyclic voltammetric, EQCM and impedance study of the 1-octanol-β-cyclodextrin-electrodeposited platinum system in perchloric medium

Cited by 8 publications

References 22 publications

Inclusion complexes of estrone and estradiol with β‐cyclodextrin: Voltammetric and HPLC studies

Inclusion complexes of estrone and estradiol with β‐cyclodextrin: Voltammetric and HPLC studies

Electropreparation and characterization of polyNiTSPc films. An EQCM study

Electrooxidation of methanol and ethylene glycol on gold and on gold modified with an electrodeposited polyNiTSPc film

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