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• W2994501699 startingPage "120610" @default.
• W2994501699 abstract "In this work we propose the voltammetric analysis of contraceptive hormones ethinylestradiol (EE) and cyproterone acetate (CPA) using solid amalgam electrode fabricated with silver nanoparticles. To the best of our knowledge, this is the first report describing the simultaneous determination of these two compounds and also the first report of the use of amalgam electrode for analysis of EE and CPA. The voltammetric behavior of both substances was investigated by their reduction. An irreversible electrochemical process involving two protons and two electrons was found for each compound. The analytical assays were carried out using staircase voltammetry (SCV). Due to this, aiming to improve the analytical sensitivity, the cationic surfactant cetyltrimethylammonium bromide was also used. The instrumental and experimental parameters were studied and optimized to achieve the best conditions for the analysis. Under the optimum conditions, the voltammetric signals of EE and CPA showed dependence on the concentration range from 6.4 × 10−7 to 7.8 × 10−6 mol L−1 and from 1.0 × 10−6 to 1.0 × 10−5 mol L−1, respectively. The limits of detection obtained were 1.03 × 10−7 mol L−1 for EE and 2.99 × 10−7 mol L−1 for CPA. The analytical usefulness of the method was evaluated through its application on the simultaneous determination of EE and CPA in pharmaceutical formulations and urine samples. The two analytes were successfully quantified in these samples with good precision and the values found presented satisfactory concordance with the reference values, suggesting acceptable analytical efficiency for the approach described here." @default.
• W2994501699 created "2019-12-13" @default.
• W2994501699 creator A5034398652 @default.
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• W2994501699 date "2020-04-01" @default.
• W2994501699 modified "2023-09-25" @default.
• W2994501699 title "Electrochemical study and simultaneous voltammetric determination of contraceptives ethinylestradiol and cyproterone acetate using silver nanoparticles solid amalgam electrode and cationic surfactant" @default.
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• W2994501699 doi "https://doi.org/10.1016/j.talanta.2019.120610" @default.
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