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• W2100075347 abstract "The electroreduction of tipredane has been investigated by direct current and differential pulse polarography and by cyclic voltammetry at a hanging mercury drop electrode. In Britton-Robinson (B-R) buffer, pH 2.0–5.0, the drug is reduced in a single well-defined step: this reduction process has been shown to involve a preceding protonation step. At pH 12 also there is only a single step, this time involving reduction of the unprotonated species followed by a chemical step involving dimerisation. At intermediate pH values both peaks are present, peak 1 being at a less negative potential; studies of the mechanisms here are complicated by adsorption processes. Tipredane can be determined by differential pulse polarography at a pH of 7.0 or pH 2.0 using the first reduction peak over the concentration range 1.0 × 10−5 to 8.0 × 10−5 M or 1.0 × 10−6 to 8.0 × 1010−5 M, respectively. In B-R buffer at pH 4.5 two cathodic stripping peaks are obtained. The first peak, not present in the polarograms, is due to the accumulation and subsequent reduction of a mercury salt from tipredane. The second peak, which corresponds with the first polarographic peak, is recommended for use in the determination of tipredane by cathodic stripping voltammetry in the range 1 × 10−8-5 × 10−7 M with preconcentration for 2–3 min at 0 V. The detection limit was calculated to be 5 × 10−10 M. The relative standard deviation determined from seven determinations at the 1 × 10−7 M level was 1.3%." @default.
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• W2100075347 date "1994-11-01" @default.
• W2100075347 modified "2023-09-25" @default.
• W2100075347 title "Polarographic and cathodic stripping voltammetric determination of tipredane" @default.
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• W2100075347 doi "https://doi.org/10.1016/0003-2670(94)00217-7" @default.
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