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- W2115616191 abstract "This work presents a simple, fast and low-cost method for determining sildenafil citrate (SC) in Viagra® and in similar, generic and manipulated pharmaceutical formulations using flow injection analysis (FIA) with multiple pulse amperometric detection. The method consists on the application of three sequential potential pulses as a function of time. SC is detected at 1.6 and 1.9 V by two different irreversible oxidation processes. The third potential pulse (1.0 V) is applied for the regeneration (cleaning) of the surface of the boron-doped electrode. The limit of detection on an order of 10 nmol L-1 was reached with a relative standard deviation of less than 0.2% (n = 10) for 4.5 X 10-5 mol L-1 CS. The analytical frequency was calculated in 86 injections per hour. The addition recovery studies in all the samples were approximately 100% and the results were validated by chromatographic methods." @default.
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- W2115616191 date "2012-10-01" @default.
- W2115616191 modified "2023-09-23" @default.
- W2115616191 title "Determination of sildenafil citrate (Viagra®) in various pharmaceutical formulations by flow injection analysis with multiple pulse amperometric detection" @default.
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- W2115616191 doi "https://doi.org/10.1590/s0103-50532012005000047" @default.
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