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首页> 外文期刊>Electroanalysis >Voltammetric behavior of mifepristone (RU-486) using square-wave and adsortive stripping-wave techniques. Determination in urine samples
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Voltammetric behavior of mifepristone (RU-486) using square-wave and adsortive stripping-wave techniques. Determination in urine samples

机译：米非司酮（RU-486）的伏安行为，使用方波和吸附剥离波技术。尿液样品中的测定

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摘要

The behavior of Mifepristone (RU-486) was studied by square-wave technique, leading to two methods for its determination in aqueous samples and urine samples at pH 2. The application of the square-wave (SW) without the adsorptive accumulation and stripping voltammetric (AdSV) show the maximum response at -0.896 V using an accumulation potential of -0.5 V. The effect of experimental parameters that affect this determination are discussed. For the stripping technique, Mifepristone proved to be more sensitive, yielding signals four times larger than those obtained by applying a square-wave scan without the previous accumulation. The calibration plot to determine Mifepristone was linear in the range 2.4 x 10(-8) and 5.4 x 10(-7) M by stripping mode with an accumulation time t(acc) of 30 s. The relative standard deviation obtained for concentration levels of Mifepristone as low as 2.0 x 10(-7) M with square-wave was 1.17% (n = 10) and with stripping square-wave 2.02% (n = 10) in the same day. The two proposed methods (SW and SWAdSV) were applied to the determination of Mifepristone in urine.
机译：通过方波技术研究了米非司酮（RU-486）的行为，导致了在pH为2的水溶液样品和尿液样品中测定米非司酮的两种方法。方波（SW）的应用没有吸附性积累和汽提伏安法（AdSV）使用-0.5 V的累积电势在-0.896 V时显示出最大响应。讨论了影响此确定的实验参数的影响。对于剥离技术，米非司酮被证明更灵敏，所产生的信号比通过应用方波扫描获得的信号大四倍，而无需事先积累。通过汽提模式确定米非司酮的校准曲线在2.4 x 10（-8）和5.4 x 10（-7）M范围内呈线性，累积时间t（acc）为30 s。同一天，米非司酮浓度水平低至2.0 x 10（-7）M的相对标准偏差在方波下为1.17％（n = 10），在剥离方波时为2.02％（n = 10） 。提议的两种方法（SW和SWAdSV）用于尿液中米非司酮的测定。

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