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- W2004102563 abstract "A rapid and sensitive reversed-phase liquid chromatographic method (RP-LC) with UV detection has been developed for the determination of free cortisol, cortisone and corticosterone in human urine. The assay was performed after a solid-phase extraction procedure (SPE) with dexamethasone as the internal standard. Chromatographic separation was carried out on a Nucleosil 100 C18 analytical column using a mixture of acetonitrile and water (30 ∶ 70, v/v) as a mobile phase at a flow-rate of 1 mL min−1. Spectrophotometric detection was performed at 240 nm. The method has been validated for accuracy, precision, selectivity, linearity, recovery and stability. The absolute recoveries of glucocorticoids were above 94.6%. The limits of detection (LOD) and quantification (LOQ) were 0.5 and 2 ng mL−1, respectively, for all analytes. Linearity was confirmed in the range of 2–300 ng mL−1 with a correlation coefficient greater than 0.9997 for all steroid hormones. The proposed method was sensitive, robust and specific allowing reliable quantification of steroid hormones. This method was successfully applied for determination of three endogenous glucocorticoid levels in human urine. The studies were performed on 20 sedentary healthy volunteers in comparison to two socially diversified groups, namely 10 parachutists before and after jump and 10 patients with depression. Pharmacokinetic studies performed on these groups indicated that urinary free cortisol and cortisol-to-cortisone ratios can be treated as biomarkers of stress and depressive disorders." @default.
- W2004102563 created "2016-06-24" @default.
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- W2004102563 date "2011-01-01" @default.
- W2004102563 modified "2023-10-18" @default.
- W2004102563 title "Simultaneous determination of urinary cortisol, cortisone and corticosterone in parachutists, depressed patients and healthy controls in view of biomedical and pharmacokinetic studies" @default.
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- W2004102563 doi "https://doi.org/10.1039/c0mb00313a" @default.
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