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• W2995819504 endingPage "460784" @default.
• W2995819504 startingPage "460784" @default.
• W2995819504 abstract "Micellar liquid chromatography (MLC) is a reversed-phase mode with mobile phases containing an organic solvent and a micellised surfactant. Most procedures developed in MLC are implemented in the isocratic mode, since the general elution problem in chromatography is less troublesome. However, gradient elution may be still useful in MLC to analyse mixtures of compounds within a wide range of polarities, in shorter times. MLC using gradients is attractive to determine by direct injection moderate to low polar compounds in physiological samples. In these analyses, the use of initial micellar conditions (isocratic or gradient) with a fixed amount of surfactant above the critical micellar concentration, keeping the organic solvent content low, will provide better protection of the column against the precipitation of the proteins in the physiological fluid. Once the proteins are swept away, the elution strength can be increased using a positive gradient of organic solvent to reduce the analysis time. This may give rise to the transition from the micellar to the submicellar mode, since micelles are destroyed at sufficiently high concentration of organic solvent. In this work, several retention models covering extended solvent domains in MLC are developed and tested, and applied to investigate the performance in isocratic, linear and multi-linear gradient separations. The study was applied to the screening of β-adrenoceptor antagonists in urine samples, using mobile phases prepared with sodium dodecyl sulphate and 1-propanol. Predicted chromatograms were highly accurate in all situations, although suffered of baseline problems and minor shifts for peaks eluting close to a steep gradient segment. Two columns (C18 and C8) were investigated, with the C8 column being preferable owing to the smaller amount of adsorbed surfactant." @default.
• W2995819504 created "2019-12-26" @default.
• W2995819504 creator A5013147463 @default.
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• W2995819504 date "2020-04-01" @default.
• W2995819504 modified "2023-10-16" @default.
• W2995819504 title "Interpretive search of optimal isocratic and gradient separations in micellar liquid chromatography in extended organic solvent domains" @default.
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• W2995819504 doi "https://doi.org/10.1016/j.chroma.2019.460784" @default.
• W2995819504 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31864726" @default.
• W2995819504 hasPublicationYear "2020" @default.
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