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Dispersive solid-phase extraction (DSPE) and magnetic solid-phase extraction (MSPE) are methods of solid-phase sorption preconcentration. Compared to classical solid-phase extraction, these methods have a number of advantages, such as reduced consumption of sorbents and solvents, extraction time, and cost of analysis. The popularity of the method among the analysts is evidenced by the large number of reviews we have summarized in this publication. Information is systematized on different versions of these methods, differing in the way the preconcentration process is carried out, the nature of the sorbents used, and their combination with methods for the subsequent determination of the preconcentrated substances; examples of using DSPE and MSPE for the separation of organic compounds in the analysis of environmental samples, food products and biological fluids are given. [ABSTRACT FROM AUTHOR]

The possibility of combining solid-phase extraction of natural catecholamines (adrenaline, norepinephrine, and dopamine) on a microcolumn filled with hypercrosslinked polystyrene with their subsequent spectrophotometric or solid-phase spectroscopic determination in an eluate using gold nanorods or their nanocomposites with polyurethane foam has been investigated. The desorption of catecholamines from hypercrosslinked polystyrene by various eluents has been studied. It has been shown that the quantitative elution of all three catecholamines is achieved using 6 M acetic acid, which as an eluent is well combined with the proposed determination options. The features of a dynamic sorption extraction of catecholamines from urine and blood serum have been described. It allows you to reduce the influence of the matrix components and increase the analysis sensitivity by concentrating. The average concentration coefficient is 10–56 with sample volumes of 10–300 mL. The developed methods make it possible to determine catecholamines in urine at the level of their normal content. [ABSTRACT FROM AUTHOR]