Adsorption Preconcentration of Flavonoids on Ordered Mesoporous Silica Synthesized in the Presence of a Potential Adsorbate

The application of nanostructured adsorbents in sample preparation (extraction and preconcentration) of multicomponent mixtures in the solid-phase extraction of organic compounds is gaining significant interest. This study examines the adsorption properties of ordered mesoporous analogues of SBA-15, synthesized in the presence of quercetin as a potential adsorbate. The work explores the specific features of the adsorption-based recovery and preconcentration of quercetin, dihydroquercetin, naringin, and rutin under dynamic conditions from acetonitrile solutions using the breakthrough curve method. The use of the generalized optimization criterion of adsorption preconcentration CE, within the framework of the Venitsianov–Tsysin model of dynamic adsorption preconcentration, taking into account the limiting (mixed-diffusion) stage of adsorption kinetics, enabled the evaluation of the efficiency of the adsorption preconcentration of flavonoids on the studied adsorbents. The results demonstrate that the use of ordered silica synthesized in the presence of a potential adsorbate significantly enhances concentration efficiency compared to nonstructured silicas or unmodified SBA-15 analogue samples.