Solid-phase extraction of gallic acid andascorbic acid in fruits using polymerizeddeep eutectic solvent-modified substrate: supplementary materials

Aim: Novel substrates were synthesized by porous and nonporous polymerization of deep eutectic solventson magnetic silica nanoparticles and introduced for dispersive solid-phase extraction of two analytes.Materials & methods: The prepared substrates were characterized, and an extraction procedure wasimplemented to select the best substrates and eluent. The central composite design acted to optimizethe effects of parameters that influenced the extraction efficiencies. Results: For gallic and ascorbic acids,the limits of detection were obtained at 0.136 and 0.165 μM, respectively, with linear ranges of 0.6–125.2and 0.5–106.8 μM, respectively. Conclusion: The substrate produced good extractions even after beingused three-times and was successfully applied for the analysis of real samples.