Piyaluk Nurerk

A hyper-crosslinked polymer composite alginate hydrogel was developed as a sorbent for dispersive solid-phase extraction of phthalate esters. The hyper-crosslinked polymer was synthesized via microwave-assisted polymerization and subsequently embedded into the alginate hydrogel sorbent. Four extracted target analytes were quantified using high-performance liquid chromatography coupled with diode array detection. The method demonstrated good linearity with R² values exceeding 0.999 for all analytes. The linear ranges were 0.20 to 200 µg L⁻¹ for benzyl butyl phthalate and 0.5 to 200 µg L⁻¹ for dibutyl phthalate, di-2-ethylhexyl phthalate, and di-n-octyl phthalate. Limits of detection ranged from 0.05 to 0.15 µg L⁻¹, while limits of quantification ranged from 0.20 to 0.50 µg L⁻¹. The method exhibited high precision with intra-day and inter-day relative standard deviations (RSDs) between 1.1–3.2% and 1.7–3.7%, respectively. The sorbent showed good reproducibility with RSDs in the range of 0.9 to 4.9% and reusability for up to 11 cycles of adsorption–desorption. The efficiency of the method was comparable with that of a commercial cartridge. Recoveries of phthalate esters from drinking water and artificial tear samples ranged from 90.0 to 100.6%. The developed method was efficient and reliable for the analysis of phthalate esters. Graphical Abstract

Cellulose acetate fibers were modified with a gelatin cryogel adsorbent incorporating an iron–carboxylate metal–organic framework and hypercrosslinked polymer composite. The hybrid adsorption materials facilitated the adsorption ability toward polycyclic aromatic hydrocarbons and were entrapped into gelatin cryogel to be hierarchically coated on cellulose acetate fibers which helped to reduce the clogging problem of packed adsorbent. The composite adsorbent was employed as the solid phase of an in-syringe miniaturized solid-phase extraction system. The adsorbent was packed into the needle hub of a disposable syringe and used to extract and preconcentrate polycyclic aromatic hydrocarbons in water sample. The fabricated porous composite adsorbent was characterized and extraction conditions were optimized to achieve the best extraction performance. High-performance liquid chromatography was employed to separate and quantify extracted PAHs. The developed analysis method provided a linear range of 0.020–50 µg L⁻¹ for phenanthrene and benzo(b)fluoranthene, 0.010–50 µg L⁻¹ for pyrene, 0.0020–50 µg L⁻¹ for benzo(a)anthracene, and 0.0050–50 µg L⁻¹ for benzo(a)pyrene and dibenzo(a,h)anthracene. The limits of detection ranged from 0.5 to 5.0 ng L⁻¹. Recoveries ranged from 89 to 98% with RSDs below 7%. The good stability of the adsorbent allowed up to 21 cycles of efficient extraction and desorption. Graphical abstract