title: Multicore Magnetic Nanoparticles Coated with Oligomeric Micelles: Characterization and Potential for the Extraction of Contaminants over a Wide Polarity Range.
abstract: Oligomeric micelles from sodium undecylenate (oSUD) were chemisorbed to magnetic iron oxide nanoparticles (MNPs) through a single-step synthetic route involving the simultaneous nanoparticle formation and functionalization in an aqueous medium. The resulting spherical nanoparticles (MNPs-oSUD) consisted of a concatenation of iron oxide cores, with an average size of 7.7 nm, bound by oSUD micelles (particle average diameter of ca. 200 nm). Micellar coverage was ∼50% of the MNP-oSUD (by weight) and offered multiple retention mechanisms (e.g., dispersion, hydrogen bonding, polar, and ionic) for solute solubilization while keeping it intact during analyte elution. The high density of micelles and variety of interactions provided by this sorbent rendered it highly efficient for the extraction of aromatic amines in a wide polarity range (log Kowvalues from -0.80 to 4.05) from textiles, urine, and wastewater. Extraction took 5 min, no cleanup or evaporation of the extracts was needed and the method, based on LC-MS/MS quantitation, proved matrix-independent. Recoveries for 17 aromatic amines in samples were in the range of 93%-123% while those with negative log Kowvalues were in the range of 69%-87%. Detection limits for aromatic amines in textiles (0.007-2 mg kg-1) were well below the limits legislated by the European Union (EU) (30 mg kg-1) and those in urine and wastewater (0.004-1.5 μg L-1) were at the level usually found in real-world applications. All the analyzed samples were positive in aromatic amines. The easy synthesis and excellent extraction properties of MNPs-oSUD anticipate their high potential not only for multiresidue analysis but also in other fields such as water remediation.
authors.affiliation: Laboratoire de Chimie physique Macromoléculaire, BP 1524 Université d Oran1 Ahmed Benbella , 31000 Oran, Algeria.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Naous
authors.affiliation: Department of Analytical Chemisty, Institute of Fine Chemistry and Nanochemistry, Marie Curie Building (Annex), Campus of Rabanales, University of Córdoba , 14071 Córdoba, Spain.
authors.forename: Diego
authors.initials: D
authors.lastname: García-Gómez
authors.affiliation: Department of Analytical Chemisty, Institute of Fine Chemistry and Nanochemistry, Marie Curie Building (Annex), Campus of Rabanales, University of Córdoba , 14071 Córdoba, Spain.
authors.forename: Francisco José
authors.initials: FJ
authors.lastname: López-Jiménez
authors.affiliation: Laboratoire de Chimie physique Macromoléculaire, BP 1524 Université d Oran1 Ahmed Benbella , 31000 Oran, Algeria.|Département de Physique-Chimie, Ecole Nationale Polytechnique d'Oran , B.P. 1523 El M'Nanouer, 31000, Oran, Algeria.
authors.forename: Farida
authors.initials: F
authors.lastname: Bouanani
authors.affiliation: Department of Analytical Chemisty, Institute of Fine Chemistry and Nanochemistry, Marie Curie Building (Annex), Campus of Rabanales, University of Córdoba , 14071 Córdoba, Spain.
authors.forename: María Loreto
authors.initials: ML
authors.lastname: Lunar
authors.affiliation: Department of Analytical Chemisty, Institute of Fine Chemistry and Nanochemistry, Marie Curie Building (Annex), Campus of Rabanales, University of Córdoba , 14071 Córdoba, Spain.
authors.forename: Soledad
authors.identifier: 0000-0002-9128-4787
authors.initials: S
authors.lastname: Rubio