Related Papers
Journal of chromatography. A
Hydrophilic hypercrosslinked polymeric sorbents for the solid-phase extraction of polar contaminants from water
2010 •
Núria Fontanals
Three new hypercrosslinked polymers with hydrophilic character arising from hydroxyl moieties in their skeletons have been prepared in microsphere format and applied to the off-line solid-phase extraction (SPE) of polar compounds from water samples. For sample volumes of 1000 ml, the recoveries of various polar pesticides, such as oxamyl, methomyl, selected phenolic compounds, as well as some pharmaceuticals, were close to 90%. The HXLPP-polar polymer with the best performance characteristics was applied to real samples. Its performance was also compared to commercially available sorbents, such as LiChrolut EN (hydrophobic, hypercrosslinked), Oasis HLB (hydrophilic, macroporous) and Isolute ENV+ (hydrophilic, hypercrosslinked); the new sorbent out-performed the commercially available sorbents. The polymer was applied successfully in off-line SPE of river water samples followed by liquid chromatography and ultraviolet detection, providing a good linear range and detection limits of 0...
Journal of Chromatography A
Evaluation of a new hypercrosslinked polymer as a sorbent for solid-phase extraction of polar compounds
2005 •
Núria Fontanals
Journal of Chromatography A
Solid-phase extraction of polar compounds with a hydrophilic copolymeric sorbent
2004 •
Núria Fontanals
Journal of Chromatography A
New chemically modified polymeric resin for solid-phase extraction of pesticides and phenolic compounds from water
1998 •
Rosa Marcé
New hydrophilic materials for solid-phase extraction
Roberto Bauza
Solid-phase extraction (SPE) is increasingly being used as a sample-pre-treatment technique to cover a wide range of analytes, including the most polar. This involves the development of new sorbents that are able to trap the most polar analytes. We provide an overview of the new sorbents, both commercially available and synthesized in-house, which improve the extraction of the most polar compounds in SPE. We mainly cover polymeric sorbents with a large specific surface area and a hydrophilic character that is obtained by either copolymerizing polar monomers or introducing polar functional groups. Other novel material technology, such as monoliths, is also described. For these new sorbents, we describe morphological and chemical properties that we relate to their retention capabilities towards polar compounds. We discuss the recoveries of polar compounds when these sorbents are used in SPE and compare them with recoveries when other sorbents are used.
Journal of chromatography. A
Weak anion-exchange hypercrosslinked sorbent in on-line solid-phase extraction-liquid chromatography coupling to achieve automated determination with an effective clean-up
2010 •
Rosa Marcé
A mixed-mode polymeric sorbent was on-line coupled to liquid chromatography (LC) for the first time and applied to the selective solid-phase extract a group of pharmaceuticals in complex environmental water samples. The mixed-mode polymeric sorbent is a high-specific surface area hypercrosslinked polymer resin (HXLPP) in the form of monodisperse microspheres further modified with 1,2-ethylenediamine (EDA) moieties. These properties allow its application as a weak anion-exchange (WAX) sorbent in the on-line solid-phase extraction (SPE) coupling. The on-line SPE-LC method developed using the HXLPP-WAX sorbent was successfully applied to percolate a large volume of ultrapure (500 ml), river (250 ml) and effluent sewage (100 ml) water samples. In all the cases, the HXLPP-WAX resin provided near total recoveries of the most acidic compounds studied and clean chromatograms. This is because the ion-exchange interactions enable a washing step to be added to the SPE protocol that removes the...
Chromatographia
Comparison of Hydrophilic Polymeric Sorbents for On-Line Solid-Phase Extraction of Polar Compounds from Aqueous Samples
2004 •
Núria Fontanals
Journal of Chromatography A
Hypercrosslinked polymer microspheres with weak anion-exchange character
2008 •
Núria Fontanals
Journal of chromatography. A
Synthesis and application of hypercrosslinked polymers with weak cation-exchange character for the selective extraction of basic pharmaceuticals from complex environmental water samples
2010 •
Núria Fontanals
The synthesis of high specific surface area sorbents (HXLPP-WCX) in the form of hypercrosslinked polymer microspheres with narrow particle size distributions, average particle diameters around 6 microm, and weak cation-exchange (WCX) character, is described. The WCX character arises from carboxylic acid moieties in the polymers, derived from the comonomer methacrylic acid. A novel HXLPP-WCX sorbent with an attractive set of chemical and physical properties was then used in an off-line solid-phase extraction (SPE) protocol for the selective extraction of a group of basic compounds from complex environmental samples, a priority being the clean separation of the basic compounds of interest from acidic compounds and interferences. The separation power of the new sorbent for basic pharmaceuticals was compared to two commercially available, mixed-mode sorbents, namely Oasis WCX and Strata-X-CW. Under identical experimental conditions, HXLPP-WCX was found to deliver both higher capacity an...
Journal of Polymer Science Part A: Polymer Chemistry
Synthesis of Davankov-type hypercrosslinked resins using different isomer compositions of vinylbenzyl chloride monomer, and application in the solid-phase extraction of polar compounds
2005 •
Núria Fontanals
