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An inline ion-exchange system in a chemiluminescence-based analyzer for direct analysis of N-nitrosamines in treated was...

Published in Journal of chromatography. A

A newly developed, ion exchange-based inline pretreatment system was used to mitigate the effect of background constituents in natural water and treated wastewater to achieve rapid, reliable, and sensitive analysis of N-nitrosamines. The pretreatment system (anion exchange module, AEM) was incorporated into a high-performance liquid chromatograph (...

Hydrophilicity nano-titania coating modified magnetic graphene oxide for pass-through cleanup of fipronil and its metabo...

Published in Journal of chromatography. A

A novel hydrophilicity nano-titania coating modified magnetic graphene oxide (HTC-Mag-GO) has been synthesized. It has been evaluated in PRiME (process, robustness, improvements, matrix effects, ease of use) pass-through cleanup procedure for human blood prior to analysis of fipronil and its metabolites, i.e., fipronil sulphone, fipronil sulphide a...

Countercurrent separation assisted identification of two mammalian steroid hormones in Vitex negundo.

Published in Journal of chromatography. A

Countercurrent separation (CCS) has been widely used for the separation of high abundance compounds. However, the identification of low abundance compounds, such as mammalian steroid hormones, from natural sources is still a challenging task. A mixture of 14 human steroid hormone reference compounds was prepared for the development of a CCS enrichm...

Magnetic solid-phase extraction of heterocyclic pesticides in environmental water samples using metal-organic frameworks...

Published in Journal of chromatography. A

A simple method of magnetic solid-phase extraction (MSPE) coupled to high performance liquid chromatography (HPLC) was developed for the simultaneous extraction and determination of four kinds of heterocyclic pesticides (carbendazim, triadimefon, chlorfenapyr and fenpyroximate) in environmental water samples. Magnetic metal-organic frameworks (MOFs...

Multiwall carbon nanotube- zirconium oxide nanocomposite hollow fiber solid phase microextraction for determination of p...

Published in Journal of chromatography. A

The purpose of this study was to evaluate the application of hollow fiber solid-phase microextraction (HF-SPME) followed by HPLC-UV to determine the ultra-trace amounts of polycyclic aromatic hydrocarbons (PAHs) as model analytes in complex coffee and tea samples. HF-SPME can be effectively used as an alternative to the direct immersion SPME (DI-SP...

Analyses of simulated moving bed with internal temperature gradients for binary separation of ketoprofen enantiomers usi...

Published in Journal of chromatography. A

Gradient operation of a simulated moving bed (SMB) can improve the separation and purification performance by adjusting adsorption strength in each individual zone according to its functional role. The feasibility of an internal temperature gradient (ITG) established by a difference between feed and desorbent temperatures for binary separation of k...

Corrigendum to "Acid-base reaction-based dispersive liquid-liquid microextraction method for extraction of three classes...

Published in Journal of chromatography. A

Design of two-column batch-to-batch recirculation to enhance performance in ion-exchange chromatography.

Published in Journal of chromatography. A

Preparative liquid chromatography is a separation technique widely used in the manufacturing of fine chemicals and pharmaceuticals. A major drawback of traditional single-column batch chromatography step is the trade-off between product purity and process performance. Recirculation of impure product can be utilized to make the trade-off more favora...

Mixed functional monomers-based monolithic adsorbent for the effective extraction of sulfonylurea herbicides in water an...

Published in Journal of chromatography. A

Effective extraction is a key step in the determination of sulfonylurea herbicides (SUHs) in complicated samples. According to the chemical properties of SUHs, a new monolithic adsorbent utilizing acrylamidophenylboronic acid and vinylimidazole as mixed functional monomers was synthesized. The new adsorbent was employed as the extraction phase of m...

Synthesis of short-chain hydroxyaldehydes and their 2,4-dinitrophenylhydrazone derivatives, and separation of their isom...

Published in Journal of chromatography. A

An easy to handle high-performance liquid chromatography (HPLC) method for the separation of structural isomers of short-chain aldehydes as their hydrazones is presented. Some aldehydes were not available as reference compounds, therefore, synthesis routes for these hydroxy-aldehydes and their dinitrophenylhydrazone derivatives are reported. The re...