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A critical overview of non-aqueous capillary electrophoresis. Part II: Separation efficiency and analysis time

Published in Journal of Chromatography A

A survey of the literature on non-aqueous capillary zone electrophoresis leaves one with the impression of a prevailing notion that non-aqueous conditions are principally more favorable than conventional aqueous media. Specifically, the application of organic solvents in capillary zone electrophoresis (CZE) is believed to provide the general advant...

Editorial on “Recent applications of on-line sample preconcentration techniques in capillary electrophoresis” by F. Kita...

Published in Journal of Chromatography A

Cucurbit[6]uril in combination with guanidinium ionic liquid as a new type of stationary phase for capillary gas chromat...

Published in Journal of Chromatography A

Cucurbit[n]urils (CBs) possess unique structures and selective interactions with analytes of different variety and high thermal stability and show a great potential as stationary phases for capillary gas chromatography (GC). This work presents the first description of CB6 in combination with a new guanidinium-based ionic liquid (GBIL) as the GC sta...

Rapid and sensitive method for the determination of polycyclic aromatic hydrocarbons in soils using pseudo multiple reac...

Published in Journal of Chromatography A

A method for the rapid determination of 18 polycyclic aromatic hydrocarbons (PAHs) in soil has been established based on a simplified solvent extraction and GC/MS/MS operated in pseudo multiple reaction monitoring mode (PMRM), a technique where the two quadrupoles mass monitor the same m/z. The PMRM approach proved superior to the classic single qu...

Accurate measurements of the true column efficiency and of the instrument band broadening contributions in the presence ...

Published in Journal of Chromatography A

A rapid and simple validated experimental protocol is proposed for the accurate determination of the true intrinsic column efficiency and for that of the variance of the extra-column volume of the instrument used, the latter being obtained without requiring the removal of the chromatographic column from the HPLC system. This protocol was applied to...

The modeling of overloaded elution band profiles in supercritical fluid chromatography

Published in Journal of Chromatography A

Three methods were used to analyze elution bands of methanol on silica, using pure CO2 as the eluent. The results of these analyses were applied to calculate overloaded elution band profiles in supercritical fluid chromatography. The results obtained are compared. To ensure that the mobile phase density varies widely along the column bed, high volu...

Application of random forests method to predict the retention indices of some polycyclic aromatic hydrocarbons

Published in Journal of Chromatography A

In this work, a quantitative structure–retention relationship (QSRR) investigation was carried out based on the new method of random forests (RF) for prediction of the retention indices (RIs) of some polycyclic aromatic hydrocarbon (PAH) compounds. The RIs of these compounds were calculated using the theoretical descriptors generated from their mol...

On-line headspace-multicapillary column-ion mobility spectrometry hyphenation as a tool for the determination of off-fla...

Published in Journal of Chromatography A

In this work, an ion mobility spectrometer (IMS) with a tritium ionization source on-line coupled to a headspace (HS) autosampler and a multicapillary column (MCC) was evaluated for the monitoring of lipid oxidation products in milk with different flavours (cacao, fruits, cereals and nuts) and linseed oil samples enriched with omega-3 acids. In thi...

Use of passive stir bar sorptive extraction as a simple integrative sampling technique of pesticides in freshwaters: Det...

Published in Journal of Chromatography A

Passive sampling represents a cost-effective approach and is more representative than grab sampling for the determination of contaminant concentrations in freshwaters. In this study, we performed the calibration of a promising tool, the passive stir bar sorptive extraction (SBSE), which has previously shown good performances for semi-quantitative m...

Simultaneous determination of fifteen heterocyclic aromatic amines in the urine of smokers and nonsmokers using ultra-hi...

Published in Journal of Chromatography A

A sensitive UHPLC–MS/MS method to simultaneously determine fifteen heterocyclic aromatic amines (HAAs) was developed and applied analyze of human urine. The detection limit of the fifteen HAAs was 0.80–6.06pg/mL and the quantitation limit was 2.65–20.2pg/mL. The intra-day and inter-day precisions of all HAAs were ≤10%. Based on the high sensitivity...