Journal of Chromatography A
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Determination of hydroxylated stilbenes in wine by dispersive liquidliquid microextraction followed by gas chromatography mass spectrometry
Dispersive liquid-liquid microextraction (DLLME) has been proposed, for first time, to determine the concentrations of three hydroxylated stilbenes (trans-isomers of pterostilbene, resveratrol and piceatannol) in wine samples. DLLME was preceded by an acetylation step and followed by...
Ruggedness testing and validation of a practical analytical method for >100 veterinary drug residues in bovine muscle by ultrahigh performan...
In this study, optimization, extension, and validation of a streamlined, qualitative and quantitative multiclass, multiresidue method was conducted to monitor >100 veterinary drug residues in meat using ultrahigh-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS...
Programmed elution in comprehensive two-dimensional liquid chromatography
Recent advances in applications of gradient elution in two-dimensional liquid chromatography are reviewed. Benefits of simultaneous programmed elution in two-dimensional liquid chromatography are shown, with emphasis on fast gradient elution in second dimension using various gradient...
Feasability of neat carbon dioxide packed column comprehensive two dimensional supercritical fluid chromatography
The design and implementation of comprehensive two dimensional supercritical fluid chromatography (SFC) using neat carbon dioxide as the mobile phase is described. Two conventional supercritical fluid chromatographs were hyphenated via an on line comprehensive 2D liquid chromatograph...
New supervised alignment method as a preprocessing tool for chromatographic data in metabolomic studies
The purpose of this work was to develop a new aligning algorithm called supervised alignment and to compare its performance with the correlation optimized warping. The supervised alignment is based on a "supervised" selection of a few common peaks presented on each chromatogram. The...
Simultaneous measurement in mass and mass/mass mode for accurate qualitative and quantitative screening analysis of pharmaceuticals in river...
A new approach for the analysis of pharmaceuticals (target and non-target) in water by LC-QTOF-MS is described in this work. The study has been designed to assess the performance of the simultaneous quantitative screening of target compounds, and the qualitative analysis of non-targe...
Quantitative analysis of crude and stabilized bio-oils by comprehensive two-dimensional gas-chromatography
Our method uses a flame ionization detector to quantify the composition, while GC×GC-TOF-MS is used for the qualitative analysis. This method allows quantification of around 150 tentatively identified compounds, describing approximately 80% of total peak volume. The number of quantified compounds i...
Valid internal standard technique for arson detection based on gas chromatographymass spectrometry
The most popular procedures for the detection of residues of accelerants in fire debris are the ones published by the American Society for Testing and Materials (ASTM E1412-07 and E1618-10). The most critical stages of these tests are the conservation of fire debris from the sampling...
Fabrication and evaluation of low-cost agarosezinc nanoporous composite matrix: Influence of adsorbent density and size distribution on the ...
Expanded bed adsorption (EBA), a promising and practical separation technique for adsorption of nanobioproduct/bioproduct, has been widely studied in the past two decades. The development of adsorbent with the special design for expanded bed process is a challenging course. To reduce...
Hollow-fiber liquid-phase microextraction of amphetamine-type stimulants in human hair samples
A fast method was optimized and validated in order to quantify amphetamine-type stimulants (amphetamine, AMP; methamphetamine, MAMP; fenproporex, FPX; 3,4-methylenedioxymethamphetamine, MDMA; and 3,4-methylenedioxyamphetamine, MDA) in human hair samples. The method was based in an in...