Showing papers in "Journal of Chromatography A in 1994"

TL;DR: In this article, triscarbamates of the polysaccharides as chiral stationary phases (CSPs) for HPLC are extensively discussed, including cellulose and amylose.

TL;DR: Samples of clothing, grave debris, soil and munition fragments, collected from the Kurdish village of Birjinni, were analysed by GC-MS with selected ion monitoring (SIM) for traces of chemical warfare agents and their degradation products, providing the first documented unequivocal identification of nerve agent residues in environmental samples collected after a chemical attack.

TL;DR: In this article, a review of enantiomeric separations by capillary electrophoretic (CE) techniques is presented, and the fundamental separation theory of each CE technique is discussed from the viewpoint of the optimization of selectivity and resolution.

TL;DR: Complex carbohydrates can frequently be separated using hydrophilic-interaction chromatography (HILIC), which is promising for a variety of analytical and preparative applications.

TL;DR: An historical review of the design of chiral stationary phases (CSPs) in the Pirkle laboratories is presented in this paper, where several recently developed CSPs are also presented.

TL;DR: In this paper, a synthetic polymer selective for (S)-naproxen was prepared by molecular imprinting and copolymerized in the presence of the template, which was extracted from the polymer, leaving specific recognition sites complementary to the template.

TL;DR: In this article, primary and secondary amines are rapidly labelled by 6-aminoquinolyl-N-hydroxysuccinimidyl carbamate to form highly fluorescent asymmetric urea derivatives which are readily amenable to analysis by liquid chromatography.

TL;DR: In this article, a review of existing base matrix properties permits an optimized selection for a particular separation purpose, and a section is devoted to sorbent deterioration and cleaning aspects, both of which have a large impact on the choice criteria for preparative purposes.

TL;DR: In contrast to its conventional preparation from Streptomyces strains the recombinant core streptavidin was produced without a proteolytic processing step, and deleterious effects during the strePTavidin affinity purification of proteins due to residual proteolytics activity in the immobilized streptavein were avoided.

TL;DR: This study demonstrates the separation of tryptic digests of bovine, Candida krusei and equine cytochrome c using a new electrospray ionization (ESI) interface for CE-MS that does not require additional sheath make-up fluid or mechanical assistance to aid the ESI process.

TL;DR: In this article, a new class of eight chloromethylphenyl carbamate derivatives of cellulose was prepared by introducing both an electron-donating methyl group and an electronwithdrawing chloro group on to the phenyl moieties and their chiral recognition abilities were evaluated as chiral stationary phases (CSPs) for high-performance liquid chromatography.

TL;DR: A continuous "molded" rod of porous poly(styrene-co-divinylbenzene) prepared by a bulk free radical polymerization within the confines of a chromatographic column has been used successfully for the reversed-phase HPLC of alkylbenzenes and peptides.

TL;DR: In this paper, a microbore liquid chromatographic system was developed for gradient elution using capillary columns with inner diameters of 50 and 100 μm, and voltage gradients up to 30 000 V can be applied across the length of the column.

TL;DR: High-performance liquid chromatography with photodiode-array detection was used to separate picrocrocin, cis/trans-crocins, cis-carotenoids, glucosyl esters of crocetin and safranal (flavour, monoterpene aldehyde) of saffron.

TL;DR: The analytical separation of enantiomers by capillary gas chromatography on chiral stationary phases (CSPs) is reviewed in this article, where three principal CSPs tailored for hydrogen bonding, coordination and inclusion are currently employed.

TL;DR: In this paper, non-stabilizing dispersion polymerization in combination with molecular imprinting was used to prepare agglomerates of globular micron-sized particles exhibiting molecular recognition properties.

TL;DR: In this article, a simple and rapid dynamic headspace technique was developed to determine volatiles present in virgin olive oil samples, and the results showed that most of the compounds were present in all oils analysed, and only the proportions in which these compounds are present varied.

TL;DR: In this paper, the effects of buffer composition and pH on the velocity of electroosmotic flow were investigated by investigating the influence of buffer compositions and pH levels on the performance of packed capillary electrochromatography.

TL;DR: The applicability of the method to various fields of biosciences is demonstrated with the detection and determination of d -amino acids in bacteria, microfungi, higher plants, invertebrates and vertebrates, including man, and in the amino acid-containing Murchison meteorite.

TL;DR: In this article, theoretically expected general correlations between retention, enantioselectivity and efficiency of chiral chromatographic systems are discussed, taking ligand exchange chromatography as a relatively well studied, example.

TL;DR: In this paper, a high-performance liquid chromatographic method was reported that allowed the determination of organic acids in honey after sample purification by solid-phase extraction, achieving an average recovery of 89% to 104% and the detection limits from 0.002 to 3 ppm (w/w).

TL;DR: In this paper, a simple model that assumes that the copper sites are densely packed and can be blocked by protein adsorption yields binding constants for single-histidine proteins that are similar to the binding constant for free imidazole.

TL;DR: In this article, a methylacrylate-based imprinted dispersion polymers were prepared in situ in a fused-silica capillary as agglomerates of micrometer-sized globular particles, exhibiting antibody mimetic, molecular recognition properties.

TL;DR: In this paper, the HPLC separation of resveratrol and pterostilbene is performed on a reversed phase (C18) with a methanol-formic acid (50 mM) gradient.

TL;DR: In this article, a review of the use of chromatographic resolution on chiral stationary phases has been presented with applications covering different fields and different kinds of molecular chirality, arranged in tables according to their use such as for drugs, pesticides, chiral agents and auxiliaries.

TL;DR: In this paper, the authors re-examine all the TLC equations in order to assess whether the relationship between intercepts and slopes is a basic feature of the chromatographic determination of lipophilicity.

TL;DR: 3,5-dimethylphenylcarbamates of amylose (ADMPC) and cellulose (CDMPC), chemically bonded to 3-aminopropylsilica gel were prepared with 4

TL;DR: In this paper, the authors demonstrate that the pressure pump of micro-HPLC with a commercially available 320 μm I.D. column can be replaced by the electroosmotic "pump" of capillary zone electrophoresis.

TL;DR: The effects of the alignment procedure on the PCA is demonstrated for a set of chromatographic profiles intended for peptide mapping and the problem has been analysed in terms of parameter variations for exponentially modified Gaussian peaks.

TL;DR: On-column concentration of neutral molecules was achieved for the first time in micellar electrokinetic chromatography by means of field-amplified sample stacking by using normal or reversed electrode polarity and produced a 75-85-fold increase in sensitivity for 1,2,4,7- and 1,8-tetrachlorodibenzo-p-dioxins.