Showing papers in "Journal of Chromatography A in 2001"

TL;DR: The present implications of their chiral nature and necessity of separating enantiomers are summarised in this article and a brief overview of the actual approaches to perform enantioseparations at analytical and preparative scale is given.

TL;DR: Analytical methods for the trace-level determination of 60 pharmaceuticals in aqueous samples are presented and it was found that several of the compounds under investigation could be detected in groundwaters and their occurrence could be traced back to an impact of municipal or industrial waste water.

TL;DR: An HPLC method is featured that is simple, fast, demonstrates excellent transferability and is ideal for quantitative analysis of pigments in dilute natural water samples.

TL;DR: The applicability of the analytical system for the authenticity control of apple and pear juice was demonstrated by determination of characteristic quercetin and isorhamnetin glycosides, and dihydrochalcones, respectively.

TL;DR: The possible contribution of enantioselective chromatography with respect to the preparation ofEnantiomerically pure compounds is reviewed in the context of the competitive approaches and depending on the application scale, with a special emphasis on the recent progresses achieved in this particular field of separation.

TL;DR: A review of polysaccharide-based chiral stationary phases (CSPs) for the direct separation of enantiomers in high-performance liquid chromatography (HPLC) is presented in this article.

TL;DR: A combined analytical method involving toxicity and liquid chromatography-electrospray ionization-mass spectrometry (LC-ESI-MS) was developed for the determination of pharmaceutical compounds in water samples of Catalonia and the results have been compared with the developed method.

TL;DR: Thin-layer chromatography was used to screen for acetylcholinesterase inhibitors from Amaryllidaceae extracts and could dereplicate the known inhibitor galanthamine at an early stage of the isolation procedure, making this method more sensitive than UV or Dragendorff's reagent detection.

TL;DR: An analytical method is presented enabling the determination of nine neutral pharmaceuticals in groundwater, and for most of the compounds, in rivers and wastewater down to the lower ng/l range, which could not be compensated for by the surrogate standard dihydrocarbamazepine.

TL;DR: The present review article describes the state-of-the-art, scope and limitations, applications and mechanistic considerations at the advent of the millennium incorporating 16 figures and 168 references.

TL;DR: The developed analytical method proved to be very durable during a 3-month field study and the target analytes were detected in concentrations of 5-3,500 ng/l in waste water treatment plant effluents, river water and lake water.

TL;DR: Phenolic compounds including phenolic aldehydes, acids and flavonoids are separated by high-performance liquid chromatography (HPLC) with analysis time shorter than described in the literature.

TL;DR: A HPLC method was developed for the separation and determination of flavonoid and phenolic antioxidants in cranberry juices, which provides a fast and high resolution of individual flavonoids and Phenolic compounds.

TL;DR: The paper presents lists of more than 350 separation examples that include 22 validated methods for drug analyses from serum, plasma, or urine samples on polysaccharide type CSPs under reversed-phase conditions.

TL;DR: The collision-induced dissociation MS-MS spectra of ubiquitous C-glycosidic flavonoids have been systematically studied using hybrid quadrupole time-of-flight and ion-trap mass analysers under various CID energy conditions.

TL;DR: This review summarizes the present state of the art of molecular imprinting to generate tailor-made CSPs and provides an overview of the main factors involved in the manufacturing process that are crucial to the chromatographic performance of the phases.

TL;DR: This review summarizes the current status of enantioseparations using capillary electromigration techniques and gives the authors insights on the selected fundamental aspects and future trends in this field.

TL;DR: The principal themes of the review highlight the development and application of chromatographic techniques for the isolation, purification, separation and detection of the title compounds and common trends and methodological variability are illustrated.

TL;DR: The macrocyclic antibiotics have recently gained popularity as chiral selectors in CE, HPLC and TLC and are complementary to one another, where if a partial enantioresolution is obtained with one glycopeptide, there is a high probability that a baseline or better separation can be obtained with another.

TL;DR: An examination of the retention and separation of several pyrimidines, purines, and amides on silica and amino columns from three manufacturers revealed that mobile phases should contain a buffer or acid for pH control to achieve similar and reproducible results among columns from different sources.

TL;DR: This present review outlines the developmental nature of instrumental approaches to essential oil analysis using gas chromatography, and single-column and multi-dimensional analysis will be covered, as will sample handling or introduction techniques before the analysis step, where these techniques provide some measure of separation.

TL;DR: In this article, a method for the simultaneous determination of major (10-200 mg/l) and minor (0.1-10 mg/L) volatile compounds from wine has been optimized and validated.

TL;DR: Methods for the determination of drug residues in water have been developed based on the combination of liquid chromatography (LC) or capillary electrophoresis (CE) with mass spectrometry (MS) and the applicability of both the HPLC-MS and CE-MS method was demonstrated.

TL;DR: Cation-exchange membranes in a flow-through mode may provide a reasonable alternative to columns for the removal of low levels of impurities such as DNA, host cell protein, and virus in recombinant monoclonal antibodies.

TL;DR: Conventional and rapid HPLC analysis methods compatible with the extraction scheme were developed and unexpected minor forms of malonyl and acetyl isoflavones were discovered in extracts of soy proteins and in pure is oflavone standard preparations.

TL;DR: A method for the simultaneous measurement of two biologically important thiol compounds cysteine and homocysteines and five amino acids including neurotransmitters aspartate and glutamate is reported.

TL;DR: Simulated moving bed (SMB) chromatography was invented in the 1960s in the petrochemical industry and has since then been widely used to produce petrochemicals and sugars at the multi-ton scale.

TL;DR: About ninety empirical functions for the representation of chromatographic peaks have been collected and tabulated and the table, based on almost 200 references, reports for every function the most used name, the most convenient equation, the applications and the mathematical properties.

TL;DR: The method used a C18-bonded silica column with a CH3CN/H2O/CH3COOH gradient elution and clearly separated (20R) and (20S) epimers and geometric isomers at the C-20 position of ginsenosides.

TL;DR: Although precision and accuracy of quantification of the method are still needed, solvent microextraction proved to be a fast, simple and inexpensive tool for preconcentration and matrix isolation of nitroaromatics on a microscale.