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Showing papers in "Journal of Chromatography A in 1997"


Journal ArticleDOI
TL;DR: In this paper, a review of the current state of knowledge on silica surface chemistry and the impact of the chemistry on chromatography of basic solutes is discussed, and the influence of the silica surfaces on the stability of bonded phases is also described.

651 citations


Journal ArticleDOI
TL;DR: In this paper, a general theory is developed which provides explicit criteria for the choice of the operating conditions of simulated moving bed (SMB) units to achieve the prescribed separation of a mixture characterized by both constant selectivity Langmuir isotherms and variable selectivity modified LSHs.

559 citations


Journal ArticleDOI
TL;DR: The concentration of the extracts proved to be sufficient to determine all secondary metabolites reported to be produced by these species using HPLC with diode array detection, and were confirmed by analyses of 132 pure metabolite standards.

419 citations


Journal ArticleDOI
TL;DR: In this article, the authors compare various techniques in terms of attainable efficiency and speed as well as of the demands on the detectors, and some speculations on future proliferation will be given.

355 citations


Journal ArticleDOI
TL;DR: In this article, continuous porous silica columns with double pore structures with micrometer-size co-continuous throughpores and silica skeletons which have mesopores were prepared for octadecylsilylation.

344 citations


Journal ArticleDOI
TL;DR: In situ chelation-SFE (SFE) as mentioned in this paper was used to extract heavy metals, lanthanides, and actinides from different sample matrices with proper selection of ligands, separation of organic and inorganic metal species may be achieved using this SFE technique.

228 citations


Journal ArticleDOI
TL;DR: Capillary electrophoretic techniques for the separation of enantiomers are reviewed in this paper, where a comprehensive collection of applications to drugs and other compounds of interest is given in tables.

225 citations


Journal ArticleDOI
TL;DR: The qualitative and quantitative aspects of capillary electrophoretic methods used to study drug-protein interactions, viz.

223 citations


Journal ArticleDOI
TL;DR: In this article, a review summarizes the separation selectivity in chiral capillary electrophoresis with charged selectors, i.e., the absolute and the relative mobility difference between the enantiomers, the ratio of apparent mobilities and ratio of effective mobilities as well as the intrinsic selectivity, are compared.

219 citations


Journal ArticleDOI
TL;DR: The review presents a list of the latest separation of enantiomers by CE where inclusion-complexation plays a key role in the stereoselective separation mechanism.

211 citations


Journal ArticleDOI
TL;DR: The potential of hyphenation of microcolumn liquid chromatography with other techniques, more particularly of multidimensional chromatography and microcolumn LC coupled to mass spectrometry is reviewed in this paper.

Journal ArticleDOI
TL;DR: In this paper, two methods for the determination of aliphatic amines in waste water and surface water at sub-ppb level are presented, based on a derivatization of the amines within the aqueous medium with 2,4-dinitrofluorobenzene and benzenesulfonyl chloride, respectively.

Journal ArticleDOI
TL;DR: A brief survey and comparison of chemical fingerprinting techniques by gas chromatography that are currently used for the characterization of petroleum hydrocarbons, the identification of oil spills and in assessing environmental impacts can be found in this paper.

Journal ArticleDOI
TL;DR: In this paper, the authors proposed a simpler and more cost-effective approach, not based on preformed beads but on continuous polymer beds synthesized in situ in the chromatographic tube.

Journal ArticleDOI
TL;DR: In this paper, the results of five reversed-phased high-performance liquid chromatography columns used for the analysis of free and conjugated flavonoids were reported, including C 18 Nova-Pak, C 18 Symmetry and C 18 Genesis columns.

Journal ArticleDOI
TL;DR: In this paper, the phase behavior of aqueous micellar solutions and recent advances in the phase separation technique are described, and the recent use of affinity ligands and water-soluble polymers for controlling extractability of proteins are also introduced.

Journal ArticleDOI
TL;DR: Variability was found between years for each of the five cultivars studied and for each compound in terms of absolute values, whereas the percentage incidence of the single sugars as a total was more stable over the two years of observation.

Journal ArticleDOI
TL;DR: In this article, molecular imprinting of the local anaesthetic (S)-ropivacaine in methacrylate-type polymers was done using an in situ photo-initiated polymerisation process.

Journal ArticleDOI
TL;DR: In this paper, the presence of several organic substances in landfill leachates in Japan was investigated and approximately 190 compounds were detected using several analytical methods, including organic phosphates and phthalates, which originate from plastic additives.

Journal ArticleDOI
TL;DR: A rapid, simple and reliable liquid chromatographic method has been developed for the simultaneous determination of nicotinamide, thiamin, riboflavin, pyridoxine, p Kyridoxal, p Pyridoxamine, cyanocobalamine and folic acid in liquid and powdered infant milk.

Journal ArticleDOI
TL;DR: The Accelerated Solver Extraction (ASE) method as discussed by the authors is a new method for the extraction of organic compounds from soils, sludges and other wastes due to the elevated temperatures and pressures, the ASE is a time-saving procedure with low consumption of solvents.

Journal ArticleDOI
TL;DR: The data suggests that, due to the employment of relatively long columns packed with small particles, CEC may offer peak capacities much higher than HPLC or micro-HPLC, and the consistently observed reduction of the EOF when a capillary having a charged inner wall is packed with particles having charges of the same sign needs further explanation.

Journal ArticleDOI
TL;DR: Soxhlet extraction has been compared with atmospheric microwave assisted extraction, accelerated solvent extraction and supercritical fluid extraction for the extraction of polycyclic aromatic hydrocarbons (PAHs) from native, contaminated soil as discussed by the authors.

Journal ArticleDOI
TL;DR: It is found that endcapping alkyl-bonded stationary phases increases column longevity at pH 7, compared to non-endcapped columns, and that the type of silica support determines the stability of bonded-phase packings.

Journal ArticleDOI
TL;DR: In this paper, the linear free energy relationship (LFE) was used to characterize RP-HPLC systems with poly(styrene-divinylbenzene) phases, as log Palk or log Pcyc, where the latter is the water cyclohexane partition coefficient.

Journal ArticleDOI
TL;DR: The use of micelles in high-performance liquid chromatography and capillary electrophoresis is reviewed by Terabe et al. as discussed by the authors, where the role of various parameters on the overall chromatographic behavior are described.

Journal ArticleDOI
TL;DR: In view of the present interest in capillary electrochromatography (CEC), theories dealing with electroosmotic flow (EOF) in porous media are reviewed with particular regard to the use of packed capillaries in CEC and two models found in the pertinent literature are applicable to CEC.

Journal ArticleDOI
TL;DR: In this article, the application of packed column supercritical fluid chromatography (SFC) for the separation of polar analytes is reviewed and a comparison is drawn between polar and non-polar analytes on open-tubular column SFC.

Journal ArticleDOI
TL;DR: Hydrodynamic and chromatographic properties of these monolithic monoliths containing up to 15% butyl methacrylate units have been determined under conditions typical of hydrophobic interaction chromatography.

Journal ArticleDOI
TL;DR: In this paper, the combination of fluorescence labelling of reduced inorganic sulfur compounds such as sulfide (S2−), sulfite(SO32−) with monobromobimane followed by an extraction of elemental sulfur (S°) by chloroform treatment enables the detection of all mentioned sulfur compounds as well as sulfate (remaining aqueous phase) in the same sample.