Showing papers in "Journal of Chromatography A in 1968"

TL;DR: The new liquid phase combination employed gives resolution of eleven alditol acetates and shows a low level of baseline drift during temperature programming.

TL;DR: A procedure for photodensitometric quantitation of thin-layer chromatograms is described which can give a complete analysis of a mixture of neutral lipids in a single chromatogram without the necessity for reference mixtures.

TL;DR: The replacement of the DEAE-Sephadex A-50, 100 to 270 mesh, by a similar preparation, but particle size 40 to 120 μ, greatly improved the resolution of several human and animal hemoglobin types.

TL;DR: A new chromatographic system employing lithium citrate buffers is described for use on a single 120 cm resin column of the Technicon amino acid analyzer, which should prove useful when it is necessary to quantitate each of a large number of amino acids and related compounds in physiological fluids or tissue homogenates.

TL;DR: By the use of standard densitometric equipment, a quantitative evaluation of the thin-layer gel filtration pattern has been made possible and a linear correlation was found between the R M value and the molecular weight or the molecular radius of a number of globular proteins.

TL;DR: Simple and sensitive methods for the separation and detection of biogenic amines by thin-layer chromatography have been developed and adapted for microradiometric enzyme assays with a high degree of sensitivity and specificity.

TL;DR: A new solvent system for thin-layer chromatography of flavins has been described which gives improved resolution of some of the products of flavin photolysis, and compounds “A” and “C” have tentatively been identified as flavins with a 5-membered side-chain in which one of the hydroxyl groups has been oxidized to a carbonyl group.

TL;DR: Factors which influence separation of carbohydrates on silica gel impregnated with boric acid, and the limitations if the monodimensional technique are investigated are investigated and discussed.

TL;DR: In this paper, the detection sensitivity of 20 insecticide esterase inhibitors, determined in solvent systems consisting of benzene and acetone in various ratios, are presented. But the authors do not consider the effect of different activation techniques on the detection performance.

TL;DR: The validity of the Kubelka—Munk theory of radiative transfer is confirmed after two separable effects, “hyperchromatically” and “curvature of response”, were evaluated experimentally on silica gel layers and correspond closely to that predicted.

TL;DR: In this article, a procedure for quantitative analysis of lipid classes by thin-layer chromatography via charring and densitometry in which the effect of unsaturation is eliminated by hydrogenation is described.

TL;DR: The adsorption chromatography of purines and related heterocyclic compounds on Sephadex G-10 was investigated under different conditions of pH, ionic strength and flow rate and found to give excellent separations.

TL;DR: The gentamicin antibiotic complex is shown to consist of three components, named C1, C1a and C2, and methods are given for preparative separation of these antibiotics by use of cellulose and chromatographic column procedures utilizing the solvent system described for paper and TLC.

TL;DR: Application of the developed method to the analysis of biological materials was accomplished using perchloric acid hydrolysis and anion-exchange removal of the bases from biological background prior to derivatization and GLC analysis.

TL;DR: In this paper, the effect of the composition of the mixed phase is considered for two idealized extreme cases of solute-solvent interaction, and the considerations are illustrated for several solvent systems of the type diluting solvent + oleic acid/buffer solution.

TL;DR: In this article, persilylated fructose was separated into five components by means of gas chromatography and characterized by infrared and mass spectroscopy, and the components which could not be isolated in this manner were investigated with the instrumental combination of GCL and Mass Spectroscopy.

TL;DR: The RF of 26 stilbene aglycones and glucosides have been determined in several systems by means of paper Chromatography and thin-layer chromatography and interpretation of the spectral changes have been made in terms of the structure of stilbenes which also can be divided into several groups due to spectral changes with added sodium ethylate.

TL;DR: Procedures are described for precipitating with barium, the intermediates of the pentose phosphate cycle and some related compounds, and a new colour reaction for erythrose-4-phosphate is reported.

TL;DR: The separation ability of ethylene glycol adipate as a liquid phase was found to be superior to neopentyl glycol sebacate, consistent, and reproducible with respect to time and temperature.