Showing papers in "Journal of Chromatography A in 1975"

TL;DR: A simple procedure for preparing a stable stock reagent an working reagents for the detection and determination of phospholipids is proposed, and a simple, rapid and accurate thin-layer chromatographic technique is suggested.

TL;DR: The analysis of saccharides by liquid chromatography on an automated instrument is described in this paper, where conditions for the resolution and quantification of fructose, glucose, sucrose, melibiose, raffinose, betaine and three kestose isomers as well as starch hydrolysates are given.

TL;DR: Several modified adsorbents have been prepared by chemically bonding organic groups to form unimolecular layers on a newly synthesised spherical silica gel, and (b) Spherisorb Alumina A20Y.

TL;DR: In this paper, the authors show that the temperature of an eluent may increase by up to 35° if Δp = 500 atm and the capacity ratio of a sample decreases with increasing Δp.

TL;DR: In this article, the infinite dilution solute partition coefficient in the mixture, KR, is given by where K0A(A) and K0R(S) represent the corresponding partition coefficients in pure A and S, respectively, and ⊘ is a volume fraction.

TL;DR: It was found that excellent resolution of the majority of the nucleotides was obtained at ambient temperatures and the retention times, peak shapes, heights and areas were highly reproducible and there was good linearity of response.

TL;DR: It is suggested that the chromatographically obtained RM and delta RM parameters could find a wider applicability in structure-activity relationships, and that their use would result in improved correlation of data.

TL;DR: Chiral stationary phases have been used extensively for chromatographic enantionmer resolution as mentioned in this paper, with primary emphasis on the use of chiral stationary phase for easier sample preparation, decreased analysis time, and simultaneous chemical as well as optical purity analsis.

TL;DR: This review summarizes all papers that have appeared on the gas chromatography of amino acids (including the iodoamino acids) and their enantiomers in the period 1956-mid-1974.

TL;DR: The thin layer chromatographic (TLC) method described in this paper is a new analytical method for the identification of mono-, di-and trisaccharides, which is a development of existing methods but has been greatly improved by using lactic acid in the solvent system and precoated TLC plates impregnated with NaH 2 PO 4 solution.

TL;DR: In this article, the counter-ion attached to a polystyrene-based, strong cation exchanger alters the chromatographic behavior towards sugars and polyols, and the α- and β-anomers of certain monosaccharides are separated in the presence of several cations.

TL;DR: An attempt is made to define the role of gas chromatography in the investigation of organic substances in water, which is important because the handling of water samples before gas chromatographic (GC) analysis depends entirely on the information expected from the subsequent separation, identification and quantification.

TL;DR: A rapid, highly specific method for the analysis of polychlorinated dibenzo-p-dioxins and polychlorination dibenzofurans in pentachlorophenol and other chlorinated phenols is described, finding significant levels of hexa-, hepta- and octachlorodibenzofuran were found in two commercial products.

TL;DR: The utility of the sequential simplex method in chromatographic methods development is demonstrated by the experimental optimization of separation for several mixtures of isomeric octanes in this article, where the oven temperature and carrier gas flow-rate are varaied simultaneously during the optimization process.

TL;DR: In this paper, column parameters (length and internal diameter) were studied and a study of column parameters showed that an internal diameter of 4.6 mm gave the best results with the injection system used.

TL;DR: DVS-agarose cross-linked with divinyl sulphone is a new matrix for chromatography and immobilized enzymes that has distinct advantages over common agarose gels, and the rigid gel beads form beds permitting very high flow-rates.

TL;DR: The performance of a commonly used high-pressure liquid chromatographic stationary phase, octadecylsilane, has been evaluated for 30 compounds selected as representative of a wide variety of drug substances, and the stationary phase should be especially valuable for the separation of acidic and neutral drugs.

TL;DR: In this paper, a double-column system with one or two glass capillaries is described, where cooling and heating are executed by using a simple stainless-steel mantle tube with two separate entrances for either blowing cool nitrogen generated from liquid nitrogen or blowing hot nitrogen generated by electrical heating.

TL;DR: The feasibility of selectivity detecting mug/kg levels of volatile and non-volatile N-nitroso compounds is established and the theoretical basis for the thermal energy analyzer is discussed.

TL;DR: Phenacyl and benzyl derivatives of some biologically significant dicarboxylic acids have been prepared in a quantitative manner using a crown ether catalyst and separated using reversed-phase chromatography.

TL;DR: In this paper, attempts were made to synthesize all polychlorinated dibenzo-p-dioxin isomers containing six to eight chlorine atoms by micro-scale pyrolysis of different polychlorophenates.

TL;DR: In this paper, a dynamic equation for the distribution coefficient is proposed that accounts for different solute-phase interactions in liquid chromatography, and the effect of solvent composition on retention is shown to be dependent on the probability of solute solvent interaction and thus the concentration of polar solvent in the mobile phase.

TL;DR: Thermal energy analysis (TEA) has been combined with gas chromatography (GC) and the new GC-TEA technique is highly specific to compounds which contain heat labile nitrosyl groups.

TL;DR: A quantitative method for the simultaneous determination of propranolol and its active metabolite 4-hydroxypropranoll in human plasma is described and no interferences from normal plasma constituents or from drugs commonly prescribed together with propr ethanol were detected.