Showing papers in "Journal of Chromatography A in 1969"

TL;DR: A copper acetate spray reagent has been used for the quantitative densitometric thin-layer chromatography of glycolipids and phospholipids from human CNS myelin and the precision ranges between zero and ± 4.5%.

TL;DR: Developing poly(ethylene)imine cellulose thin layers with phosphate solutions gives improved resolution of complex mixtures of nucleotides and minimizes the tailing of highly radioactive orthophosphate present in the mixtures and thus facilitates chromatographic analysis of crude acid extracts of phosphate-labeled bacteria.

TL;DR: Alumina, activated at 800° and partially deactivated with 5% by weight of water, was found to be the most efficient and silica columns were more effective in the separation of pesticides by differential elution.

TL;DR: Gas-liquid chromatography studies of direct esterification of protein amino acids to n-butyl esters have been carried out by as mentioned in this paper for protein amino acid amino acid synthesis.

TL;DR: RM values were calculated by interpolation or extrapolation from the ranges of linearity between RM values and composition of the mobile phase and the influence of substituent groups on the RM values of the penicillins.

TL;DR: A rapid, simple and reproducible method for the quantitative determination of phospholipids after separation by thin layer chromatography has been described and the method was compared with the generally cited methods used for the same purpose.

TL;DR: A handy method was developed, which permits the separation of labelled intermediates of plant metabolism by thin-layer chromatography on cellulose layers, which is especially suitable for experiments with large numbers of samples.

TL;DR: A rapid method for the separation and quantitation of mono- and oligosaccharides is described, based on the use of Bio-Gel P-2, minus 400 mesh, in a properly designed column with water as eluent at 65°.

TL;DR: Silicones can be synthesized from a variety of pure or mixed monomers on and chemically bonded to silicicic surfaces as discussed by the authors, typically to chromatographic supports The resulting materials are non-extractable, thermally stable coatings which perform well in GLC and can be used for some of the more demanding types of analysis

TL;DR: The gas-liquid chromatographic separation of the N-trimethylsilyl TMS esters of the twenty protein amino acids was achieved after evaluation of a number of combinations of siloxane liquid phases and reaction conditions were investigated for the quantitative silylation.

TL;DR: In this article, the identification of sesquiterpenes by gas-liquid chromatography was evaluated, and the most reproducible form of GLC data was found to be the SESQUERPene data.

TL;DR: The direct extraction in all cases and the ion-exchange technique for narcotics were sufficiently sensitive to provide detection of drug usage 24 h after last administration of drug.

TL;DR: Butyl esters separation from protein amino acids, using acid washed Chromosorb W of various mesh sizes was performed in this paper, where acid washed chromosorb was used to remove the butyl ester from proteins.

TL;DR: A new chromatographic procedure for the separation and quantitation of human hemoglobin components is described, using columns of carboxymethyl-Sephadex G-50 and 0.05 M Tris-maleic acid buffers as developers.

TL;DR: Gel filtration of urine provides a simple and rapid, yet reliable, method for the separation of lactate dehydrogenase, alkaline and acid phosphatase, leucine amino-peptidase, arylsulphatase and β-glucuronidase from interfering substances.

TL;DR: Using thin layers of cellulose powder and a new pair of solvent systems, forty amino acids and related compounds have been separated unambiguously on a single glass plate by two-dimensional chromatography.

TL;DR: In this paper, the new phases OV-1 and OV17 were compared with QF-1 in the gas chromatographic analysis of 80 methyl 5β- and 5α-cholanoates and their complete trimethylsilyl (TMSi) ethers.

TL;DR: The procedure gives a high degree of resolution of nucleotides in tissue extracts, and eluate samples can be freed of salt and water with a minimum of manipulation, by storage at reduced pressure and room temperature over sodium hydroxide and phosphorus pentoxide.

TL;DR: Quantitative gas-liquid chromatography of histidine, using N-TFA n-butyl ester derivatives and histidine converted trimethylsilyl derivative is described in this paper.

TL;DR: A simple and accurate method has been devised for the quantitative analysis of protein hydrolysates using thin-layer chromatography and the results obtained agree well with those obtained by the ∝Technicon’ Automatic Amino Acid Analyzer and with those given in the literature.

TL;DR: Different patterns of elution for grey and white matter extracts were found and the implications are discussed in relation to the chemical and physicochemical characteristics of the different proteolipids and to the receptor properties shown by some of them in grey matter.

TL;DR: In this paper, a description of the details of construction of an apparatus for continuous liquid-solid phase chromatography is given, and a detailed description of its operation is given in detail.

TL;DR: A qualitative and quantitative method of analysis for the acidic reaction products resulting from the oxidation of Hexoses in aqueous alkaline solutions with oxygen is described in this paper, where the residue is then dissolved either in pyridine or dimethylsulfoxide and silylated by means of a mixture of trimethylchlorosilane and hexamethyldisilazane.