doi: 10.1080/00032718608066273pmid: N/A
Abstract This is a scanned image of the original Editorial Board page(s) for this issue.
Benedetti, A. V.; Cilense, M.; Dockal, E. R.; Boring, A. C.; Rabockai, T.
doi: 10.1080/00032718608066274pmid: N/A
Abstract The electrochemical oxidation of [CH3COIII(salen)S]at a platinum electrode was studied, at differnent temperatures, in dimethlyformamide, dimethlacetamide, formamide, propylene carbonate, diemthylslforxide, acetone, hexamthylphosphoranmide and tetrahydrofurn, with 0.5 M NaClo4 as supporting edlctrolyte. The overall electorde process may be described as an ECE type. the anodic peak potentials measured on teh ferrocene/ferrocinium scale, and the decoposition rate constants of the oxidized species, are correlated with the Gutamnn donacity numbers.
Johnson, Bruce P.; Gabrielsen, Bjarne; Matulenko, Mark; Dorsey, John G.; Reichardt, Christian
doi: 10.1080/00032718608066275pmid: N/A
Abstract The ET(30) scale of solvent polarity has been shown to be useful in examining many diverse analytical processes. It is based on the charge transfer absorption of 2,6-diphenyl-4-(2,4,6-triphenyl-N-pyridinio)phenolate (referred to as ET-30 in this paper). Unfortunately, use of the ET(30) scale has been hindered by (a) the lack of a commercial source of the ET-30 dye and (b) the lack of an English language synthetic procedure. Here we discuss recent applications of the ET(30) scale to analytical techniques, as well as a simplified procedure for the synthesis of ET-30.
doi: 10.1080/00032718608066276pmid: N/A
Abstract The ultraviolet fluorescence of tryptophan and tyrosine is quenched when they are complexed with Cu++ and Ni++. Titrations of fixed amounts of the amino acids or their peptides with increments of metal ion performed in dilute buffered solutions, yield curves from which the binding constants of the 1:1 complexes can be determined by curve fitting. The association constants found by this method agree with those obtained by potentiometric titration. The binding of these metal ions to glycyl-L-tryptophan was also measured. Zn++, while not quenching tryptophan fluorescence upon binding, competes with Cu++, thus permitting the Zn++-tryptophan association constant to be found. Unlike potentiometric titration, fluorescence quenching would detect binding even when the metal ion does not displace H+. Inherent limitations of the method involve collisional quenching and self absorption artifacts at high reactant concentrations.
Gallo, August A.; Walters, Frederick H.
doi: 10.1080/00032718608066277pmid: N/A
Abstract 2-Amino-5-methylbenzenesulfonic acid has been investigated as an indirect fluorescent visualization reagent in reversed phase ion pair chromatography. Aliphatic amines coelute as a negative peak which can be quantitated. Using a solvent of 1 mM 2-amino-5-methyl-benzenesulfonic acid, 0.05 M acetic acid, pH = 5.0 buffer and a C18 column, butylamine was quantitated. The calibration curve was linear from 1.0 M to 2.5 × 10−3M with a minimum detectable concentration of 1.01 × 10−3M with a 20 μl injection loop.
André, J. C.; Baudot, Ph.; Loppinet, V.
doi: 10.1080/00032718608066278pmid: N/A
Abstract The constant energy synchronous luminescence which is a synchronous excitation method was used for identification and quantification of dl-amphetamine. The reduction of the Raman scattering is achieved and consequently gives an appreciable increase in apparent sensitivity. The detection limit in pure aqueous solution is thereby brought down to a few ppm, which is often sufficient to reveal its presence in seized powdered material.
Jinno, Kiyokatsu; Hoshino, Tadao; Hondo, Toshinobu
doi: 10.1080/00032718608066279pmid: N/A
Abstract Computer enhanced spectroscopic separation technique has been applied to identification of coeluted components in supercritical fluid chromatography by using an ultraviolet photodiode array multichannel detector. The powerful function such as peak deconvolution procedure has successfully offered thespectroscopic complete separation for even partially or completely coeluted components in super critical fluid chromatography.
El Kheir, Afaf A.; Belal, Saied F.; Ayad, Magda M.; El Adl., Sobhi M.
doi: 10.1080/00032718608066280pmid: N/A
Abstract Two spectrophotometric procedures for the assay of three corticosteroid drugs through oximation and subsequent charge transfer complexation with two electron acceptor substances are proposed. The optimum experimental conditions, and molar ratio of reactants were studied. The applicability of the proposed procedures to assay the tested compounds in tablets from and comparison with an official method revealed the reliability, sensitivity and accuracy of the suggested procedures.
Papadoyannis, I. N.; Caddy, B.
doi: 10.1080/00032718608066281pmid: N/A
Abstract A high performance liquid chromatographic method for the rapid separation and quantitative determination of five barbiturates in pharmaceutical preparations and body fluids has been developed. A C18 reversed phase column was used and the barbiturates were detected at 235nm. A number of eluting systems were examined, the most suitable of them being, Ethanol:Propanol:Methanol:Water (26:5:29:40) at pH = 8.8.
Abdel Hamid, Mohamed E.; Barary, Magda H.; Hassan, Ekram M.; Elsayed, Mahmoud A.
doi: 10.1080/00032718608066282pmid: N/A
Abstract A rapid spectrophotometric method for the determination of retinol palmitate (vitamin A) in the presence of its oxidative degradation product is presented. The method is based on the first-derivative measurement of the peak-trough amplitude at 288 – 336 nm. The mean percentage recovery for mixtures of vitamin A with their respective degradation product was 100(1.0). Graphs of log 0% versus time for vitamin A in 0.1 N hydrochloric acid/isopropanol was a straight line with a slope of −0.0007 min−1. The method has been succesfuly applied to monitor the vitamin stability.
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