Showing papers on "Polarography published in 1981"
Patent•
27 Oct 1981
TL;DR: In this article, a method and apparatus for more accurate measurements of the glucose content in body fuids by sensing the absolute level of oxygen concentration in the fluid and correcting the output differential measurement indicative of the glycolysis according to the absolute levels of oxygen is presented.
Abstract: A method and apparatus for more accurate measurements of the glucose content in body fuids by sensing the absolute level of oxygen concentration in the fluid and correcting the output differential measurement indicative of the glucose content in the fluid according to the absolute level of oxygen. In the two electrode systems known to the art, the unaltered oxygen electrode of the electrode pair may be employed to read the absolute level of oxygen concentration and in addition, function to establish the difference in oxygen concentration caused by glucose oxidation. In view of the fact that temperature may vary, a thermistor may be included in the electrode system to make temperature corrections for reason that the absolute oxygen reading from either a polarographic or galvanic oxygen electrode is extremely sensitive to temperature and the rate of glucose oxidation is temperature sensitive.
344 citations
125 citations
TL;DR: In this paper, the 1e reduction of titanocene dichloride (η5-Cp2TiCl2) in various solvents has been examined in detail by polarography, voltammetry on a disk electrode, and linear potential sweep voltametric.
68 citations
TL;DR: A tetrahemic protein, cytochrome c 3 from Desulfovibrio desulfuricans strain Norway, was studied by differential pulse polarography and linear sweep voltammetry at hanging mercury electrode.
68 citations
TL;DR: In this paper, cyclic voltammetry and polarography were used to investigate the oxidation of cobalt sandwich complexes with cyclic diolefine and cyclobutadiene ligands.
43 citations
36 citations
32 citations
TL;DR: The Brdicka current can be utilized for the study of protein-protein interaction, as well as for trace analysis of proteins as mentioned in this paper, which can be used for both protein interaction and trace analysis.
28 citations
TL;DR: In this article, the electrochemical behavior of 30 purine and pyrimidine derivatives and of a further 12 derivatives containing sulphur or halogens was studied, and it was demonstrated that most of these substances react with the electrode mercury and form sparingly soluble compounds.
28 citations
TL;DR: In this paper, the same authors showed that the mechanism of reduction at a hanging mercury drop electrode with a constant surface differs from that at a dropping mercury electrode (DME) in terms of the potential region where propionaldehyde is reduced.
26 citations
TL;DR: Reduction peaks in single drop square wave polarography (SDSWP) for metal ions such as Cd(II) and Pb(II), in the presence of picolinic acid gave peak currents that can be an order of magnitude or more greater than diffusion-limited peaks.
Abstract: Reduction peaks in single drop square wave polarography (SDSWP) for metal ions such as Cd(II) and Pb(II) in the presence of picolinic acid gave peak currents that can be an order of magnitude or more greater than diffusion-limited peaks Various studies using techniques such as controlled-potential electrolysis, tast polarography, staircase voltammetry, and SDSWP demonstrated that this enhancement effect was due to the adsorption of metal–picolinate complexes on the electrode surface Since it provides a detection limit of about 02 ppb with ions such as Cd(II), adsorption enhancement appears to be of use in trace analysis under certain circumstances Linearity is observed only up to 1 × 10−5 M and any substance capable of adsorption is a potential interferent
TL;DR: In this article, cyclic voltammetry and polarography were used to establish the electrochemical characteristics of many alkyl cobaloximes, and two reduction steps were observed: R-Co III (DMG) 2 /R-Co II(DMG), where R Cl or alyl group and L ǫ pyridine) have been used for electrocatalytic reductions of organic compounds involving an alkylcobalt intermediate.
TL;DR: In this article, a high-capacity flow-through cell which can be used at a maximum flow rate of 300 ml min-1 has been developed for continuous monitoring of electroactive substances.
TL;DR: In this article, a flow-injection system was used for polarographic determination of isosorbide dinitrate (ISDN) in a flow injection system assembled from commercially available units.
TL;DR: In this article, a liquid chromatographic separation prior to reductive electrochemical determination at the dropping mercury electrode imparts specificity and sensitivity not attainable by conventional polarographic analysis of drugs and their metabolites.
TL;DR: In this article, the effect of medium pH on the polarographic behavior of horse heart cytochrome c has been studied by differential pulse polarography in 0.01 M Trisperchlorate, -acetate and -cacodylate buffer at pH 7.6.
TL;DR: In this article, the transfer of the first electron is reversible and at pH i 1 ) is preceded or at pH > 7 ( i 3 ) is followed by a proton transfer.
TL;DR: In this paper, the pyridinium-carboxylic acid (pyridinyl anion radical) was shown to undergo a homogeneous dimerization, and two radicals then couple to yield a dimer dianion.
TL;DR: In this paper, normal pulse polarography is used to quantify cyanide and sulfide simultaneously by the anodic oxidation of mercury. But the detection limit for cyanide is 18 μg l -1.
TL;DR: In this article, a method to discriminate between the catalytic, CE, ECE and EC mechanisms is proposed based on the kinetic effects that are observed on different time scales in normal pulse polarography (NPP) and in dc polarography.
TL;DR: In this paper, double-potential-step chronocoulometry and staircase voltammetry were used to show that at potentials corresponding to the first polarographic wave, the decyl mercuric halide (which is itself adsorbed onto mercury to the extent of less than a monolayer) undergoes reversible one-electron reduction to advertisersorbed decyl mercury radicals and to adsorbes decyl methyl radical “polymer”; the radicals have a lifetime of approximately 10 −3 s and disproportionate into didecylmercury
TL;DR: In this paper, the polarographic behavior of a series of arylazothiohydantoin derivatives has been investigated at a dropping mercury electrode, and a mechanism for the electrode process covering a wide range of pH is proposed, discussed, and clarified via model compounds, identification of the resulting products of electrolysis, pKa determinations, and the interpretation of σ-E½ plots.
Abstract: The polarographic behaviour of a series of arylazothiohydantoin derivatives has been investigated at a dropping mercury electrode. Two waves were displayed. The first and predominant one is due to the reductive splitting of the azo-linkage by a 4e irreversible process. The second is assumed to be for the reduction of the CONHCO group in the resulting molecule. A mechanism for the electrode process covering a wide range of pH is proposed, discussed, and clarified via model compounds, identification of the resulting products of electrolysis, pKa determinations, and the interpretation of σ–E½ plots.
TL;DR: A short history of the development of the polarography of biopolymers is presented in this paper, where the double-helical and single-stranded DNAs have been studied using a number of modern polarographic techniques, including differential and normal pulse polarography, cyclic voltammetry, etc.
TL;DR: In this paper, the electroreduction of Ni(II)-thiocyanate complexes has been studied using large-scale electrolysis, cyclic voltammetry, chronoamperometry and pulse polarography.
TL;DR: In this article, the electrosorption properties of the following dodecanolpolyglycol ethers C 12 H 25 -O-(CH 2 -CH 2 O) x H x= 4···8 were studied under steady-state conditions both below and above the CMC especially using phase selective ac polarography (tensammetry).
TL;DR: In this paper, polarographic and cyclic voltammetric studies have been carried out on aqueous solutions (10−4−10−3 M) of 249Cf, Sm and Gd.
TL;DR: In this paper, an ultrafiltration device was used to extract the interfering substances before the polarographic determination in 50% ( v v ) methanol-phosphate buffer (pH 6.0).