doi: 10.1080/00032719008052526pmid: N/A
Abstract This is a scanned image of the original Editorial Board page(s) for this issue.
Kruise, J.; Bergveld, P.; Voorthuyzen, J. A.
doi: 10.1080/00032719008052527pmid: N/A
Abstract In order to promote the development and application of chemical sensors for in vivo monitoring. a series of workshops has been organized by the European Community Concerted Action on “Chemical Sensors for Monitoring”. The third Workshop of this Concerted Action was held on 6–9 March 1990 at the University of Twente in Enschede, the Netherlands. After the lirst two orkshops, in which the clinical aspecfs (Lyon, 8–10 March 1989) and the device strategies (Florence, 12–15 November 1989) were discussed. In this workshop the main topic was the technological aspects of microsensors to be used for hyirnsensing. A report of the third workshop is presented, which is entitled: “In yirp sensing: fundamental approaches and potential promises 01 available technologies”.
Wollenberger, Ulla; Bogdanovskaya, Vera; Bobrin, Sergei; Scheller, Frieder; Tarasevich, Michael
doi: 10.1080/00032719008052528pmid: N/A
Abstract Amperometric electrodes have been constructed using the direct electron transfer between electrode and peroxidase for mediatorless hydrogen peroxide detection at a potential of −0.010 V. For this purpose peroxidase was either adsorbed on pyrographite or immobilized in electrochemically synthesized polypyrrole layers on pyrographite or platinum electrodes.
Luong, J. H. T.; Prusak-sochaczewski, E.
doi: 10.1080/00032719008052529pmid: N/A
Abstract A flow immunoassay system has been developed for the detection of Salmonella typhimurium by immobilization of antibody to Salmonella onto tygon tubing by adsorption and onto polyethylene tubing, by covalent binding. After liquid containing Salmonella cells or Salmonella antigen was allowed to interact with the immobilized. antibody, glucose oxidase labeled antibody to Salmonella was injected to the system. The bound antigen was quantified by electrochemical detection of H2O2 produced from the enzymic oxidation of glucose to gluconic acid. In view of the low non-specific binding, sensitivity and reusability, the polyethylene immunoreactor provided a better performance. The system was capable of detecting as low as 105 − 106 Salmonella cells/ml in less than 10 minutes. The immunoreactor could be regenerated for at least 50 times during one month of the experiment. The detection limit of the tygon immunoreactor was somewhat higher (106 − 109 cells/ml). Even though the anti-Salmonella antibody was easily immobilized on the tygon tubing, the system was not reusabl and exhibited a very high non-specific binding.
Vandecasteele, C.; Vanhoe, H.; Dams, R.; Versieck, J.
doi: 10.1080/00032719008052530pmid: N/A
Abstract The determination of bromine in human serum by inductively coupled plasma-mass spectrometry (ICP-MS) is discussed. Sample preparation was kept as limited as possible: serum samples were only diluted with nitric acid (five- or ten-fold). Indium was added as internal standard. In order to avoid overlap of 40Ar 40Ar with
doi: 10.1080/00032719008052531pmid: N/A
Abstract A simple and sensitive ultraviolet spectrophotometric method has been devised for the determination of amikacin, kanamycin, neomycin and streptomycin in pure form and in some pharmaceutical preparations. The method depends on the nitrosation of the primary amino groups followed by reaction with cyanoacetamide in ammonia medium at 100°C for 30 min, The reaction products exhibit a characteristic absorption. maximum at 270 nm. Beer's law is obeyed within the concentration ranges 4–40 μg ml−1 for amikacin, kanamycin and neomycin and 8–80 μg ml−1 for streptomycin with apparent molar absorptivities of about 1.85 × 104 for the first three compounds and 1.3×104 1. mole−1.cm−1 for streptomycin.
Kapetanović, V.; Veselinović, D.; Sužnjevic, D.
doi: 10.1080/00032719008052532pmid: N/A
Abstract It has been found by dp polarography that cephalexin forms a complex Cu(CEF)2, at pH = 8.7, ionic strength μ = 0.2 and room temperature. The stoichiometric ratio and stability constant values have been evaluated by Lingane's and De Ford and Hume's methods. The overall stability constants, logβ2 = 9.44 and 9.13, have been determined with methods applied.
Khodari, M.; Vire, J. C.; Patriarchs, G. J.; Ghandour, M. A.
doi: 10.1080/00032719008052533pmid: N/A
Abstract Naftazone (1,2-naphthoquinone-2-semicarbazone) undergoes a reversible two-electron transfer in both acidic and alkaline solutions and also gives rise at pH > 7 to an anodic wave attributed to the formation of a mercury derivative. Cathodic stripping voltammetry is proposed to determine the compound down to 5 × 10−9 M after accumulation of its mercury salt formed at -0.05V in a 0.05M sodium hydroxide solution. These results have been compared with those obtained by performing an adsorptive collection of the drug in a pH 3 sodium perchlorate solution. Concentrations ranging from 1 × 10−7 to 2 × 10−7M can be easily investigated, the detection limit being 7 × 10−11M. The influence of several operational parameters has also been considered.
doi: 10.1080/00032719008052534pmid: N/A
Abstract Delayed X-ray spectrometry preceded by fast neutron activation, is a relatively novel application and its capabilities as an analytical tool for the specific determination of Os and Ir in small powdered samples was evaluated. The investigation took the form of a feasibility study which relied heavily on the high sensitivity of the detector used. Detection of the delayed X-rays was achieved with a 100 mm2 Ge detector whose ability to produce optimum photopeak-to-noise ratios formed the basis exploited in this investigation. Analytical conditions are demonstrated over a range of concentrations for the elements of interest and the potential of the technique for application to the general routine analysis of Os and Ir is discussed. We indicate that interferences from the sample matrix can be suppressed to a degree which makes the method almost independent of the matrix. This and other attractive features make the technique a strong rival to conventional activation analysis.
doi: 10.1080/00032719008052535pmid: N/A
Abstract Results in spectrochemical analysis with optical emission spectroscopy(OES) are affected by matrix. Analysis of zinc samples are difficult with other emission excitation sources as arc and spark, since zinc is a volatile element. For this reason, metallic zinc samples and its low alloys were analysed by using a glow discharge lamp in this work. Interelement effects were also investigated in the determination of Al, Cu and Mg in the samples.
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