ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Methylene Blue/Perfluorosulfonated Ionomer Modified Microcylinder Carbon Fiber Electrode and Its Application for the Determination of Hemoglobin (1994)
    s.l. : American Chemical Society
    Analytical chemistry 66 (1994), S. 4538-4542 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00096a022
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Semi-automatic determination of tin in marine materials by continuous flow hydride generation inductively coupled plasma atomic emission spectrometry (1997)
    Springer
    Fresenius' journal of analytical chemistry 357 (1997), S. 822-826 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  A semi-automated continuous flow hydride generation system with inductively coupled plasma atomic emission spectrometry (ICP-AES) was used for the determination of tin in marine materials. The effects of acids (H2SO4 and HCl) were studied. The analytical parameters were thoroughly investigated. Under optimized conditions, the detection limit is 0.4 ng/ml. Interferences from transition elements were investigated and seven masking reagents were tested. L-cysteine hydrochloride monohydrate (1%) was used to mask the interferences from foreign ions. Finally, the accuracy, checked with a marine standard reference material obtained from the National Research Council (NRC), was within the certified value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050256
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Development of an amperometric detector for the determination of phenolic compounds (1997)
    Springer
    Fresenius' journal of analytical chemistry 359 (1997), S. 542-545 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  Polyhistidine chemically modified electrode is shown to greatly improve the voltammetric waves and increase the current response of phenolic compounds (such as dopamine (DA), epinephrine (E) and catechol (CC)) for their cation-selective quality. When used as amperometric detector, the detection limits are 6×10-9 mol/L for DA, 8×10-9 mol/L for E and 2×10-8 mol/L for CC. The modified electrode has also been used as electrochemical detector for capillary electrophoresis (CE) and the phenolic compounds were successfully separated and detected with high resolution. The electrode has a good stability; 80% of the original response was obtained after being used in CE for one month.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050629
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    An improved ELISA for the determination of tobacco mosaic virus with linear sweep voltammetry detection based on a new system of PAP-H2O2-HRP (1999)
    Springer
    Fresenius' journal of analytical chemistry 364 (1999), S. 758-762 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An improved ELISA for the determination of tobacco mosaic virus (TMV) with linear sweep voltammetry based on a new system of p-aminophenol (PAP)- H2O2- horseradish peroxidase (HRP) has been developed. The enzymatic product 3-[(4-hydroxyphenyl)amino]-4-(2-amino-5-hydroxyphenyl)-6-[(4-hydroxyphenyl)imino]-2,4-cyclohexadiene-1-one, produced from HRP catalyzing the oxidation of PAP with H2O2, yields a sensitive linear sweep voltammetric response at a potential of –0.45 V (vs. SCE) in Britton-Robinson (BR) buffer solution. By using this voltammetric peak, HRP can be measured with a detection limit of 0.4 mU/L and a linear range of 1.0 ∼ 1.0 × 102 mU/ L. The detection limit for the clarified TMV is 4.0 ng/mL and the highest dilution ratio detected for the infected leaf sap is 1 : 3.9 × 106. The processes of the enzyme-catalyzed reaction and the electro-reduction of the product of the enzyme-catalyzed reaction have been investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051428
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Untersuchungen zum polarographischen Verhalten des Rheniums in perchlorsauren Lösungen (1985)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 320 (1985), S. 247-251 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das polarographische Verhalten des Rheniums(VII) wurde in konzentrierteren PerchlorsäureLösungen untersucht. Zur Bestimmung kleiner Rhenium(VII)-Konzentrationen ist eine 10 M Perchlorsäure geeignet. Die Bestimmung kann mit der Gleichstrom-, Wechselstrom- und differentiellen Pulse-Polarographie durchgeführt werden. Mit der Gleichstrompolarographie lassen sich noch 2·10−8 M Re(VII) erfassen. Die Eichkurven sind im Bereich von 5·10−8 bis 6·10−5M linear. Die Temperatur- und Tropfzeitabhängigkeit der polarographischen Ströme macht ihren katalytisch/kinetischen Ursprung wahrscheinlich.
    Notes: Summary The polarographic behaviour of rhenium(VII) was investigated in perchloric acid solutions of higher concentrations. For the polarographic determination of small concentrations of rhenium(VII) a 10 M perchloric acid is properly suited. The determination can be performed by DC-, AC- and DP-polarography. With DC-polarography 2×10−8 M Re(VII) can be detected. The calibration curves are linear in the range from 5×10−8 to 6×10−5M Re(VII). From investigations of the temperature- and droptime dependence the catalytic/kinetic origin of the polarographic currents is made probable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00469579
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Zur Temperaturabhängigkeit polarographischer Ströme (1984)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 319 (1984), S. 240-247 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Zunächst wird ein Überblick über die verschiedenen Verfahren zur Bestimmung der Temperaturkoeffizienten polarographischer Ströme gegeben. Eine einfache Beziehung wird vorgeschlagen, die in allgemeiner Weise die Bestimmung polarographischer Temperaturkoeffizienten erlaubt. Weiterhin werden die Temperaturkoeffizienten verschiedener polarographischer Ströme in 29 Systemen experimentell bestimmt. Die Ergebnisse werden hinsichtlich möglicher Elektrodenreaktionen diskutiert. Der Einfluß von Adsorptionsvorgängen auf die Temperaturabhängigkeit polarographischer Ströme wird besonders betont.
    Notes: Summary At first, a survey is given of the various methods for the determination of the temperature coefficients of polarographic currents. A simple equation is proposed that allows in a general manner the determination of polarographic temperature coefficients. Furtheron, the temperature coefficients of various polarographic currents are experimentally determined in 29 systems. The results are discussed in view of possible electrode reactions. The influence of adsorption on the temperature behaviour of polarographic currents is emphasized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00487265
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    The electrochemical polymerization of redox dye-nile blue for the amperometric determination of hemoglobin (1997)
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 399-402 
    Details
    ISSN: 1040-0397
    Keywords: Electrochemical polymerization ; Nile Blue ; Catalytic reduction ; Amperometric determination ; Glassy carbon electrode ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A semi conducting polymer-modified glassy carbon electrode was fabricated by cyclically sweeping in the potential range of -0.4-1.2 V(vs. SCE) or by electrolyzation at constant potential of 1.4 V in 0.5 M sulfuric acid solution containing 1.0 mM Nile Blue. This redox active polymer could successfully be used for the amperometric determination of hemoglobin. The effect of pH was studied for the polymerization of Nile Blue. It was found that the polymerization did not occur in neutral or basic solutions. The formal potential of this film is -410 mV (pH 7.0) which is more negative than that obtained at the bare electrode in the Nile Blue bulk solution. The electrochemical characteristics of this polymer are discussed. The modified electrode could electrocatalyze the reduction of hemoglobin, and a good linear amperometric response could be obtained over the range of 0.05-7.0 mg/mL (correlation coefficient: 0.985). This modified electrode exhibited good stability and reproducibility for long-term use.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140090509
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Ascorbate sensor based on ‘self-doped’ polyaniline (1997)
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 1185-1188 
    Details
    ISSN: 1040-0397
    Keywords: Self-doped polyaniline ; Ascorbate ; Electrocatalysis ; Sensor ; Polyaniline ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Self-doped polyaniline modified electrodes were successfully fabricated by copolymerization of aniline and m-aminobenzoic acid in 0.5 mol L-1 sulfuric acid. The electrochemical characteristics of this resulting polymer were investigated. The polymer displayed electrochemical activity with the formal potential of 50 mV in pH 7.0 buffer solution. Also, such ‘self-doped’ polyaniline was rather stable for a long-term use. Ascorbate was electrocatalytically oxidized at these ‘self-doped’ polymer-modified electrodes. The effect of pH on the catalysis of ascorbate was explored. By constant potential method, such polymer was also deposited on a dual platinum disk electrode with a gap of 10 μm. The dependence of the film conductivity on the potential, which showed a peak-shaped curve, was obtained. The device also showed a fast off-on response sensitive to ascorbate with a linearity up to 6.0 × 10-3mol L-1 (correlation coefficient 0.996).
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140091512
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Differential pulse adsorptive anodic stripping voltammetric determination of pipemidic acid in tablets at a carbon fiber microdisk electrode (1997)
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 1426-1428 
    Details
    ISSN: 1040-0397
    Keywords: Pipemidic acid ; Microdiskelectrode ; Differential pulse adsorptive stripping voltammetry ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An adsorptive anodic stripping voltammetric determination of pipemidic acid (PPA) in tablets with a carbon fiber microdisk electrode is presented. A sensitive differential pulse adsorptive anodic stripping peak of PPA was found at 1.06 V (vs. Ag/AgCl) in pH 7.0 phosphate buffer solutions. Under the optimal conditions (buffer solution: pH 7.0 0.20 mol/L PBS, accumulation time: 30s, accumulation potential: 0.10V, pulse height: 80 mV, pulse width: 80ms) the height of the peak linearly increased with the concentration of PPA in the range of 2.8 × 10-7-1.2 × 10-6 mol/L. The method is not affected by oxygen, no extraction was required before the voltammetric analysis, and the excipients present in the PPA tablets show no interference with the analysis. The method was used for the determination of PPA in tablets with satisfactory results.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140091810
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Fabrication of a polyglycine chemically modified electrode and its electrocatalytic oxidation to ascorbic acid (1997)
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 788-790 
    Details
    ISSN: 1040-0397
    Keywords: Ascorbic acid ; Polyglycine chemically modified electrode ; Electrocatalysis ; Amperometric detection ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cyclic voltammetry was used to investigate the electrochemical polymerization of glycine at the glassy carbon electrode. The applied voltage range, pH of electrolyte, concentration of monomer, and cyclic number were found to affect the polymerization process. The resulting film displayed a catalytic activity towards the oxidation of ascorbic acid (AA), reducing the overpotential by 350 mV. A catalytic reaction rate constant of 5.86 × 104 M-1 s-1 was determined using a rotating electrode. Hydrodynamic voltammetric experiments were performed to characterize the electrode as an amperometric sensor for the determination of AA. At 0.4 V (in pH 7.0 PBS) the detection limit is 4.0 × 10-8 M (SIN = 3). The linear dynamic range was wide, from 6.0 × 10-8 to 2.5 × 10-4 M.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140091011
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...