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  • 1
    Electronic Resource
    Electronic Resource
    Preferential adsorption of swollen polydimethylsiloxane (PDMS) networks and of linear PDMS in 2-butanone/cyclohexane (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 163-175 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Measurements of preferential adsorption, λ(ν), by differential refractometry, and of swelling equilibrium, ν3-, of polydimethylsiloxane (PDMS) networks were carried out in the solvent mixture ethyl methyl ketone (MEK) + cyclohexane (Ch), at 25°C. The preferential adsorption and the total sorption were also determined, by light scattering, for linear PDMS in the same mixed solvent. The behaviour of the system crosslinked PDMS/MEK + Ch is compared with that of the system linear PDMS (dilute solution)/MEK + Ch. The experimental values of ν3 and λ are compared with those predicted by thermodynamic theory. For this comparison, new thermodynamic equations, to calculate preferential and total sorption at finite polymer concentration, are derived using the extended Flory-Huggins model. The derived equations take into account the solvent composition dependence of interaction parameters, neglected (as an approximation) in previous works.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870116
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  • 2
    Electronic Resource
    Electronic Resource
    Adsorptive stripping voltammetry in dispersed media. Application to the determination of the herbicide terbutryn (1995)
    Weinheim : Wiley-Blackwell
    Electroanalysis 7 (1995), S. 644-648 
    Details
    ISSN: 1040-0397
    Keywords: Micellar media ; Terbntryn ; Adsorptive stripping voltammetry ; Emulsions ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The possibility of applying adsorptive stripping voltammetry (AdSV) in dispersed media has been evaluated. Sensitive methods for the determination of the herbicide terbutryn at nanomolar levels by AdSV at the hanging mercury drop electrode in micellar and emulsified media are proposed. The anionic surfactant sodium pentanesulfonate was chosen as the most suitable agent for micellar solutions and oil-water emulsions. On the other hand, ethyl acetate was used as the organic solvent to form terbutryn emulsions. A systematic study of the various experimental parameters that affect the stripping response was carried out by differential pulse voltammetry. When working in a 0.1 mol L-l perchloric acid medium with an accumulation potential of -0.60 V, terbutryn could be determined over the 6.0 × 10-9-4.0 × 10-7 and 6.0 × 10-9-2.0 × 10-7 mol L-1 ranges in micellar (50s accumulation time) and emulsified (70s accumulation time) media, respectively. The limits of detection were 2.2 × 10-9 and 1.1 × 10-9 × mol L-1, and the relative standard deviations (n = 10) were 6.3 and 4.3% in micellar and emulsified media, respectively. The effect of other coexisting herbicides on the terbutryn stripping peak was evaluated. Finally, the developed method in emulsified medium was applied to the determination of terbutryn in spiked tap waters.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140070708
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  • 3
    Electronic Resource
    Electronic Resource
    Electroanalytical study of the hydrolysis of the thienodiazepine clotiazepam (1991)
    Weinheim : Wiley-Blackwell
    Electroanalysis 3 (1991), S. 63-69 
    Details
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The hydrolysis reaction in an alkaline medium of the thiendodiazepine Clotiazepam has been studied by differential pulse polarography at various pH values at 25, 37, and 50°C. In an alkaline medium, Clotiazepam exhibits two well-defined polarographic peaks, attributed to the azomethine group of the parent compound and the carboxylic group of the hydrolysis product, with a potential difference of 0.160 V, practically constant in the pH range studied. Kinetic studies of the reversible hydrolysis process based on the current changes with time of the first polarographic peak in indicate that the process is a pseudo-first-order reaction with a rate constant dependent on hydroxide ion concentration. Arrhenius parameters were also calculated. A voltammetric study of the hydrolysis product has been carried out, and determination methods have been developed by differential pulse voltammetry and differential pulse polarography.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140030112
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  • 4
    Electronic Resource
    Electronic Resource
    Electrochemical oxidation of the diuretic indapamide (1996)
    Weinheim : Wiley-Blackwell
    Electroanalysis 8 (1996), S. 280-284 
    Details
    ISSN: 1040-0397
    Keywords: Indapamide ; Pharmaceutical analysis ; Drug analysis ; Voltammetry ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electrochemical oxidation of the 3-(Aminosulfonyl)-4-chloro-N-(2,3-dihydro-2-methyl-1H-indol-1-y1)benzamide, Indapamide, was studied in aqueous alcoholic media (9:91 MeOH+H2O, pH range 1-13) and two different ionic media (KNO3 and KCl) at carbon electrodes. The oxidation processes attributed to indoline ring and benzamide moiety have been shown to be irreversible and diffusion-controlled over the entire pH range in both media. A differential-pulse voltammetric method was developed upon the basis of the voltammetric peak due to indoline ring, at pH around 2.3 (phosphate buffer) and using KNO3 as ionic medium. The peak current ip, showed a linear relationship with concentration in the range 5.92 × 10 -7 M-1.86 × 10 -5 M with a detection limit of 9.87 × 10-8 M (37 ppb) and a reproducibility (in terms of relative standard deviation) of 4.8% and 9.3% for 10 determinations of 2.67 × 10-6 M and 1.07 × 10-6M concentrations, respectively. The differential-pulse voltammetric method for Indapamide was applied to assays of pharmaceuticals (Tertensif, 2.5mg) and urine samples.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140080314
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  • 5
    Electronic Resource
    Electronic Resource
    Oxidative behavior of the sulfonamidic diuretic bumetanide at carbon paste electrode (1993)
    Weinheim : Wiley-Blackwell
    Electroanalysis 5 (1993), S. 333-338 
    Details
    ISSN: 1040-0397
    Keywords: Bumetanide ; Oxidation ; Carbon paste electrode ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The oxidative behavior of the 3-(aminosulfonyl)-5-(butylamino)-4-phenoxy-benzoic acid, Bumetanide, was studied in hydroalcoholic media (9:91 MeOH:H2O, pH range 1-9) and in two different ionic media (KNO3 and KCl) at a carbon paste electrode. The oxidation process has been shown to be irreversible and predominantly diffusion-controlled over the entire pH range and in both media. A voltammetric method was developed at pH = 2.5 (phosphate buffer) and 0.4 M KNO3 for the quantitative determination of Bumetanide. The peak current was linear with the Bumetanide concentration in the range 2.74 × 10-6 M-2.74 × 10-5 M with a detection limit of 4.39 × 10-7 M (0.16 ppm) and a reproducibility (in terms of relative standard deviation) of 3.61 and 7.60% for 10 determinations of 1.25 × 10-5 M and 4.99 × 10-6 M concentrations, respectively. The method for Bumetanide was applied to assays of pharmaceuticals (Fordiuran, 1 mg) and urine.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140050411
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  • 6
    Electronic Resource
    Electronic Resource
    Vesicles from mixtures of bipolar archaebacterial lipids with egg phosphatidylcholine
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 732 (1983), S. 714-718 
    Details
    ISSN: 0005-2736
    Keywords: (Caldariella acidophila) ; Archaebacterial lipid ; Asymmetric distribution ; Bipolar lipid ; Liposome ; Phosphatidylcholine
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2736(83)90252-3
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  • 7
    Electronic Resource
    Electronic Resource
    Phase transitions of bipolar lipids of thermophilic archaebacteria
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 861 (1986), S. 420-428 
    Details
    ISSN: 0005-2736
    Keywords: (S. solfataricus) ; Archaebacterium ; Bipolar lipid ; Differential scanning calorimetry ; Lipid polymorphism ; Phase transition
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2736(86)90450-5
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  • 8
    Electronic Resource
    Electronic Resource
    Thermotropic properties of bipolar lipids of Sulfolobus solfataricus and of their mixtures with dipalmitoylphosphatidylcholine
    Amsterdam : Elsevier
    Biophysical Chemistry 22 (1985), S. 27-35 
    Details
    ISSN: 0301-4622
    Keywords: Bipolar lipid ; DSC ; Hydration ; Interaction ; Orientation
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0301-4622(85)80023-5
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  • 9
    Electronic Resource
    Electronic Resource
    Dilute solution properties of poly(methyl methacrylate) in acetonitrile + carbon tetrachloride mixtures (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 797-805 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Heterotactic poly(methyl methacrylate) (PMMA) is studied by light scattering and viscometry in the mixture acetonitrile + CCl4. Both liquids are poor solvents of PMMA, but their mixture is a very good solvent of this polymer. The total sorption potential of the coil is calculated from second virial coefficient and intrinsic viscosity results. Unperturbed dimensions, Mark-Houwink exponent, Schulz-Blaschke constant, and coil expansion factor are also determined. The enhanced total solvent sorption is larger in this mixture than in any other cosolvent system of PMMA thus far studied. This is due to the strong repulsive interactions between acetonitrile and CCl4. Such interactions also determine the inversion in preferential sorption that occurs close to equimolar composition. Acetonitrile can interact favourably with the ester group of PMMA and unfavourably with its methylene backbone. The role of such opposing interactions and of liquid order in acetonitrile are taken into account to discuss the results.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.021850416
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  • 10
    Electronic Resource
    Electronic Resource
    The use of the reference element method for stripping voltammetric analysis of natural waters (1992)
    Weinheim : Wiley-Blackwell
    Electroanalysis 4 (1992), S. 549-554 
    Details
    ISSN: 1040-0397
    Keywords: Stripping voltammetry ; internal standard ; natural waters ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An internal standard method is proposed in the stripping analysis of natural waters. The method consists of the introduction into the sample solution of a reference element and subsequent calculation of the concentration of several elements by the increase in the analytical signal from the reference element. Criteria of the reference element selection are given. Calculated proportionality factors k obtained with the use of solutions simulating sea and river waters under the same experimental conditions can be applied to the determination of copper(II), lead(II), and cadmium(II) in natural waters. The use of the internal standard method allows one to substantially shorten the time of analysis (3-5 minutes instead of 30-50 minutes) and to improve accuracy and reproducibility of the analytical data.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140040507
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