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
    Computer simulation and experimental validation of the electrophoretic behavior of proteins. 2. Model improvement and application to isotachophoresis (1992)
    s.l. : American Chemical Society
    Analytical chemistry 64 (1992), S. 2991-2997 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00047a020
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Liquid Sheath Effects on the Separation of Proteins in Capillary Electrophoresis/Electrospray Mass Spectrometry (1994)
    s.l. : American Chemical Society
    Analytical chemistry 66 (1994), S. 4450-4458 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00096a010
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Measurement of mobilities and dissociation constants by capillary isotachophoresis (1989)
    s.l. : American Chemical Society
    Chemical reviews 89 (1989), S. 419-430 
    Details
    ISSN: 1520-6890
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cr00092a011
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Letters to the editor (1987)
    Weinheim : Wiley-Blackwell
    Electrophoresis 8 (1987), S. 253-254 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150080512
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Recent application and developments of capillary isotachophoresis (1997)
    Weinheim : Wiley-Blackwell
    Electrophoresis 18 (1997), S. 2154-2161 
    Details
    ISSN: 0173-0835
    Keywords: Isotachophoresis ; Capillary zone electrophoresis ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Capillary isotachophoresis is a powerful electromigration separation method with a pronounced capability to concentrate trace components in diluted samples. At present, capillary isotachophoresis is utilized predominantly as the first step in on-line combination with capillary zone electrophoresis. This article is a continuation of previous reviews and summarizes the results published during 1993-1996.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150181206
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Mathematical description of electrophoretic separation of weak acids by means of an H+ pulse (1990)
    Weinheim : Wiley-Blackwell
    Electrophoresis 11 (1990), S. 724-731 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: The paper gives a detailed theoretical description of the recently published principle of separation by a dynamic pulse in zone electrophoresis. The theory is illustrated by using a system in which weak acids are separated by migrating against an H+ pulse. The mathematical description pertains to (i) the evolution and migration of the concentration profile of the H+ pulse, and (ii) the migration of a sample substance (here a weak acid) against and through the pulse. As a result the migration (detection) times of the separated sample components are obtained. Based on the theory, a graphical treatment was developed which allows fast optimization of the separation conditions by observing (on the PC monitor) how the trajectories of the substances (drawn in a time vs. distance coordinate system) change with a change in the parameters of the pulse. Some of the results illustrate the possible advantages of using the dynamic pulse method in analytical practice.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150110909
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Identification of peaks in capillary zone electrophoresis based on actual mobilities (1992)
    Weinheim : Wiley-Blackwell
    Electrophoresis 13 (1992), S. 677-682 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: A procedure is proposed for the calculation of the actual effective mobility of a zone from its migration time. It is based on the use of internal standards with known mobilities; the use of two internal standards provides reliable mobility data even if the magnitudes of the effects of sample composition, capillary temperature, capillary length, migration distance, used voltage, as well as the tube length occupied by the injected sample are unknown. Formulas have been derived for the calculation of the actual mobilities, and their experimental verification has been carried out by using a model set of anionic solutes with mobilities ranging from -56 to -20 × 10-9 m2V-1s-1 and chloride as the ion modelling the effect of the sample matrix.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.11501301144
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Theory of zone separation in isotachophoresis: A diffusional approach (1995)
    Weinheim : Wiley-Blackwell
    Electrophoresis 16 (1995), S. 1999-2007 
    Details
    ISSN: 0173-0835
    Keywords: Isotachophoresis ; Zone electrophoresis ; Separation theory ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: The qualitative characteristics of isotachophoresis differ substantially from “classical” separation methods such as chromatography or zone electrophoresis. Self-sharpening zone boundaries and step-like concentration profiles are the most specific features of this method, which does not allow the description of the isotachophoretic separation in usual “chromatographic” terms, such as resolution or number of theoretical plates. A theory is presented in this paper, combining the usual isotachophoretic separation characteristics with the theory of isotachophoretic zone boundary, which is the only element of the isotachophoretic system with dispersional properties. This allows us to consider situations near the limits of the isotachophoretic method as far as both selectivity and sample amount (i.e., zone size) are concerned. Based on a simplified expression of the concentration profiles across the isotachophoretic zone boundary, separation and separation limits are described and discussed in terms of resolution, selectivity and zone capacity. Equations are derived showing the relationships between resolution, boundary width, selectivity, sample amount, and column and electrolyte conditions. A simple phenomenological equation is presented, expressing isotachophoretic resolution as a function of only sample amount (or sample zone length) and boundary width. A thermo-dynamic form of this equation is derived, which is shown to be similar to such an expression for resolution in zone electrophoresis. In both cases resolution is a function of sample selectivity, electric field strength and column length. A simple theoretical model for zone capacity is presented, making it possible to estimate the separation performance of isotachophoretic systems. Based on the presented theory, parallels between isotachophoresis and zone electrophoresis are discussed and both methods are compared.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.11501601328
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Sample self-stacking and sample stacking in zone electrophoresis with major sample components of like charge: General model and scheme of possible modes (1995)
    Weinheim : Wiley-Blackwell
    Electrophoresis 16 (1995), S. 2039-2050 
    Details
    ISSN: 0173-0835
    Keywords: Zone electrophoresis ; Sample stacking ; Sample self-stacking ; Matrix effects ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: A theoretical study is presented of zone electrophoretic behavior of samples that contain one or more minor analytes and at least one major ionogenic component of like charge. Based on a simple model comprising weak univalent anionic electrolytes, conditions are derived under which analytes are temporarily focused isotachophoretically into very narrow zones by a sample self-stacking effect provided by the major sample components. Requirements for minimal/maximal mobility and a background coion concentration dependent minimal concentration of a major sample component (stacker) are presented. For systems in which sample self-stacking does not apply, an expression for the concentrating factor is derived that involves the effects of both nonselective (classical) and selective sample stacking, the latter being a consequence of electrophoretic separation of the minor analyte from the major component. The theory derived is discussed with selected model examples by using both numerical calculation and computer simulation.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.11501601333
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    System peaks in capillary zone electrophoresis. 3. Practical rules for predicting the existence of system peaks in capillary zone electrophoresis of anions using indirect spectrophotometric detectionFor Parts 1 and 2 of the series, see [6] and [7], respectively. (1997)
    Weinheim : Wiley-Blackwell
    Electrophoresis 18 (1997), S. 1998-2007 
    Details
    ISSN: 0173-0835
    Keywords: System peaks ; Indirect detection ; Capillary zone electrophoresis ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: A theoretical and experimental study of the existence and evolution of system peaks in capillary zone electrophoresis (CZE) with indirect spectrophotometric detection is presented with respect to the effect of the number of coions present in the background electrolyte (BGE). It is shown that in BGEs having only one coion (i.e., the UV-absorbing probe anion), the sample produces only negative peaks due to each analyte anion and no system peaks, with the number of sample peaks corresponding to the number of analytes present in the sample injected. In BGEs containing two coions, a sample with one analyte anion produces one negative indirect detection peak and one system peak. The transition between BGEs having one coion and those with two coions has also been studied and it has been shown that an addition of ca. 5% of the second coion to a single coion BGE causes the resulting BGE to behave macroscopically as a regular two-coion BGE. A descriptive model is proposed, based on transient isotachophoresis (transient stacking) of the sample species and of the coion from the BGE which has the closest mobility to the sample ion. This model explains qualitatively the formation and evolution of the sample peak (containing the sample species and being detected by indirect detection due to displacement of the UV-absorbing probe in its zone) and the system peak (containing no sample species and being a vacancy in the continuum of coions of the BGE). It is shown that the system peak may be positive or negative as it corresponds to the situation where the vacancy of one component of the BGE results in an enhanced concentration of the other component. It has been demonstrated that the system peak is created by a vacancy of that component of the BGE which has the greatest difference in mobility relative to that of the sample species. On indirect detection in BGEs containing two coions the sample displaces predominantly the BGE coion which has a mobility closest to that of the analyte anion. In systems with BGEs containing two coions, a sample having n analytes produces n sample peaks and one system peak, the sign and magnitude of which are dependent on the sum of the UV absorbances of the analytes involved. The effect of bicarbonate from atmospheric CO2 has also been studied and it has been shown that weakly alkaline BGEs with a single anionic UV-absorbing coion, such as those currently used for anionic analyses with indirect detection, may suffer from the presence of system peaks due to bicarbonate.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150181120
    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...