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  • 1
    Electronic Resource
    Electronic Resource
    Mobile phase effects in reversed-phase chromatography IV. Retention by n-alkylbenzenes as a function of column temperature and the nature and concentration of organic co-solvent (1982)
    Springer
    Chromatographia 15 (1982), S. 611-615 
    Details
    ISSN: 1612-1112
    Keywords: Reversed phase chromatography ; Alkylbenzenes ; Structure-retention relationship ; Linear free energy relationships
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02280383
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  • 2
    Electronic Resource
    Electronic Resource
    A method to enhance porosity of micro-particles (1988)
    Springer
    Journal of radioanalytical and nuclear chemistry 124 (1988), S. 523-531 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The nuclear track technique (NTT) is used to enhance the porosity of silica micro-particles. The enhanced porosity is a result of the formation of surface and interior pores or tracks in the silica by the action of external and internal fission fragments. The fission tracks produced at the surface and within the interior of the micro-particles are a result of coating the particles with trace quantitities of uranium, instead of having trace quantities of uranium incorporated within the silica matrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02041341
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  • 3
    Electronic Resource
    Electronic Resource
    Ion-pair chromatography with dipolar hetaerons (1982)
    Springer
    Chromatographia 15 (1982), S. 75-82 
    Details
    ISSN: 1612-1112
    Keywords: Ion-pair chromatography ; Zwitterion ; Dipole complex ; Nucleotides ; Naphthylamine sulfonic acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Zwitterionic detergents such as n-decylbetaine and alkyl-sultaines, which contain quaternay ammonium functions, were found to be useful cationic hetaerons in ion-pair chromatography with alkyl-silica bonded stationary phases and acidic eluents. Retention moduli with zwitterion-pairing agents are generally lower than those obtained under comparable conditions with n-alkyltrimethylammonium salts having the same alkyl chain length. This behaviour is attributed to the presence of the negatively charged acid group in zwitterionic hetaerons. The effect is particularly pronounced with eluites having more than one acidic group. Zwitterionic detergents make possible ion pair chromatography with hydroorganic eluents having much lower concentration of organic solvent than those employed conventionally. Moreover they may offer significantly higher selectivity than the commonly used cationic hetaerons. With decylbetaine, the pH of acidic mobile phase strongly effects retention even if the negative charge on the eluite remain the same in the pH range investigated, because dissociation of the carboxylic group (pKa=1.83) drastically reduces retention moduli.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02290437
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  • 4
    Electronic Resource
    Electronic Resource
    Rapid metal-interaction chromatography of proteins and peptides on micropellicular sorbents (1990)
    Springer
    Chromatographia 30 (1990), S. 484-488 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Metal-interaction chromatography ; Rapid HPLC ; Phosphopeptides, proteins and peptides ; Micropellicular stationary phases ; Interaction of phosphate with Fe3+
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Short columns packed with micropellicular stationary phases consisting of 2-μm fused silica microspheres with covalently bound iminodiacetate (IDA) functions at the surface were used for rapid HPLC analysis of proteins by metal-interaction chromatography (MIC). In contrast to conventional porous stationary phases which elicit relatively long analysis times, the columns packed with sorbents having micropellicular configuration and Ni2+ or Co2+ chelated by the IDA functions yielded separation of model proteins in a few minutes with good resolution. A Fe3+/IDA column was used for separation of phosphorylated and non-phosphorylated peptides derived from enzymatically digested erythrocyte membrane proteins. Stability of the Fe3+/IDA column was quite satisfactory as determined by monitoring the iron content of the column effluent and by measuring the amount of iron present in the stationary phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02269792
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  • 5
    Electronic Resource
    Electronic Resource
    Purification of functionally intact 1,4-dihydropyridine receptor from rabbit skeletal muscle by HPLC (1990)
    Springer
    Chromatographia 30 (1990), S. 533-536 
    Details
    ISSN: 1612-1112
    Keywords: Protein purification ; HPLC of receptor ; Calcium channel ; 1,4-Dihydropyridine receptor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Functionally intact 1,4-dihydropyridine receptors have been isolated from digitonin-solubilized skeletal muscle membranes with the combined use of Wheatgerm Lectin-Sepharose affinity chromatography and ion-exchange HPLC. Lectin affinity chromatography was used for the purification of glycoproteins containing N-acetyl-glucosamines residues. Separation of functionally intact 1,4-dihydropyridine receptor/calcium channel complex from Mg2+-ATPase, one of the most abundant glycoproteins in skeletal muscle T-tubular membranes, was successfully performed by HPLC on a TSKgel DEAE-5PW column.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02269800
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  • 6
    Electronic Resource
    Electronic Resource
    Stationary phase effects in reversed-phase chromatography II. Substituent selectivities for retention on various hydrocarbonaceous bonded phases (1982)
    Springer
    Chromatographia 15 (1982), S. 86-90 
    Details
    ISSN: 1612-1112
    Keywords: Reversed-phase chromatography ; Homologous series ; Hydrocarbonaceous bonded phases ; Substituent effect ; Quantitative structure-retention relationships
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Linear free-energy relationships are manifest in the linear dependence of the logarithmic retention factor on the carbon number for homologous series in reversedphase chromatography and allow the comparison of the free-energy increments of substituents for retention of a given elute by different stationary phases. Three methods were used for such comparison. In the first two, methylene group selectivities obtained from retention data obtained with homologous series on different hydrocarbonanceous bonded phases were compared by using different approaches. In the third method the energetics of retention of the end groups such as phenyl-, bromo- and disulfide-moieties of homologous series were examined. The results show that at fixed mobile phase composition and temperature the free energy increments due to methylene groups upon retention by alkyl-silica stationary phases are identical. Only hydrocarbonaceous bonded phases with short (C1–C2) alkyl chains or functional groups of unusual shape show consistent differences from octyl- or octadecyl-silicas. The results broaden the theoretical basis for the development of quantitative structure-retention relationships to be used for the prediction or interpretation of retention data in reversed-phase chromatography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02290439
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  • 7
    Electronic Resource
    Electronic Resource
    Physicochemical measurements by gas chromatography (1980)
    Springer
    Chromatographia 13 (1980), S. 712-712 
    Details
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02303443
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  • 8
    Electronic Resource
    Electronic Resource
    Mobile phase effects in reversed-phase chromatography VI. Thermodynamic models for retention and its dependence on mobile phase composition and temperature (1984)
    Springer
    Chromatographia 18 (1984), S. 353-361 
    Details
    ISSN: 1612-1112
    Keywords: Retention mechanism ; Reversed-phase chromatography ; Retention thermodynamics ; Mobile phase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The physico-chemical framework is examined by comparing the predictions of three models for the combined effects of the composition of the hydroorganic mobile phase and the column temperature on the retention ofn-alkylbenzenes on hydrocarbonaceous bonded stationary phases. The “well-mixed” model leads to expressions for the dependence of retention on three factors which are equivalent to those derived previously from linear extrathermodynamic relationships. The “diachoric” model stems from the assumption that the mobile phase is microscopically heterogeneous and the “displacement” model is identical to the retention model most widely used in chromatography with polar sorbents and less polar solvents. Over limited ranges of mobile phase composition and temperature, each model does describe retention behavior. However, only the wellmixed model describes retention well over the entire range of mobile phase composition and temperature studied here. The success of the well-mixed model, and its limits, give insight into the role of the organic solvent in determining the magnitude of chromatographic retention on non-polar stationary phases with hydro-organic eluents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262480
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  • 9
    Electronic Resource
    Electronic Resource
    Optimierung in der HPLC (1980)
    Springer
    Chromatographia 13 (1980), S. 244-244 
    Details
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261882
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  • 10
    Electronic Resource
    Electronic Resource
    Comparative evaluation of aromatic bonded phases for reversed-phase chromatography (1985)
    Springer
    Chromatographia 20 (1985), S. 641-651 
    Details
    ISSN: 1612-1112
    Keywords: Reversed-phase column liquid chromatography ; Bonded silicas ; Relative retention ; Selectivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Retention factors for alkylbenzenes, polyaromatic hydrocarbons, steroids, amino acids, peptides, nucleotides, nucleosides were measured with phenylsilica, benzylsilica, phenethylsilica and octylsilica stationary phases using hydro-organic eluents containing methanol, acetonitrile or tetrahydrofuran. The retention behavior of the three arylsilicas was similar but distinctly different from that of octylsilica. The difference is attributed to the chemical properties of the organic ligates, i.e., of the alkyl- and aryl functions. The slight variations of retention behavior observed with arylsilicas on the other hand are believed to arise from differences in the pertiment phase ratios. The method used for interpretation of data is based on the analysis of the pertinent retention moduli, relative column retentivities and relative phase ratios. In addition, relationships between eluite structure and retention were examined. The results give insight into various phenomena underlying the retention process in reversed-phase chromatography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262685
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