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  • 1985-1989  (6)
  • Column liquid chromatography  (4)
  • Analytical Chemistry and Spectroscopy  (2)
  • Chemistry  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Study on retention behavior of peropyrene-type polycyclic aromatic hydroccrbons with various bonded stationary phases in reversed-phase liquid chromatography (1988)
    Springer
    Chromatographia 25 (1988), S. 483-486 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Reversed-phase diphenyl and naphtylethyl bonded phases ; Retention/molecular polarizability relationships ; Peropyrene aromatics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The retention behavior of 15 peropyrene-type polycyclic aromatic hydrocarbons was investigated on various bonded stationary phases in reversed-phase liquid chromatography. On diphenyl and naphthylethyl bonded phases, high correlations were obtained between the molecular polarizability of solutes and their retention. However, very low or no correlations were found on various octadecyl bonded phases. These facts are discussed by using the electrostatic interaction concept between the solutes and the stationary phase. We conclude that these observations are due to two reasons: the difference in the degree of planarity of polycyclic aromatic hydrocarbons and the high ability of planarity recognition of octadecyl bonded phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02324817
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Liquid chromatographic determination of dimethadione and trimethadione in human serum on octadecyl treated microporous glass columns (1987)
    Springer
    Chromatographia 23 (1987), S. 325-327 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Packings of octadecylated microporous glass ; Dimethadione and trimethadione in serum ; Pancreatic stones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The liquid chromatographic determination of trimethadione (TMO) and its methabolite, dimethadione (DMO) were studied by high-performance liquid chromatography (HPLC) on octadecyl-modified microporous glasses, prepared with toluene solution containing octadecyl-dimethylchlorosilane, using two types of microporous glass with various mean pore diameters and/or specific surface areas. Using acetonitrile-water mixtures as eluents, TMO and DMO in human serum were separated on the glasses studied, but with different degrees of resolution. In this present study, we report the development of a rapid and selective HPLC method for the simultaneous analysis of TMO and DMO in human serum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02316176
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The influence of the pore size of bonded phases containing phenyl groups on the retention of polycyclic aromatic hydrocarbons in reversedphase liquid chromatography (1985)
    Springer
    Chromatographia 20 (1985), S. 242-248 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Phenyl bonded phases ; Effect of pore size on retention ; Polycyclic aromatic hydrocarbons ; Silica supports
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Differences in bonded phase properties were studied for triphenyl, diphenyl, phenyl and benzyl phases prepared on a variety of silicas. A total of six silicas with pore diameters ranging from 100 to 200 Å were used in the synthesis. The effect of the pore diameter of the silicas on the retention of polycyclic aromatic hydrocarbons are discussed. Differences in retention were observed as a function of pore size, but not much difference was observed with substrates having pore sizes larger than about 170Å. The observed phenomena are explained by two steric exclusion mechanisms, one during the bonding reaction, and the other in the chromatographic analysis. Statistical calculations were performed using the descriptors showing molecular size and/or shape. The results indicated that the difference between bulky phases and less bulky phases was only observed in the degree of shape-recognition ability of the solute while no differences exist in the retention mechanisms on the different phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259696
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Retention behaviour in micro-HPLC on various types of glasses modified with phenyl groups (1986)
    Springer
    Chromatographia 21 (1986), S. 467-472 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Bonded stationary phases ; Phenyl-modified glasses ; Antiepileptic drugs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The retention and selectivity behaviour of some antiepileptic drugs were studied by micro high-performance liquid chromatography on nine types of phenyl-modified glasses, prepared with xylene solution containing phenyldimethylchlorosilane (P), diphenylmethylchlorosilane (D) or triphenylchlorosilane (T), using three types of glass with various mean pore diameters and/or specific surface areas. From elemental analysis data for carbon, the maximum number of accessible phenyl surface groups per 100Å2 of glass (mean pore diameter: 335Å, specific surface area: 69m2/g) in P, D and T gel was calculated to be 2.38, 1.58 and 0.76, respectively. Using various CH3CN−0.01 M KH2PO4 mixtures as eluents, the antiepileptic drugs were separated on all the glasses studied, but with different degrees of resolution. With an increase in the specific surface area, the k′ values of some antiepileptic drugs also increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02341272
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Evaluation of 3-aminopropyltriethoxysilane-treated thin-layer chromatographic plates: Application to glycyrrhetinic acid analysis (1985)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 8 (1985), S. 44-45 
    Details
    ISSN: 0935-6304
    Keywords: Thin-layer chromatography, TLC ; TLC bonded phases ; 3-Aminopropyltriethoxysilane-treated plates ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240080114
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Retention prediction of large and condensed polycyclic aromatic hydrocarbons in reversed-phase microcolumn liquid chromatography with diphenylsilica stationary phase (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 33-38 
    Details
    ISSN: 0935-6304
    Keywords: Large PAH ; Retention prediction ; Reversed-phase ; Microcolumn LC ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The retention behavior of condensed large polycyclic aromatic hydrocarbons has been investigated with diphenylsilica stationary phases in reversed-phase microcolumn liquid chromatography. The results were correlated with two parameters which indicate size and shape of the molecules. Since the resulting equation can be used for retention prediction of large polycyclic aromatic hydrocarbons, computer-assisted “standardless” identification is accomplished for “unknown” compounds contained in the standard.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240110110
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    Paper (German National Licenses)
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