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  • 1
    Electronic Resource
    Electronic Resource
    Compatibility and universality of the retention prediction system for polycyclic aromatic hydrocarbons in reversed-phase liquid chromatography (1986)
    Springer
    Chromatographia 21 (1986), S. 24-28 
    Details
    ISSN: 1612-1112
    Keywords: Column-liquid chromatography ; Retention prediction system ; Reversed-phase ; Compatibility ; Polycyclic aromatic hydrocarbons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary System-compatibility and universality of the retention prediction concept has been investigated for polycyclic aromatic hydrocarbons in reversed-phase liquid chromatography. The results clearly indicate that the retention prediction approach has a very high potential for optimization of separation conditions in almost all reversed-phase systems, and allows more precise and rapid analysis. This approach may be one of the best optimization techniques, because the system does not require any standard materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02310590
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    Paper (German National Licenses)
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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Retention behaviour of typical antiepileptic drugs and PTH amino acids in high-performance liquid chromatography on various types of glasses modified with octadecyl groups (1987)
    Springer
    Chromatographia 23 (1987), S. 373-376 
    Details
    ISSN: 1612-1112
    Keywords: Liquid column chromatography ; Porous glass ; Octadecyl-modified glasses ; Antiepileptic drugs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The retention behaviour of typical antiepileptic drugs or PTH amino acids was studied by high-performance liquid chromatography on four types of octadecyl-modified glasses, prepared with dry toluene solution containing octadecyldimethylchlorosilane (ODS) or trimethylchlorosilane, using two types of glass with various mean pore diameters and specific surface areas. From elemental analysis data for carbon, the maximum number of accessible ODS surface groups per gram of glass was calculated as 0.323×1021.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02316186
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of stationary phase properties and solute molecular size on retention of PAHs in reversed-phase liquid chromatography (1984)
    Springer
    Chromatographia 18 (1984), S. 677-679 
    Details
    ISSN: 1612-1112
    Keywords: Polycyclic aromatic hydrocarbons ; Column liquid chromatography ; Polyphenyl bonded phases ; Retention and carbon content
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The relationship between the retention of PAHs having various molecular sizes and the carbon contents (%) of bonded stationary phases with various types of ligands were investigated. The examined stationary phases were phenyl, diphenyl, triphenyl and benzyl-bonded silicas. The data indicated that sometimes it is not true that the retention of any solute relates linearly to the carbon content of the stationary phase. As the result, it is suggested that the pore size distribution of the silica support, the bulkiness of the ligand bonded to the silica and the molecular size of solute should also be considered before any precise statement can be made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02265813
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    Paper (German National Licenses)
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  • 5
    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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