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  • 1
    Electronic Resource
    Electronic Resource
    Molecular shape recognition of polycyclic aromatic hydrocarbons with various alkyl diphenyl bonded phases in microcolumn liquid chromatography (1997)
    Springer
    Chromatographia 44 (1997), S. 613-618 
    Details
    ISSN: 1612-1112
    Keywords: Microcolumn liquid chromatography ; Alkyl diphenyl bonded phase ; Molecular shape recognition ; Polycyclic aromatic hydrocarbons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The basic retention behaviors of polycyclic aromatic hydrocarbons (PAHs) with various novel alkyl diphenyl bonded phases have been examined using microcolumn liquid chromatography The retention behaviors of PAHs with these phases have been compared to those with n-alkyl bonded phases which have the same carbon numbers but methyl side groups instead of phenyl groups. Three different alkyl chain lengths for bothn-alkyl dimenthyl andn-alkyl diphenyl bonded phases such as C4, C8 and C 18 were used in this study. It was found that thesen-alkyl diphenyl phases have a non-planarity recognition capability for small and medium PAHs. It appears that this capability increases as the alkyl chain length of the bonded phases decreases. The short or medium alkyl chain length diphenyl bonded phases retained non-planar solutes better than the planar solutes. This trend is completely opposite to that with dimethyl analogs. This unique retention behavior is believed to be caused by strong molecular-molecular interaction between non-planar solutes and the two phenyl groups in those diphenyl stationary phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02466664
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  • 2
    Electronic Resource
    Electronic Resource
    Computer interactive identification system for polycyclic aromatic hydrocarbons in reversed-phase microcolumn liquid chromatography (1986)
    Springer
    Chromatographia 21 (1986), S. 622-626 
    Details
    ISSN: 1612-1112
    Keywords: Polycyclic aromatic hydrocarbons ; Reversed-phase liquid chromatography ; Computer interactive identification system ; Retention prediction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A computer interactive identification system is proposed which is based on the relationship between retention and molecular properties such as the size and shape of polycyclic aromatic hydrocarbons (PAHs). This system offers an automatic analytical process for liquid chromatography, providing a reliable identification of the separated components. The identification can be further enhanced by the use of multiple detectors such as a multichannel UV detector. The system can be used for optimization procedures, resulting in a highly automatic complex analytical system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02311915
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  • 3
    Electronic Resource
    Electronic Resource
    Retention prediction system coupled with a multichannel ultraviolet detector for the identification of polycyclic aromatic hydrocarbons (1985)
    Springer
    Chromatographia 20 (1985), S. 351-356 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Retention prediction system ; UV multichannel detector ; Polycyclic aromatic hydrocarbons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The retention prediction system assisted by a micro-computer coupled with an UV multichannel detector has been investigated in the separation of polycyclic aromatic hydrocarbons. The method offered very precise identification of components in NBS-SRM-1647 sample without any standard reference substances. It has been proven that the system makes very precise, non-pollutive and convenient environmental analysis possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02269061
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Synthetic ceramic clay material as stationary phase in packed column supercritical fluid chromatography (1991)
    Springer
    Chromatographia 31 (1991), S. 239-242 
    Details
    ISSN: 1612-1112
    Keywords: Supercritical fluid chromatography, packed columns ; Synthesized clay material ; Molecular planarity recognition ; Polycyclic aromatic hydrocarbons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A novel inorganic synthetic clay material (SC) has been evaluated as the stationary phase in packed-column, supercritical fluid chromatography (SFC). The molecular recognition capability of the SC stationary phase in SFC for polycyclic aromatic hydrocarbons has been evaluated using carbon dioxide and carbon dioxide modified with methanol as the mobile phase. This recognition derives from the layer structure of the SC material which acts as a slit to distinguish non-planar solutes from the molecular-molecular interaction between solute and stationary phase and leads to smaller retention for non-planar solutes. The recognition capability is also dependent on the SFC conditions such as column pressure and column temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02275743
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  • 6
    Electronic Resource
    Electronic Resource
    Correlation between retention data of polycyclic aromatic hydrocarbons and several descriptors in supercritical-fluid chromatography (1986)
    Springer
    Chromatographia 21 (1986), S. 219-222 
    Details
    ISSN: 1612-1112
    Keywords: Supercritical-fluid chroamtography ; Polycyclic aromatic hydrocarbons ; Retention prediction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The correlation between retention data of polycyclic aromatic hydrocarbons (PAHs) obtained in various supercritical fluid-chromatographic systems (SFC systems) and several descriptors is investigated in order to determine the dominant factors controlling the retention. It is clear that the separation of PAHs in SFC is primarily controlled by the molecular size of the solute and its polarizability. The retention in SFC can be predicted with help of the equation derived by this study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02311890
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  • 7
    Electronic Resource
    Electronic Resource
    Retention prediction of polycyclic aromatic hydrocarbons in reversed phase liquid chromatography with various mobile phase compositions and column temperatures (1986)
    Springer
    Chromatographia 22 (1986), S. 13-18 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Mobile phase composition and column temperature ; Retention prediction ; Polycyclic aromatic hydrocarbons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The relationship between the logarithmic capacity factor measured in reversed-phase liquid chromatography and the operating conditions including the mobile phase composition and the column temperature is investigated. The strategy described herein can offer the possibility to predict the retention of polycyclic aromatic hydrocarbons without any experiments and standard materials, by utilizing equations describing the relationships between retention, temperature, mobile phase composition and physicochemical properties of the solutes previously stored in the program of the microcomputer-assisted retention prediction system. This concept is one of the most promising techniques for the optimization of the separation conditions in reversed-phase liquid chromatography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02257289
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  • 8
    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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  • 9
    Electronic Resource
    Electronic Resource
    The correlation between molecular polarizability of PAHs and their retention data on various stationary phases in reversed-phase HPLC (1984)
    Springer
    Chromatographia 18 (1984), S. 103-105 
    Details
    ISSN: 1612-1112
    Keywords: Liquid column chromatography (reversed phase) ; Inductive effect ; Dispersive effect ; Polycyclic aromatic hydrocarbons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The equation for the potential energy of interactions established for gas-liquid chromatography has been confirmed in reversed phase liquid chromatography. Equations derived for molecular polarizabilities of PAHs and their retention data have very high correlation coefficients. The results indicate that the inductive effect between solute and stationary phase is the main one and the dispersive effect is very small compared with the inductive effect but its contribution increases with the carbon chain length of the stationary phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268467
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  • 10
    Electronic Resource
    Electronic Resource
    Correlation between the retention data of polycyclic aromatic hydrocarbons and several descriptors in reversed-phase HPLC (1983)
    Springer
    Chromatographia 17 (1983), S. 445-449 
    Details
    ISSN: 1612-1112
    Keywords: Micro-HPLC ; Reversed-phase chromatography ; Polycyclic aromatic hydrocarbons ; Correlation between retention and descriptors ; Effect of the structure of stationary phase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The separation of polycyclic aromatic hydrocarbons (PAH) on various reversed-phase columns (phenyl, ethyl, octyl and octadecyl) have been compared. The correlations between the logarithm of capacity factor (log k′) and several descriptors, which show the molecular size, shape and physical property of a solute, were determined. The results indicated the high possibility to predict the retention of PAH in reversed-phase high performance liquid chromatography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262927
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