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  • 1
    Electronic Resource
    Electronic Resource
    Polyacrylate liquid crystalline stationary phases in supercritical fluid chromatography with carbon dioxide mobile phase (1986)
    Springer
    Chromatographia 22 (1986), S. 209-212 
    Details
    ISSN: 1612-1112
    Keywords: Supercritical fluid chromatography ; Polyacrylate liquid crystalline phases ; Carbon dioxide mobile phase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary New polyacrylate liquid crystalline compounds were coated onto glass or fused-silica capillary columns as stationary phases and applied to supercritical fluid chromatography. These stationary phases, were very stable: no bleeding was observed at 200°C and up to 200kg/cm2 pressures of carbon dioxide mobile phase. The wide working range of the capillary column was extended below the g-n transition temperature. Isomeric compounds such as α- and β-methoxynaphthalene, anthracene and phenanthrene and several phenolic compounds were separated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02257330
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  • 2
    Electronic Resource
    Electronic Resource
    A reversed-phase liquid chromatographic columns for the analysis of single-stranded oligo-DNAs (1987)
    Springer
    Chromatographia 23 (1987), S. 247-253 
    Details
    ISSN: 1612-1112
    Keywords: Liquid chromatography ; Reversed-phase chromatography ; Single-stranded oligo-DNAs ; Effect of silica ; Effect of the carbon content
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A reversed-phase liquid chromatographic (RPLC) column, with which large oligodeoxynucleotides (oligo-DNAs) can be separated in well-resolved peaks, has been developed. The column contains only specially selected silica bonded with monochlorodimethyloctadecylsilane. The carbon content of the column packing is the predominant factor to achieve good results. With this column several mixtures containing different large oligo-DNAs could be separated with excellent resolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02311773
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Liquid crystal stationary phases for gas chromatography and supercritical fluid chromatography (1985)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 8 (1985), S. 480-484 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography, GC ; Supercritical fluid chromatography, SFC ; Packed columns ; Fused silica and glass capillary columns ; Liquid crystal stationary phases ; Polyaromatic hydrocarbons ; Insect sex pheromones ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Novel monomeric and polymeric liquid crystalline compounds were synthesized as stationary phases for gas chromatography (GC) and supercritical fluid chromatography (SFC). Monomeric liquid crystalline compounds were used in packed column gas chromatography for the separation of isomeric aromatic compounds and insect sex pheromones. Liquid crystalline polymers possess long nematic ranges and a uniform coating was easily achieved in glass and fused silica capillaries, which could stand temperatures up to 250°C in GC and pressures of 200 MPa at 160°C in SFC. The columns provide excellent selectivity and resolution for fused ring aromatic compounds such as the isomers anthracene and phenanthrene or triphenylene and chrysene.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240080825
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  • 4
    Electronic Resource
    Electronic Resource
    A study of chromatographic properties of liquid crystalline polyacrylates using WCOT columns in gas chromatography (1987)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 10 (1987), S. 77-81 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary columns ; Liquid crystalline stationary phases ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Liquid crystalline polyacrylates (LCPAs) are evaluated as stationary phases for capillary gas chromatography (CGC). Aromatic hydrocarbons as well as polar isomeric compounds are used as test solutes to compare the polarity of the LCPAs with a conventional polysiloxane column and a Carbowax 20M column. The relative polarity of the columns with respect to change in the lateral and terminal substituents is also discussed. Lateral substitution, polarity of the terminal group, together with the solute size, affect the LCPA selectivity.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240100205
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Separation of single-stranded oligonucleotides on polyvinyl alcohol gel column (1985)
    Springer
    Chromatographia 20 (1985), S. 713-716 
    Details
    ISSN: 1612-1112
    Keywords: Size-exclusion chromatography ; Polyvinyl alcohol gel column ; Oligonucleotides ; Hydrophobic interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Separation mechanisms for single-stranded oligodeoxyribo-or oligoribonucleic acid fragments were explored on an Asahipak polyvinyl alcohol gel column (GS-320) by use of sequential isomers of such molecules. Substrates having different base numbers were found to be separated by size-exclusion chromatography while those having the same numbers with different base sequences were isolated by use of the reversed-phase mode. By using those dual modes, a limit for the separation of the samples was found to arise because one mode shifted the peaks of the substrates in the sense opposite to the shift resulting from the other mode and it was found that when substrates had less than nine bases, the solutes eluted separately.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02282928
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  • 6
    Electronic Resource
    Electronic Resource
    Separation and determination of nitrite ion by affinity chromatography with cyano(pheophytinato a)cobalt(III) charged column (1989)
    Springer
    Chromatographia 27 (1989), S. 461-464 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Chlorophyll-bonded stationary phase ; Cyano(pheophytinato a)cobalt(III) ; Pheophytin a
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The separation and determination of the nitrite ion by affinity chromatography is described. The good separation of the nitrite ion was obtained by using cyano-(pheophytinato a)cobalt(III) bonded octadecylsilica as the stationary phase and water of pH 4.3 adjusted by acetic acid as the mobile phase. Conventional ion chromatograph was also used for the analysis of the nitrite ion. For the synthetic samples prepared by mixing the nitrite and nitrate ions, analytical values obtained by affinity chromatography were in agreement with calculated values and close to the analytical values obtained by ion chromatography. In the proposed affinity chromatography, the nitrite and nitrate ions could be determined in the concentration range of 0.15–1.0ppm and 0.1–1.0ppm with relative standard deviations (n=10) of 5.3% and 4.7%, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02319564
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    Paper (German National Licenses)
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