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  • 1
    Digitale Medien
    Digitale Medien
    A system for collecting high-resolution time-of-flight mass spectrometric data (1987)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 14 (1987), S. 295-299 
    Details
    ISSN: 0887-6134
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bms.1200140609
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  • 2
    Digitale Medien
    Digitale Medien
    A study in high-temperature silylation of silica (1985)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 8 (1985), S. 709-714 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Deactivation ; Capillary columns ; Silylation ; HPLC-silica ; Surface group concentration ; Pore alterations ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: High-temperature silylation (HTS) used for the deactivation of capillary columns was studied on the silica commonly used in HPLC to gain a better insight into this process. LiChrosorb Si 100 was silylated with disilazanes at different temperatures and the materials obtained were compared in terms of organic and silanol group surface concentration, IR reflection spectra, HPLC behavior, and pore distribution parameters. Applying diphenyltetramethyldisilazane, the volatile reaction products were monitored during the HTS process. With increasing silylation temperature up to 400°C the silanol surface concentration is reduced to a very small level independent of the organic group concentration which exhibits a broad maximum depending upon substituents and temperature. Up to 350°C triorganosiloxy groups prevail as bonded organic groups. It could be proved that HTS is accompanied by pore alterations of the silica matrix. Arguments proposed by different authors in explaining HTS effects are discussed.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240081104
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  • 3
    Digitale Medien
    Digitale Medien
    HPLC in packed microbore flexible silica capillaries. Part 2: Estimation and calculation of extra-column band broadening (1984)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 276-278 
    Details
    ISSN: 0935-6304
    Schlagwort(e): HPLC, Packed microbore columns ; Band broadening and flow rate ; Calculated van Deemter plot ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240070510
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  • 4
    Digitale Medien
    Digitale Medien
    Quantitative determination of airbone C1- and C2-halocarbons by GC/ECD (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 51-56 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Air analysis ; Airborne halocarbons ; Chlorocarbons ; Electron capture detector ; Forest decline ; Halocarbons ; Thermodesorption ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The atmospheric levels of C1- and C2-halocarbons are determined by trapping on an adsorbent, thermodesorption, cryofocussing, gas chromatographic separation on a thick-film capillary, and electron-capture detection. The various aspects relevant to reliability and accuracy are discussed, such as type of adsorbent, range of detector response, and levels of contaminants present in blanks. These in turn have implications for optimum sample size and amount of adsorbent. The adopted method is suitable for routine analysis of airborne halocarbons at variable locations. The air concentrations of C1- and C2-halocarbons on the ground of mountain forests are similar to those in cities, a fact which supports the hypothesis that chlorocarbons are involved in the initiation of a phytotoxicological phenomenon commonly referred to as “forest decline”.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240110114
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  • 5
    Digitale Medien
    Digitale Medien
    Chiral stationary phases for capillary gas chromatography: Towards higher selectivity and stability (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 787-792 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Chiral gas chromatography ; Microbore capillaries ; Enantioselectivity ; Chiral polysiloxane, crosslinking ; Chirasil-Val ; Selector, chiral ; Thermal stability ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Thermal stability and enantioselectivity of chiral polysiloxane stationary phases for gas chromatography depend upon the composition and purity of the polymer matrix, its functional groups, the chiral selector, and the pretreatment of the inner surface of the capillary. Under proper conditions, narrow-bore capillaries can be prepared which may be used up to 300 °C for short times. Crosslinking of the phases is achieved by heating.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240111108
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  • 6
    Digitale Medien
    Digitale Medien
    Editorial (1989)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 12 (1989), S. 433-433 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240120702
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  • 7
    Digitale Medien
    Digitale Medien
    Chromatographic beauty (1991)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 14 (1991), S. 429-429 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240140702
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  • 8
    Digitale Medien
    Digitale Medien
    HPLC in packed microbore flexible silica capillaries. Part 1: Estimation and minimization of extra-column volumes (1984)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 220-221 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Liquid chromatography, HPLC ; Packed microbore capillaries ; Miniaturization of components ; Estimation of dead volumes ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240070412
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  • 9
    Digitale Medien
    Digitale Medien
    Quantitative gas chromatography using a new automated derivatizer (1985)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 8 (1985), S. 411-414 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography, GC ; Capillary columns ; Automated derivatization ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: In the gas chromatographic analysis of complex biological samples, the most time-consuming and error-prone steps are the pretreatment required for isolation and purification of the compounds of interest and, for most analytes, the derivatization to chemically and thermally stable compounds with high volatility. These wet-chemical steps are usually carried out manually, and for routine analysis of large numbers of samples they are often rate-limiting. A dedicated automated derivatizer has been constructed, the employment of which significantly reduces the time required for manual labor and increases the reproducibility of derivatization and hence the accuracy of analysis.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240080811
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  • 10
    Digitale Medien
    Digitale Medien
    Single derivatives for GC-MS assay of reducing sugars and selective detection by the nitrogen-phosphorus detector (NPD) (1986)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 9 (1986), S. 662-666 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Capillary GC ; GC/MS ; Reducing sugars ; NPD ; Derivatization ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Reduction of sugar methoximes with sodium cyanoborohydride followed by permethylation with CH3SOCH2-/ICH3 affords the corresponding deoxy(methylmethoxylamino)alditol O-methyl ethers, which are amenable to capillary gas chromatography. Derivatization proceeds under mild conditions with high yields. Only a single derivative is formed for each reducing sugar. All aldose derivatives can be separated in a single chromatographic run on glass capillaries coated with Carbowax 20 M or Superox 0.1. Good linearity was found. The introduction of the nitrogen atom in the sugar molecule makes these derivatives suitable for selective detection by the NPD. The El-mass spectra contain intense characteristics ions at m/z 74 for aldoses and at m/z 280 for reducing disaccharides, together with a (M - 15)+ion. These fragments are very suitable for highly sensitive GC-MS analysis by selective single ion monitoring.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240091114
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