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  • Gas chromatography
  • Springer  (32)
  • 1990-1994  (15)
  • 1980-1984  (17)
  • 1970-1974
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  • 1
    Digitale Medien
    Digitale Medien
    Chemically modified teflon capillary columns for gas chromatography II. Solid surface effects in direct coated columns (1982)
    Springer
    Chromatographia 15 (1982), S. 641-644 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Teflon capillary columns ; Chemically modified teflon ; Gas chromatography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary The preparation of teflon capillary columns employing direct coating of the stationary phase to the chemically modified teflon surface and the role of the chemically modified teflon in the separation mechanism are described. Two types of contributions from the modified teflon have been observed: nonspecific adsorption of the carbon surface and specific interactions of polar groups in the carbon skeleton. The use of polar liquid phases can eliminate adsorption due to the presence of polar groups in the modified teflon.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02279491
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  • 2
    Digitale Medien
    Digitale Medien
    GC/MSD detection of the metabolic residues of metolachlor in tomato fruit (1992)
    Springer
    Chromatographia 33 (1992), S. 147-150 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; MS detection ; Metachlor ; Herbicide residues ; Tomatoes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A gas chromatograph/mass selective detector method is presented for the analysis of the major metabolic residues of metolachlor by acid hydrolysis of tomato fruit. The two major hydrolysis products, CGA-37913 (2-[2-ethyl-6-methylphenyl]amino-1-propanol) and derivatised CGA-49751 (4-[2-ethyl-6-methylphenyl]-2-hydroxy-5-methyl-3-morpholinone) were monitored in the selective ion mode atm/z 162 andm/z 160, respectively. Recoveries from 87 to 96% were obtained for tomato fortified at 50 to 200μg kg−1. The proposed method of analysis will allow for a detection limit of 11 μg kg−1 for CGA-37913 and 12 μg kg−1 for the derivatised CGA-49751.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02275895
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  • 3
    Digitale Medien
    Digitale Medien
    Trace determination of amines and other nitrogen containing compounds with a modiefied thermal energy analyzer (TEATM) (1982)
    Springer
    Chromatographia 16 (1982), S. 354-358 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Modified thermal energy analyzer ; Selective detection of nitrogen compounds
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A modification to the TEATM Analyzer is described, which allows it to be used as a highly selective GC detector for nitrogen compounds as well as for N-nitrosamines and nitro compounds. The modified Analyzer is as sensitive as the AFID, but has a much higher selectivity towards nitrogen compounds than the AFID. Its response appears to be molar, with an output that is dependent only on the number of nitrogen atoms present. The performance of the modified Analyzer for the analysis of ammonia, amines,N-nitrosamines, nitriles and organonitro compounds is reported and discussed, as is its application to the detection of these compounds in bacon and beer samples.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02258937
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  • 4
    Digitale Medien
    Digitale Medien
    Ultrastructural and gas-chromatographic analysis of the preputial glands of male nude (nu/nu) mice (1980)
    Springer
    Cell & tissue research 211 (1980), S. 73-82 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Preputial glands ; Nude mice ; Ultrastructure ; Gas chromatography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The preputial glands of male nude (nu/nu) mice were analyzed by a combination of electron microscopy and gas chromatography to determine whether or not they are affected, like developing hairs and nails, by the nu/nu genotype. Results of the analyses revealed no differences between the glands of nude and normal male mice in either their ultrastructural characteristics or lipid secretory products.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00233724
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  • 5
    Digitale Medien
    Digitale Medien
    Chemically modified teflon wall-coated open tubular columns for gas chromatography (1981)
    Springer
    Chromatographia 14 (1981), S. 19-22 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Teflon columns ; Chemically modified teflon ; Gas chromatography ; Capillary columns
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary Wall-coated open tubular columns prepared from chemically modified teflon tubing have been developed for gas chromatography. Chemical reaction of the inner walls of teflon tubing allows bonding of an adhesive layer on which a variety of stationary phaes can be coated. Test mixtures of alkanes and alcohols were used to investigate the chromatographic properties of these columns and the stability and mixing of the adhesive and stationary phae layers. the results in dicate that mixing of the layers is negligible and that the column is stable for a long period of time.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02262057
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  • 6
    Digitale Medien
    Digitale Medien
    Relationship between the average molecular polarizabilities of polycyclic aromatic hydrocarbons and their retention indices determined on various stationary phases (1983)
    Springer
    Chromatographia 17 (1983), S. 300-302 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Average molecular polarizability ; Retention index ; Polycyclic aromatic hydrocarbons
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The Kováts retention indices of 10 polycyclic aromatic hydrocarbons were determined on SE-30, OV-101, SE-52, OV-7 and OV-17 stationary phases. A significant correlation has been found between the retention indices and the average molecular polarizabilities of the analyzed substances. Equations were derived for the direct determination of the average molecular polarizabilities from the retention index values. The influence of the temperature on this relationship is also indicated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02270661
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  • 7
    Digitale Medien
    Digitale Medien
    Analysis of carboxylic acids by gas chromatography. Derivatisation using chloroacetone (1984)
    Springer
    Chromatographia 18 (1984), S. 309-312 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Carboxylic acids ; Acetonyl derivatives
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary The preparation of the acetonyl esters of nine aliphatic carboxylic acids is described, the general formula of the derivatives being RCOOCH2COCH3 where R=alkyl or H. The derivatives show good chromatographic properties on both packed and capillary columns. The electron impact and chemical ionisation mass spectra of the derivatives are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02259083
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  • 8
    Digitale Medien
    Digitale Medien
    A thermodynamic criterion for the identification of the functional group of aliphatic compounds by gas chromatography (1984)
    Springer
    Chromatographia 18 (1984), S. 449-455 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Thermodynamic relationships ; Retention index ; Peak identification
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A thermodynamic criterion, ΔQ, is suggested which permits to estimate the difference in the functional group energy of interactions for two different stationary phases. The linear dependence of ΔQ on the homolog number m of any series Rm X can be used as the thermodynamic criterion for the identification of substances by GC analysis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02262976
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  • 9
    Digitale Medien
    Digitale Medien
    Unified retention indices of alkylbenzenes on OV-101 and SE-30 (1993)
    Springer
    Chromatographia 37 (1993), S. 215-217 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Unified retention indices ; Dimethylsiloxane stationary phases
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary Gas chromatographic, unified retention-indices of 56 alkylbenzenes up to C15 on dimethylsiloxane OV-101 and SE-30 stationary phases are given. These values agree well with the corresponding experimental values used in the statistical treatment of the experimental data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02275863
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  • 10
    Digitale Medien
    Digitale Medien
    Calculation of retention indices and peak widths in temperature programmed gas-liquid chromatography (1993)
    Springer
    Chromatographia 37 (1993), S. 264-270 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Temperature programmed ; Peak widths ; Polynomial interpolation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary Isothermal chromatographic measurements lead directly to ΔH v o and A (entropy term) of solutes, and three constants of an empirical relationship between peak width and column temperature. From the thermodynamic parameters ΔH v o and A retention temperatures have been computed by means of a theoretical model including temperature dependence of carrier gas viscosity, and subsequently retention times; programmed retention indices have been determined by linear and polynomial interpolations. By substituting the value of the calculated retention temperature in the above-mentioned relationship, peak width at half-height for a linear temperature may be estimated. Predicted retentions correlate with observed data, with a P-value ≤0.01; simulation accuracy is generally 6–10% for peak widths. Retention indices of some organochlorine species, separated on an OV-101 capillary column, may differ by as much as 26 units depending on the method of calculation. Polynomial-calculated indices are more consistent with the retention index scheme, and have smaller standard deviations and better constancy at different heating rates.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02278631
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