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  • Gas chromatography  (29)
  • Female
  • Magnetism
  • Springer  (29)
  • 2015-2019
  • 2005-2009
  • 1995-1999  (29)
  • 1
    Electronic Resource
    Electronic Resource
    Determination of acids in Brazilian sugar cane spirits and other alcoholic beverages by HRGC-SPE (1998)
    Springer
    Chromatographia 48 (1998), S. 751-757 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Solid phase extraction ; Brazilian sugar cane spirit ; Lower fatty acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A gas chromatographic method for the analysis of seventeen acids in a water/ethanol matrix is described. The diluted samples were first concentrated by solid phase extraction. Nonanoic acid was the internal standard. A good separation profile was obtained for all compounds, including the isomers: n and iso-butyric acids, n and isovaleric acids and n and iso-caproic acids. The method is fast, sensitive (20–30 μg L−1) and has a good reproducibility (4–7 %). The recovery was in the range of 94%–116% for the medium chain acids (C7-C16). This method allowed the identification of fourteen acids in caninhas and other spirits. The total acid content and the profile of the exportation type caninhas are similar to the ones obtained for several international beverages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02467643
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  • 2
    Electronic Resource
    Electronic Resource
    Enantiomeric separation of unusual secondary aromatic amino acids (1998)
    Springer
    Chromatographia 48 (1998), S. 53-58 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Gas chromatography ; Enantiomeric separation ; Chiral derivatization ; Unusual secondary aromatic amino acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary High-performance liquid chromatographic and gas chromatographic methods were developed for the separation of unusual secondary aromatic amino acids. Amino acids containing 1,2,3,4-tetrahydroisoquinoline, 1,2,3,4-tetrahydronorharmane-1-carboxylic acid and 1,2,3,4-tetrahydro-3-carboxy-2-carboline moieties were synthetized in racemic or chiral forms. The high-performance liquid chromatography was carried out either on a teicoplanin-containing chiral stationary phase or on an achiral C18 column. In the latter case the diastereomers of the amino acids formed by precolumn derivatization with the chiral reagents 2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl isothiocyanate or 1-fluoro-2,4-dinitrophenyl-5-L-alanine amide were separated. The gas chromatographic analyses were based on separation on a Chirasil-L-Val column.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02467516
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  • 3
    Electronic Resource
    Electronic Resource
    The isoprostanes: Unique bioactive products of lipid peroxidation (1998)
    Springer
    Journal of biomedical science 5 (1998), S. 415-420 
    Details
    ISSN: 1423-0127
    Keywords: Isoprostanes ; Oxidative stress ; Lipid peroxidation ; Gas chromatography ; Mass spectrometry ; Human disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The development of a specific, reliable and noninvasive method for measuring oxidative stress in humans is essential for establishing the role of free radicals in human diseases. Currently, accurate techniques to assess oxidant injury in vivo are extremely limited although a number of approaches are being investigated. Of these, the measurement of specific products of nonenzymatic lipid peroxidation, the F2-isoprostanes (F2-IsoPs), appears to be a more accurate marker of oxidative stress in vivo in humans than other available methods. The purpose of this brief review is to acquaint the reader with the IsoPs from a biochemical perspective and to provide information regarding the utility of quantifying these compounds as indicators of oxidant stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02255929
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  • 4
    Electronic Resource
    Electronic Resource
    Adrenal tissue in the male African catfish, Clarias gariepinus: localization and steroid hormone secretion (1995)
    Springer
    Cell & tissue research 280 (1995), S. 653-657 
    Details
    ISSN: 1432-0878
    Keywords: Adrenals ; Morphology ; Steroids ; Gas chromatography ; Mass spectrometry ; Clarias gariepinus (Teleostei)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Interrenal-like tissue in male African catfish is localized in paired organs, situated retroperitoneally anterior of the kidney. Histological and enzyme-histochemical (3β-hydroxysteroid dehydrogenase) reactions were carried out on sections of these organs in order to localize steroid-producing cells. In vitro incubations were carried out to determine the steroidogenic capacity of the interrenal-like tissue. Twenty-one steroids could be identified and quantified in the incubation medium, by means of gas chromatography followed by mass spectrometry. Cortisol, 5α-and 5β-androstanedione and androstenedione together comprised about 80% of the total steroid content. In a previous study, twenty testicular steroids were detected in plasma after castration. In the present investigation we have shown that most of these steroids can be produced by the interrenal-like tissue, which thus can be considered as an extra-testicular source of gonadal steroids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318367
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  • 5
    Electronic Resource
    Electronic Resource
    Adrenal tissue in the male African catfish, Clarias gariepinus: localization and steroid hormone secretion (1995)
    Springer
    Cell & tissue research 280 (1995), S. 653-657 
    Details
    ISSN: 1432-0878
    Keywords: Key words: Adrenals ; Morphology ; Steroids ; Gas chromatography ; Mass spectrometry ; Clarias gariepinus (Teleostei)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Interrenal-like tissue in male African catfish is localized in paired organs, situated retroperitoneally anterior of the kidney. Histological and enzyme-histochemical (3β-hydroxysteroid dehydrogenase) reactions were carried out on sections of these organs in order to localize steroid-producing cells. In vitro incubations were carried out to determine the steroidogenic capacity of the interrenal-like tissue. Twenty-one steroids could be identified and quantified in the incubation medium, by means of gas chromatography followed by mass spectrometry. Cortisol, 5α- and 5β-androstanedione and androstenedione together comprised about 80% of the total steroid content. In a previous study, twenty testicular steroids were detected in plasma after castration. In the present investigation we have shown that most of these steroids can be produced by the interrenal-like tissue, which thus can be considered as an extra-testicular source of gonadal steroids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318367
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  • 6
    Electronic Resource
    Electronic Resource
    Simulation of column efficiency in temperature programmed gas-liquid chromatography (1995)
    Springer
    Chromatographia 41 (1995), S. 37-42 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Temperature programming ; Isothermal measurements ; Column efficiency ; Dead time
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary If the dependence of HETP on temperature is specified under isothermal conditions, it is possible to predict the HETP for programmed temperature elution and subsequently peak width at half-height. This requires knowledge of isothermal retention time at retention temperature, which is computed by means of a model including the variation with temperature of dead time estimated from 3 homologs with carbon number: n, (n+j), (n+jk), where n, j and k are any integers. Predicted and measured peak widths corresponded within 4–9%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02274193
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  • 7
    Electronic Resource
    Electronic Resource
    The stability of selected herbicides preconcentrated from estuarine river waters on solid-phase extraction disks (1996)
    Springer
    Chromatographia 42 (1996), S. 72-76 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Estuarine waters ; Solid-phase extraction ; Triazines, alachlor, metolachlor ; Nitrogen phosphorus detection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The stability of atrazine, simazine, alachlor, metolachlor, and deethylatrazine on C18 Empore disks has been determined. Estuarine water (100 mL) spiked at 3 μg L−1 with the target pesticide mixture was preconcentrated on the disks; the disks were then stored at −20°C, 4°C, and at room temperature for periods up to three months and were analyzed by gas chromatography with nitrogen-phosphorus detection. Complete recovery was observed after storage at −20°C throughout the period of the study. Losses up to maximum of 10% were observed after storage at 4°C. Higher losses (up to 24% for alachlor) occurred only at room temperature; the coefficient of variation for these determinations (8–11%) was also higher than that for the others (3–5%). The stability of the pesticides was dependent on the water matrix, on storage temperature, and on properties such as vapor pressure and water solubility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02271058
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  • 8
    Electronic Resource
    Electronic Resource
    Contribution to the unified retention data of hydrocarbons on squalane (1996)
    Springer
    Chromatographia 42 (1996), S. 660-664 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Unified retention data ; Alkanes, alkenes, naphthenes and aromatics ; Squalane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Gas chromatographic, unified retention data of 120 hydrocarbons including: alkanes, alkenes, alkynes, alkylcycloalkanes, alkylcycloalkenes, aromatics and dienes on squalane stacionary phases are given. These values agree well with the corresponding experimental values used in the statistical treatment of the experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02267698
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  • 9
    Electronic Resource
    Electronic Resource
    Interaction studies of vinychloride with liquid foods by gas chromatography (1998)
    Springer
    Chromatographia 47 (1998), S. 63-71 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Liquid foods ; Food packaging materials ; Vinylchloride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The interaction of vinylchloride (VC) with liquid foods, such as water, olive oil and honey, was studied using the relatively new technique of Reversed-Flow Gas Chromatography (RFGC). The RFGC method permits the calculation of the VC diffusion coefficient in the liquid phase (water, oil and honey) and the determination of the partition coefficient of VC between the liquid and the carrier gas, as well as the determination of the Henry's constant of VC in the liquid food. From the variation of the above parameters with temperature, thermodynamic parameters (free and excess free energies, enthalpies, entropies and activity coefficients) were calculated for the adsorption of VC by liquid foods. These are discussed in comparison with the same parameters calculated from empirical equations or determined experimentally by other techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02466787
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  • 10
    Electronic Resource
    Electronic Resource
    Quantitative analysis of apolar polysiloxane phases in large-bore capillary columns (1998)
    Springer
    Chromatographia 47 (1998), S. 305-308 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Silicone phases ; Film thickness ; Large-bore capillary columns
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A technique is described for determination of the amount of bonded phase in commercial columns. It is adapted to the determination of the real nature and the thickness of a siloxane bonded film. Ten-centimeter samples of column are used. The method is tested for large-bore capillary columns. Applications to kinetic studies are suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02466536
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