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  • Column liquid chromatography  (2)
  • poison gland  (2)
  • 1
    Electronic Resource
    Electronic Resource
    3-Ethyl-2,5-dimethylpyrazine, a component of the trail pheromone of the antMessor bouvieri (1989)
    Springer
    Cellular and molecular life sciences 45 (1989), S. 487-489 
    Details
    ISSN: 1420-9071
    Keywords: Messor bouvieri ; Formicidae ; 3-ethyl-2,5-dimethylpyrazine ; trail pheromone ; poison gland ; anabasine ; Dufour gland ; Tapinoma simrothi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 3-Ethyl-2,5-dimethylpyrazine, found in the poison gland of workers, induces trail following in the Mediterranean harvester antMessor bouvieri. The poison gland contains on average 9 ng of this trail pheromone component. The alkaloids anabasine and anabaseine are also present in this gland, but induce no reaction in workers. Trail following is also induced by substances present in the Dufour gland, but the combined effect of both glands shows no synergism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01952041
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Trail pheromone of leaf-cutting antAcromyrmex subterraneus subterraneus (Forel) (1994)
    Springer
    Journal of chemical ecology 20 (1994), S. 1719-1724 
    Details
    ISSN: 1573-1561
    Keywords: Trail pheromone ; Hymenoptera ; Formicidae ; methyl 4-methylpyrrole-2-carboxylate ; poison gland
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The trail pheromone ofAcromyrmex subterraneus subterraneus consists simply of the heterocyclic ester methyl 4-methylpyrrole-2-carboxylate in the venom reservoir of workers at about 1.2 ng/ant. No pyrazines were detected, and no enhancement of trail-following was observed when pyrazines were added to the pyrrole compound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02059893
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Supercritical fluid extraction of bile acids from bovine bile raw materials (1998)
    Springer
    Chromatographia 48 (1998), S. 785-789 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography-mass spectrometry ; Column liquid chromatography ; Supercritical fluid extraction ; Bile acids ; Bovine bile hydrolysates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The use of supercritical fluid extraction (SFE) as an alternative to conventional liquid extraction has been investigated to conventional liquid extraction has been investigated for the isolation of bile acids (cholic acid, deoxycholic acid and chenodeoxycholic acid) from the solid material obtained by bovine bile hydrolysis. Initial studies indicated that bile acids are not soluble in supercritical CO2, consequently the addition of the polar modifier methanol to the CO2 extracting fluid was evaluated. Quantitative recoveries (〉88.5%) were obtained for the bile acids in 20 min with 15% (v/v) methanol in CO2 at 220 atm and 70°C. A comparison of SFE with pyridine extraction was performed on samples of hydrolyzed crude bovine bile. The SFE method yielded recoveries higher than 82.7% compared with conventional liquid extraction. Moreover, SFE minimized sample handling, reduced the consumption of harmful solvents and provided conditions suitable for selective extractions of bile acids from bovine bile raw materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02467648
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    High performance liquid chromatography coupled to nuclear magnetic resonance spectroscopy and mass spectrometry applied to plant products: Identification of ecdysteroids fromSilene otites (1999)
    Springer
    Chromatographia 49 (1999), S. 374-378 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; NMR spectroscopy and mass spectrometry ; Plant products ; Silene otites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary HPLC coupled in parallel to nuclear magnetic resonance (NMR) and mass spectrometry (MS) has been used to obtain1H NMR and mass spectra of a number of ecdysteroids present in an extract of the plantSilene otites. Reversed phase gradient chromatography was performed using a D20-acetonitrile-based solvent system. NMR and mass spectra were obtained for integristerone A, 20-hydroxyecdysone, 2-deoxy-20-hydroxyecdysone and 2-deoxyecdysone to provide structural confirmation using continuous and stopped flow HPLC-NMR. The combined HPLC-NMR-MS system described here provided a more comprehensive analysis of the ecdysteroids present in the extract than HPLC-NMR alone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02467609
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    Paper (German National Licenses)
    Fulltext
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