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1997 (1)
1983 (1)
1Author    H. Schildknecht, B. Weber, K. DettnerRequires cookie*
 Title    Über Arthropodenabwehrstoffe, LXV Die Chemische Ökologie des Grundschwimmers Laccophilus minutus On Arthropode Defensive Compounds, LXV The Chemical Ecology of the Water Beetle Laccophilus minutus  
 Abstract    According to a GC-MS analysis of methylated extracts the abdominal tips of the water beetle Laccophilus minutus (Dytiscidae) contain four ß-hydroxyalkanoic acids. On the basis of MS and GC data another compound was assigned the structure of 6-octenoic acid. The same /S-hydroxyalkanoic acids, and in addition, traces of ^-hydroxyheptanoic acids were identified in dissected pygidial defensive glands after trimethylsilylation. Methyl 3,4-dihydroxyphenylacetate was recognized as a further main component in the pygidial gland secretion from the mass spectrum of its TMSi ether. The Laccophilinae occupy unique position among all the dytiscide subfamilies because they are the only water beetles which store yS-hydroxyalkanoic acids in their pygidial glands. On the other hand the dytiscides appear to form a monophyletic group which is supported by the occurrence of methyl 3,4-dihydroxyphenylacetate. This class of compound is also commonly encountered in the other dytiscide subfamilies. 
  Reference    Z. Naturforsch. 38b, 1678—1685 (1983); eingegangen am 7. Juli 1983 
  Published    1983 
  Keywords    Arthropode Defensive Compounds, ß-Hydroxyalkanoic Acids, Methyl 3, 4-dihydroxyphenylacetate, GC-MS, Chemical Ecology 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1678.pdf 
 Identifier    ZNB-1983-38b-1678 
 Volume    38 
2Author    Z. NaturforschRequires cookie*
 Title      
 Abstract    A ssem El-Shazlya c, A n d reas Teic, L udger W itteb, M äher E l-D om iatya and M ichael W inkc a D epartm ent The alkaloid composition of H yoscyam us boveanus, H. desertorum, H. muticus and H. albus was investigated by capillary GLC and GLC-mass spectrometry. Altogether 39 alka­ loids of the tropane and pyrrolidine types were identified. Several alkaloids were found in the different species for the first time, e.g., 22 alkaloids in H. boveanus, 13 in H. desertorum, 24 in H. muticus and 4 in H. albus. 3ß-Hyoscyamine, dehydrohyoscyamine, phyllalbine, 3a-phenylacetyltropane, phenylacetylscopine as well as phygrine and 2,3-diacetonyl-N-methyl-pyrrolidine are apparently new for the genus Hyoscyamus. Alkaloid profiles and alkaloid contents of flowers, fruits, leaves, stems and roots were determined and their chemoecological functions discussed. 
  Reference    Z. Naturforsch. 52c, 729—739 (1997); received August 15/September 11 1997 
  Published    1997 
  Keywords    Tropane Alkaloids, Capillary GLC, GLC-Mass Spectrometry, Solanaceae, Hyoscyamus, Chemical Ecology 
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 TEI-XML for    default:Reihe_C/52/ZNC-1997-52c-0729.pdf 
 Identifier    ZNC-1997-52c-0729 
 Volume    52